CA2361235C - Process for producing anionic clay using boehmite - Google Patents

Process for producing anionic clay using boehmite Download PDF

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CA2361235C
CA2361235C CA002361235A CA2361235A CA2361235C CA 2361235 C CA2361235 C CA 2361235C CA 002361235 A CA002361235 A CA 002361235A CA 2361235 A CA2361235 A CA 2361235A CA 2361235 C CA2361235 C CA 2361235C
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boehmite
anionic clay
anionic
process according
water
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CA2361235A1 (en
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Dennis Stamires
Mike Brady
William Jones
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Akzo Nobel NV
Albemarle Netherlands BV
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Akzo Nobel NV
Albemarle Netherlands BV
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J23/00Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/007Mixed salts
    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01FCOMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F7/00Compounds of aluminium
    • C01F7/02Aluminium oxide; Aluminium hydroxide; Aluminates
    • C01F7/16Preparation of alkaline-earth metal aluminates or magnesium aluminates; Aluminium oxide or hydroxide therefrom
    • C01F7/162Magnesium aluminates
    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01FCOMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F7/00Compounds of aluminium
    • C01F7/78Compounds containing aluminium and two or more other elements, with the exception of oxygen and hydrogen
    • C01F7/784Layered double hydroxide, e.g. comprising nitrate, sulfate or carbonate ions as intercalating anions
    • C01F7/785Hydrotalcite
    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01PINDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2002/00Crystal-structural characteristics
    • C01P2002/20Two-dimensional structures
    • C01P2002/22Two-dimensional structures layered hydroxide-type, e.g. of the hydrotalcite-type
    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01PINDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2002/00Crystal-structural characteristics
    • C01P2002/70Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data
    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01PINDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00Particle morphology
    • C01P2004/30Particle morphology extending in three dimensions
    • C01P2004/32Spheres

Abstract

This patent describes economical and environment-friendly processes for the synthesis of anionic clays. It involves reacting a slurry comprising boehmite with a magnesium source. There is no necessity to wash o r filter the product. It can be spray dried directly to form microspheres or can be extruded to form shaped bodies. The product can be combined with other ingredients in the manufacture of catalysts, absorbents, pharmaceuticals, cosmetics, detergents, and other commodity products that contain anionic clays.

Description

PROCESS FOR PRODUCING ANIONIC CLAY USING BOEHMITE

BACKGROUND OF THE INVENTION

This invention involves the preparation of anionic clays and the preparation of Mg-Al solid solutions by heat-treatment of the anionic clay. Anionic clays have a crystal structure which consists of positively charged layers built up of specific combinations of metal hydroxides between which there are anions and water molecules. Hydrotalcite is an example of a naturally occurring anionic clay, in which carbonate is the predominant anion present. Meixnerite is an anionic clay wherein OH- is the predominant anion present.

In hydrotalcite-like anionic clays the brucite-like main layers are built up of octahedra alternating with interlayers in which water molecules and anions, more particularly carbonate ions, are distributed. The interlayers contain anions such as NO3 , OH, Cl , Br , l, S042 , S1032 , Cr042 , B032, Mn04 , HGaO32 , HVO,z C104 , B03 2 , pillaring anions such as V,oO28~ and M0,0246 , monocarboxylates such as acetate, dicarboxylates such as oxalate, alkyl sulphonates such as laurylsulphonate.

It should be noted that a variety of terms is used to describe the material which is referred to in this patent as an anionic clay. Hydrotalcite-like and layered double hydroxide are interchangeably used by those skilled in the art. In this patent application we refer to the materials as anionic clays, comprising within that term hydrotalcite-like and layered double hydroxide materials.

The preparation of anionic clays has been described in many prior art publications.
Recently, two major reviews of anionic clay chemistry were published in which the synthesis methods available for anionic clay synthesis have been summarized, F. Cavani et al "Hydrotalcite-type anionic clays: Preparation, Properties and Applications," Catalysis Today" , 11 (1991) Elsevier Science Publishers B. V. Amsterdam.
J P Besse and others "Anionic clays:trends in pillary chemistry, its synthesis and microporous solids" (1992), 2, 108, editors: M.I. Occelli, H.E. Robson, Van Nostrand Reinhold, N.Y.

In these reviews the authors state that a characteristic of anionic clays is that mild calcination at 500 C results in the formation of a disordered MgO-Iike product. Said disordered MgO-Iike product is distinguishable from spinel (which results upon severe calcination) and from anionic clays. In this patent application we refer to said disordered MgO-Iike materials as Mg-Al solid solutions. Furthermore, these Mg-Al solid solitions contain a well-known memory effect whereby the exposure to water of such calcined materials results in the reformation of the anionic clay structure.

For work on anionic clays, reference is given to the following articles:
Helv. Chim. Acta, 25, 106-137 and 555-569 (1942) J. Am. Ceram. Soc., 42, no. 3, 121 (1959) Chemistry Letters (Japan), 843 (1973) Clays and Clay Minerals, 23, 369 (1975) Clays and Clay Minerals, 28, 50 (1980) Clays and Clay Minerals, 34, 507 (1996) Materials Chemistry and Physics, 14, 569 (1986).
In addition there is an extensive amount of patent literature on the use of anionic clays and processes for their preparation.

European Patent Application 0 536 879 describes a method for introducing pH-dependent anions into the clay. The clay is prepared by the addition of a solution of AI(N03)3 and Mg(N03)2 to a basic solution containing borate anions.
The product is then filtered, washed repeatedly with water, and dried overnight.
Additionally mixtures of Zn/Mg are used.

In US 3,796,792 by Miyata et al. entitled "Composite Metal Hydroxides" a range of materials is prepared into which an extensive range of cations is incorporated, including Sc, La, Th, In, etc. In the examples given solutions of the divalent and trivalent cations are prepared and mixed with base to cause co-precipitation. The resulting products are filtered, washed with water, and dried at 80 C. Example 1 refers to Mg and Sb and Example 3 to Mg and Bi.
Other examples are given, and in each case soluble salts are used to make solutions prior to precipitation of the anionic clay at high pH.

In US 3,879,523 by Miyata entitled "Composite Metal Hydroxides" also a large number of preparation examples is outlined. The underlying chemistry, however, is again based on the co-precipitation of soluble salts followed by washing and drying. It is important to emphasize that washing is a necessary part of such preparations, because to create a basic environment for co-precipitation of the metal ions a basic solution is needed and this is provided by NaOH/Na2CO3 solutions. Residual sodium, for example, can have a significant deleterious effect on the subsequent performance of the product as a catalyst or oxide support.

In US 3879525 (Miyata) very similar procedures are again described.
In US 4,351,814 to Miyata et al. a method for making fibrous hydrotalcites is described. Such materials differ in structure from the normal plate-like morphology. The synthesis again involves soluble salts. For example, an aqueous solution of a mixture of MgCl2 and CaCi2 is prepared and suitably aged. From this a needle-like product Mg2(OH)3C1.4H20 precipitates. A separate solution of sodium aluminate is then reacted in an autoclave with the solid Mg2(OH)3C1.4Hz0 and the product is again filtered, washed with water, and dried.

In US 4,458,026 to Reichle, in which heat-treated anionic clays are described as catalysts for aidol condensation reactions, again use is made of magnesium and aluminium nitrate salt solutions. Such solutions being added to a second solution of NaOH and Na2CO3. After precipitation the slurry is filtered and washed twice with distilled water before drying at 125 C.
In US 4,656,156 to Misra the preparation of a novel absorbent based on mixing activated alumina and hydrotalcite is described. The hydrotalcite is made by reacting activated MgO (prepared by activating a magnesium compound such as magnesium carbonate or magnesium hydroxide) with aqueous soiutions containing aluminate, carbonate and hydroxyl ions. As an example the solution is made from NaOH, Na2CO3 and A1203. In particular, the synthesis involves the use of industrial Bayer liquor as the source of Al. The resulting products are washed and filtered before drying at 105 C.

In US 4,904,457 to Misra a method is described for producing hydrotalcites in high yield by reacting activated magnesia with an aqueous solution containing aluminate, carbonate, and hydroxyl ions.

The methodology is repeated in US 4,656,156.
In US 5,507,980 to Kelkar et at al. a process is described for making novel catalysts, catalyst supports, and absorbers comprising synthetic hydrotalcite-like binders. The synthesis of the typical sheet hydrotalcite involves reacting pseudo-boehmite to which acetic acid has been added to peptize the pseudo-boehmite. This is then mixed with magnesia. More importantly, the patent summary states clearly that the invention uses mono carboxylic organic acids such as formic, propionic and isobutyric acid. In this patent the conventional approaches to preparing hydrotalcites are presented.
5 In US 5,439,861 a process is disclosed for preparing a catalysts for synthesis gas production based on hydrotalcites. The method of preparation is again based, on the co-precipitation of soluble salts by mixing with base, for example, by the addition of a solution of RhCl31 Mg(N03)2 and AI(N03)3 to a solution of Na2CO3 and NaOH.
Also in US 5,399,537 to Bhattacharyya in the preparation of nickel-containing catalysts based on hydrotalcite use is made of the co-precipitation of soluble magnesium and aluminium salts.

In US 5,591,418 to Bhattacharyya a catalyst for removing sulphur oxides or nitrogen oxides from a gaseous mixture is made by calcining an anionic clay, said anionic clay having been prepared by co-precipitation of a solution of Mg(N03)2, AI(N03)3 and Ce(N03)3. The product again is filtered and repeatedly washed with de-ionized water.
In US 5,114,898/WO 9110505 Pinnavaia et al. describe layered double hydroxide sorbents for the removal of sulphur oxide(s) from flue gases, which layered double hydroxide is prepared by reacting a solution of Al and Mg nitrates or chlorides with a solution of NAOH and Na2C03. In US 5,079,203 /WO 9118670 layered double hydroxides intercalated with polyoxo anions are described, with the parent clay being made by co-precipitation techniques.

In US 5,578,286 in the name of Alcoa a process for the preparation of meixnerite is described. Said meixnerite may be contacted with a dicarboxylate or polycarboxylate anion to form a hydrotalcite-like material. In examples 5-6 hydromagnesite is contacted with pseudoboehmite under high COz pressure to obtain hydrotalcite.

In US 4,946,581 and US 4,952,382 to van Broekhoven co-precipitation of soluble salts such as Mg(N03)2 and AI(N03)3 with, and without the incorporation of rare earth salts was used for the preparation of anionic clays as catalyst components and additives. A variety of anions and di- and tri-valent cations are described.

As indicated in the description of the prior art given-above, there are many applications of anionic clays.
These include but are not restricted to: catalysts, adsorbents, drilling muds, catalyst supports and carriers, extenders and applications in the medical field.
In particular van Broekhoven has described their use in SOX abatement chemistry.

Because of this wide variety of large-scale commercial applications for these materials, new processes utilizing alternative inexpensive raw materials are needed to provide a more cost-effective and environmentally compatible processes for making anionic clays. In particular, from the prior art described above one can conclude that the preparation process can be improved in the following ways: the use of cheaper sources of reactants, processes for easier handling of the reactants, so that there is no need for washing or filtration, eliminating the filtration problems associated with these fine-particled materials, the avoidance of alkali metals (which can be particularly disadvantageous for certain catalytic applications): In prior art preparations, organic acids were used to peptize alumina. The use of organic acids is expensive and introduces an additional step in the synthesis process and is therefore not cost-effective.
Further, in drying or calcining the anionic clay prepared by prior art processes gaseous emissions of nitrogen oxides, halogens, sulphur oxides, etc. are 7a In accordance with one aspect of the present invention, there is provided a process for the preparation of anionic clays wherein a slurry consisting of (i) water, (ii) boehmite, and (iii) MgO, Mg(OH)2, and/or MgCO3 is reacted to obtain an anionic ciay.

In accordance with another aspect of the present invention, there is provided a process for the preparation of a composition containing anionic clay and boehmite wherein a slurry consisting of (i) water, (ii) excess boehmite, and (iii) MgO, Mg(OH)2, and/or MgCO3 is reacted to obtain a composition comprising anionic clay and boehmite.

In accordance with still another aspect of the present invention, there is provided a process for the preparation of a composition containing anionic clay and a magnesium compound wherein a slurry consisting of (i) water, (ii) boehmite, and (iii) excess MgO, Mg(OH)2, and/or MgCO3 is reacted to obtain a composition comprising anionic clay and a magnesium compound.

BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1(a) shows a PXRD pattern of commercially available Catapal .
Figure 1(b) shows a PXRD pattern of commercially available P3 alumina.
Figure 1(c) shows a PXRD pattern of commercially available Laroche .

alumina.
Figure 2. shows a PXRD pattern of a commercially available anionic clay.
Figure 3 shows a PXRD pattern of a Mg-Al carbonate anionic clay prepared by coprecipitation.
Figure 4 shows a PXRD pattern of an anionic clay prepared by the process according to the invention, wherein Catapal and MgO are reacted Figure 5 shows a PXRD pattern of an anionic clay prepared by the process according to the invention, wherein MgO and Catapal are reacted.
Figure 6 shows a PXRD pattern of an anionic clay prepared by the process according to the invention, wherein MgO and Laroche alumina are reacted.
Figure 7 shows a PXRD pattern of an anionic clay prepared by the process according to the invention, wherein MgO and P3 alumina are reacted.
Figure 8 shows a PXRD pattern of an anionic clay prepared by the process according to the invention, wherein MgO and P3 alumina are reacted.

DETAILED DESCRIPTION OF THE INVENTION

This invention invoives the preparation of anionic clays. In particular it describes a process for the preparation of an anionic clay by reacting a slurry comprising boehmite and a magnesium source not being hydromagnesite. Hydromagnesite is a carbonate-containing Mg-source which is expensive and not readily available. Further, hydromagnesite appears to be less reactive for the present process than the magnesium sources of the present invention. Said magnesium source may be composed of a solution of a magnesium salt, a solid magnesium-bearing compound or a mixture of the two. Reaction between the Mg source and boehmite results in the direct formation of an anionic clay.
Said reaction takes place at room temperature or higher. At temperatures higher than 100 C, the reaction is preferably carried out under autogeneous conditions. In the method according to the invention carbonate, hydroxyl, or other anions or mixtures thereof, either provided within the reaction medium for example as a soluble salt or absorbed during the synthesis from the atmosphere, are incorporated into the interlayer region as the necessary charge-balancing anion.
Anionic clays prepared by this method exhibit the well known properties and characteristics (e.g. chemical analysis, powder X-ray diffraction pattern, FTIR, thermal decomposition characteristics, surface area, pore volume, and pore size distribution) usually associated with anionic clays prepared by the customary and previously disclosed methods.

Upon being heated, anionic clays generally form Mg-Al solid solutions, and at higher temperatures, spinels. When used as a catalyst, an adsorbent (for instance a SOX adsorbent for catalytic cracking reactions), or a catalyst support, the anionic clay according to the invention is usually heated during preparation and is thus in the Mg-Al solid solution form. During use in an FCC unit, the catalyst or adsorbent is converted from an anionic clay into Mg-AI solid solutions .

Therefore, the present invention is also directed to a process wherein an anionic clay prepared by the reaction according to the invention, is heat-treated at a temperature between 300 and 1200 C to form a Mg-Al-containing solid solution and/or spinel.

The anionic clay according to the invention has a layered structure corresponding to the general formula [M9m2+ Ain3+ (OH)2m+2n=] Xn/ZZ .bH2O

Wherein m and n have a value such that m/n=l to 10, preferably 1 to 6, and b has a value in the range of from 0 to 10, generally a value of 2 to 6 and often a value of about 4. X may be C03Z-, OH- or any other anion normally present in the interlayers of anionic clays. It is more preferred that m/n should have a value of 2 to 4, more particularly a value close to 3.

Since the process disclosed in this patent does not require washing of the product or filtering, there is no filtrate waste or gaseous emissions (e.g.
from acid decomposition), making the process particularly environmental-friendly and more suited to the environmental constraints which are increasingly imposed on 10 commercial operations. The product can be spray dried directly to form microspheres or can be extruded to form shaped bodies.

Alumina source The present invention includes the use of boehmite. This includes both boehmites and pseudoboehmites such as Vista Catapal A , Condea Dispersal P3 , Condea P200 , Laroche Versal 250 etcetera. In particular we emphasize that there is no need to peptize the boehmite. However it is permitted to peptize the boehmite with inorganic acids. These types of acids are not expensive and the use of inorganic acids renders the process still cost-effective. Our invention embodies the use of mixtures of boehmites and pseudoboehmites. Also the use of boehmites in mixture with other aluminium sources such as oxides and hydroxides of aluminium, (e.g. sols, aluminium trihydrate, and its thermally treated forms, flash calcined aluminium trihydrate), aluminium salts such as aluminium nitrate, aluminium chloride, aluminium chlorohydrate amorphous gel aluminas and sodium aluminate, is envisaged.
Said other aluminium sources may be soluble or insoluble in water. Said different aluminium sources may be combined in any sequence in a slurry before and/or after the Mg source is added.

Magnesium source Mg-bearing sources which may be used include MgO, Mg(OH)2, magnesium acetate, magnesium formate, magnesium hydroxy acetate, magnesium carbonate, magnesium bicarbonate, magnesium nitrate, magnesium chloride, dolomite, sepiolite. Preferred Mg sources are MgO, Mg(OH)2, and MgCO3, because they are cheap, readily available and reactive in the reaction of the present invention. Both solid Mg sources and soluble Mg salts are suitable.
Also combinations of Mg sources may be used.
Conditions All that is required is simple mixing of the Mg source and the boehmite in an aqueous suspension in air with stirring at ambient or at elevated temperature at atmospheric or elevated pressure. Usually, a temperature between 0 and 100 C is used at or above atmospheric pressure. It is preferred to carry out the process at temperatures above 50 C rather than at room temperature, because this results in anionic clays with sharper peaks in the x-ray diffraction pattern.than anionic clays obtained at room temperature. It is possible to purge the slurry with nitrogen or inert gas if an anionic clay with predominantly hydroxide anions are desired, but in general this is not necessary. Thus, the reaction can be conducted in the presence of CO2. Said CO2 may be the COZ
normally present in air or it may be added to the reaction from an outside source.
Said aqueous suspension may be obtained by either combining slurries of the starting materials or adding magnesium source to a slurry of boehmite or vice versa. Given particular facilities which might be available, the method is suitable to use in hydrothermal processing (e.g. in an autoclave at temperatures above 100 C and increased pressures). This is particularly advantageous, because it this is faster and a higher conversion is obtained. There is no need to wash or filter the product, as unwanted ions (e.g. sodium, ammonium, chloride, sulphate) which are frequently encountered when using other preparation methods, are absent in the product.
In a further embodiment of the invention, the process is conducted in a two-step process, e.g. a slurry of boehmite and Mg source is treated thermally at a mild temperature, followed by a hydrothermal treatment. If desired a preformed anionic clay may be added to the reaction mixture. Said preformed clay may be recycled anionic clay from the reaction mixture or anionic clay made separately by the process according to the invention or any other process.

Because of its simplicity, this process can be carried out in a continuous mode by mixing of a first slurry comprising boehmite and a second slurry comprising magnesium source passing the mixed slurry through a reactor vessel which can operate below 100 C and under atmospheric pressure or above 100 C under autogenous conditions. Said first and/or second slurry may be subjected to a treatment prior to mixing the slurries.

As mentioned-above, if desired inorganic acids and bases, for example for control of the pH, may be added to the slurry before or during reaction or to the individual reactants before combining them in the slurry.

If desired, the anionic clay prepared by the process according to the invention may be subjected to ion exchange. Upon ion exchange the interlayer charge-balancing anions are replaced with other anions. Said other anions are the ones commonly present in anionic clays and include pillaring anions such as V10O28-6, Mo7Oz46-. Said ion exchange can be conducted before drying or after the anionic clay formed in the slurry.

The process of the invention provides wide flexibility in preparing products with a wide range of Mg:AI ratios. The Mg:AI ratio can vary from 0.1 to 10 preferably from 1 to 6, more preferred from 2 to 4, and especially preferred to close to 3.

If an excess of boehmite is used a composition is prepared which contains anionic clay and also unreacted boehmite. In said composition the anionic clay and boehmite are intimately mixed, rather than present as separate phases such as in physically mixed mixtures of anionic clay and boehmite. Said composition appears to be highly suitable for use as an additive or as a matrix for catalysts for hydrocarbon conversion. This composition appears especially suitable for sulphur removal from the gasoline and diesel fraction in FCC, SOX
and NOX removal in FCC, and as a metal trap. The present invention is also directed to a composition containing anionic clay and boehmite. Said composition is obtainabie by the process of the invention in which only part of the boehmite is reacted with magnesium source to obtain anionic clay. The rest of the boehmite remains unreacted in the composition.

On the other hand, also magnesium sources may also be used in excess to obtain a composition containing anionic clay and a magnesium compound, ususally in the form of an oxide or hydroxide. It is even possible to prepare compositions containing anionic clay, boehmite and a magnesium compound with the process according to the invention by controlling the process conditions. In said compositions the anionic clay, magnesium compound, and optionally boehmite are intimately mixed, rather than present as separate phases such as in physically mixed mixtures of anionic clay, magnesium compound and boehmite. These compositions appear to be highly suitable for use as an additive or as a matrix for catalysts for hydrocarbon conversion.
These compositions appear to be especially suitable for use as a metal trap in FCC.

For some applications it is desirable to have additives, both metals and non-metals, such as rare earth metals, Si, P, B, group VI, group VIII, alkaline earth (for instance Ca and Ba) and/or transition metals (for example Mn, Fe, Ti, Zr, Cu, Ni, Zn, Mo, Sn), present. Said metals can easily be deposited on the anionic clay, the solid solution according to the invention, the composition containing boehmite and anionic clay or the composition containing anionic clay, magnesium source and optionally boehmite. They can also be added either to the alumina or magnesia source or to the slurry during preparation of the anionic clay.
The present invention is illustrated by the following examples which are not to be considered limitative by any means.

EXAMPLES

COMPARATIVE EXAMPLES BASED ON THE STATE OF THE ART

Comparative example 1 a A PXRD pattern was made of Vista Catapal A . (Figure 1(a)).
10 Comparative Example 1 b A PXRD pattern was made of Condea Dispersal P3 alumina. (Figure 1(b)) Comparative Example 1 c A PXRD pattern was made for Laroche Versal 250 . (Figure 1(c)).
Comparative Example 2 A commercially avialable sample of anionic clay was obtained from Reheis Corporation . Its PXRD pattern is shown in Figure 2.

Comparative Example 3 This comparative example illustrates the co-precipitation method where Mg and Al salt solutions are added to a solution of base. (US 3 979 523 Assignee Kyowa Chemical Industry, Japan) A solution containing 0.04 M Of AI(NO3)2.9H2Oand 0.08 M Of Mg(NO3)2.6H2O in 100 ml distilled water was added dropwise and with vigorous stirring to 150 ml of distilled water containing 0.05 M of Na2CO3 at room temperature. Mg/Al ratio of 2Ø The pH was maintained close to 10 by the addition of 3N NAOH and the resulting slurry aged overnight at room temperature. The precipitate was separated by centrifuge, washed several times with hot distilled water then dried at 65 C overnight.

The PXRD pattern obtained from this sample is shown in Figure 3. The results were:

d(A) 7.84 3.90 2.56 Thermogravimetric analysis showed three weight losses: at approximately 100, 250 and 450 C which are ascribed to loss of physisorbed water, interlayer water and loss of CO2 and lattice dehydroxylation.

EXAMPLES ACCORDING TO THE INVENTION

The following examples illustrate the use of Vista Catapal A , Laroche Versal 250 ,Condea P200 and Condea Disperal P3 .

Example 4 A slurry comprising 3.92 g of MgO was made in 50 ml water at 65 C. 1.80 g Vista Catapal A was added . The mixture was kept with stirring at 65 C for 18 hours and then dried for 18 hours at 65 C (Figure 4).
Example 5 A slurry of alumina was prepared by adding 13.53 g of an aluminium pseudoboehmite (Vista Catapal A ) in 53 g water (blended for 15 minutes) to a mixture of 18.24 g MgO in 19 g water ( Mg:Al ratio 2.3). The resulting mixture was mixed in a blender for 15 minutes. The final pH was 9.96. The slurry was aged in a closed container at 85 C for 48 hours. The product was dried in an oven at 100 C. (Figure 5) Example 6 A slurry comprising 3.92 g of MgO was made in 50 ml water at 65 C. 1.80 g Laroche Versal 250 was added. The mixture was kept with stirring at 65 C
for 18 hours and then dried for 18 hours at 65 C (Figure 6) Example 7 A slurry comprising 3.92 g of MgO was made in 50 mi water at 65 C. 1.8 g Condea Dispersal P3 was added . The mixture was kept with stirring at 65 C
for 18 hours and then dried for 18 hours at 65 C (Figure 7) Example 8 A slurry of alumina was prepared by adding 43.86 g of an aluminium pseudoboehmite (Condea Dispersal P3 ) in 32 g water ( blended for 15 minutes) to a mixture of 27.28 g MgO in 28 g water (Mg:Al ratio 2.3). The resulting mixture was mixed in a blender for 15 minutes. The final pH was 9.17.
The slurry was aged in a closed container at 85 C for 48 hours. The product was dried in an oven at 100 C (Figure 8) Example 9 A slurry comprising 3.92 g of MgO was made in 50 mi water at 65 C. 1.8 g Condea P200 was added . The mixture was kept with stirring at 65 C for 18 hours and then dried for 18 hours at 65 C.

Example 10 A slurry comprising 3.92 g of MgO was made in 50 ml of water at 65 C. 1.8 g Condea Dispersal P3 was added. The mixture was heated in an autoclave at 185 C for 4 hours and the product was dried for 18 hours at 65 C.

Example 11 Example 8 was repeated with the addition of 6 wt% of Ce added to the reaction mixture prior to the treatment for 18 hours at 65 C.

Example 12 Example 10 was repeated with the addition of 3 wt% V added to the reaction mixture prior to the treatment at 185 C for 4 hours.

Example 13 Example 10 was repeated with the addition of 6 wt% Ce added to the reaction mixture prior to the treatment at 185 C for 4 hours.

Example 14 Example 8 was repeated with the addition of 6 wt% of Ce as well as 3wt% of V
added to the reaction mixture prior to the treatment for 18 hours at 65 C.

Example 15 Example 14 was repeated with substitution of the treatment for 18 hours at 65 C by a treatement at 185 C for 4 hours.

Claims (12)

Claims:
1. A process for the preparation of anionic clays wherein a slurry consisting of (i) water, (ii) boehmite, and (iii) MgO, Mg(OH)2, and/or MgCO3 is reacted to obtain an anionic clay.
2. A process according to claim 1 wherein the boehmite is pseudoboehmite.
3. A process according to claim 1 or 2 wherein the reaction takes place at a temperature between 0 and 100 °C at or above atmospheric pressure.
4. A process according to any one of claims 1-3 wherein the reaction takes place at a temperature above 50 °C at or above atmospheric pressure.
5. A process according to any one of claims 1-4 wherein the reaction is conducted at a temperature above 100 °C and increased pressure.
6. A process according to any one of claims 1-5 wherein a first slurry consisting of (i) water and (ii) boehmite is combined with a second slurry consisting of (i) water and (ii) MgO, Mg(OH)2, and/or MgCO3.
7. A process according to claim 6 wherein the process is carried out in a continuous mode.
8. A process according to any one of claims 1-7 wherein the anionic clay is subjected to an ion-exchange treatment.
9. A process according to claim 8 wherein the anionic clay is ion exchanged with pillaring anions such as V10O28 6- and Mo7O24 6-.
10. Process according to any one of claims 1-9 wherein metals or non-metals are deposited on the anionic clay.
11. A process for the preparation of a composition containing anionic clay and boehmite wherein a slurry consisting of (i) water, (ii) excess boehmite, and (iii) MgO, Mg(OH)2, and/or MgCO3 is reacted to obtain a composition comprising anionic clay and boehmite.
12. A process for the preparation of a composition containing anionic clay and a magnesium compound wherein a slurry consisting of (i) water, (ii) boehmite, and (iii) excess MgO, Mg(OH)2, and/or MgCO3 is reacted to obtain a composition comprising anionic clay and a magnesium compound.
CA002361235A 1999-01-29 2000-01-27 Process for producing anionic clay using boehmite Expired - Lifetime CA2361235C (en)

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DE60021353D1 (en) 2005-08-25
JP4629874B2 (en) 2011-02-09
WO2000044671A1 (en) 2000-08-03
EP1152981A1 (en) 2001-11-14
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