WO1996025522A1 - Process for refining raw sugar - Google Patents
Process for refining raw sugar Download PDFInfo
- Publication number
- WO1996025522A1 WO1996025522A1 PCT/AU1996/000079 AU9600079W WO9625522A1 WO 1996025522 A1 WO1996025522 A1 WO 1996025522A1 AU 9600079 W AU9600079 W AU 9600079W WO 9625522 A1 WO9625522 A1 WO 9625522A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- sugar
- liquor
- melter
- produce
- low colour
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C13—SUGAR INDUSTRY
- C13B—PRODUCTION OF SUCROSE; APPARATUS SPECIALLY ADAPTED THEREFOR
- C13B30/00—Crystallisation; Crystallising apparatus; Separating crystals from mother liquors ; Evaporating or boiling sugar juice
- C13B30/04—Separating crystals from mother liquor
- C13B30/14—Dissolving or refining raw sugar
Definitions
- the present invention relates to a method for milling sugar cane to produce raw sugar and to refining raw sugar to produce refined white sugar.
- Raw sugar is produced by milling sugar cane and is, of necessity, done in close proximity to the fields in which the sugar cane is grown.
- the raw sugar includes soluble and insoluble impurities which are normally removed by a process called refining which is usually carried out in a sugar refinery.
- refining Conventional sugar refining processes are normally, though not necessarily, carried out close to consumer markets and often at great distances from the sugar mill in which the raw sugar was produced.
- the process conventionally used for sugar refining involves dissolution of the washed raw sugar to produce a melter liquor.
- the melter liquor is then limed and subjected to a process of carbonatation or phosphatation in which calcium carbonate or calcium phosphate, respectively, is caused to be precipitated and the precipitate is filtered from the liquor in the case of carbonatation and skimmed from the liquor after aeration in the case of phosphatation. Substantially all of the suspended particulate material in the melter liquor is removed with the precipitate during filtration. This procedure, which is generally referred to as clarification, results in a straw coloured clear liquor.
- the clear liquor is subjected to decolorisation, typically by being passed through a column containing an adsorbent material such as bone charcoal, resins or granular carbon.
- decolorisation process results in a fine liquor from which white sugar is crystallised in vacuum pans.
- the resulting suspension of crystals in syrup is separated in centrifugals and the sugar is then dried to produce free flowing white crystal sugar.
- White sugar should have a turbidity value of approximately 5 or less be satisfactory in commercial markets.
- Experience with a variety of raw sugars has shown that the process described in Australian Patent Specification 84859/91 could not consistently meet this specification.
- the present invention consists in a process for refining raw sugar comprising the steps of:
- step (f) filtering the fine liquor to remove any foreign particles which may ha contaminated the sugar produced in step (d);
- the invention further consists in refined sugar produced by the proc according to the present invention.
- the present inventio consists in a process for producing a very low colour (VLC) intermediate sugar by the steps (a) to (d) defined above and to the very low colour (VLC immediate sugar produced thereby.
- the present invention consists in a process for producing a refined sugar by refining a veiy low colour (VLC) intermediate sugar using the steps (e) to (g) defined above and to the refined sugar produced thereby.
- the step of clarifying the melter liquor is preferably achieved by phosphatation or carbonatation.
- the process of phosphatation involves reacting in the sugar solution lime and phosphoric acid.
- the precipitate formed is removed by aerating the solution and skimming the particulate material from the surface of the solution.
- the process of carbonatation involves reacting in the sugar solution lime and carbon dioxide.
- the precipitate is removed from the solution by filtration.
- sugar refining has been carried out close to the place of sugar consumption because the cost of transporting a food grade product is more expensive than transporting raw sugar which can be carried in bulk without the hygiene constraints attached to handling white sugar.
- Sugar refining is capital intensive and compared with sugar milling has high energy costs and high waste disposal costs. Because energy for sugar milling is derived from bagasse, the fibrous residue of sugar cane, it is a fu that is virtually free and would otherwise be a waste product which would be difficult to dispose of. Since sugar mills are located close to the cane farms supplying them, disposal of phosphatation waste as fertiliser for can growing is much less expensive than the disposal of this waste in a city environment.
- the sugar refinery would then complete the process involving filtrati and crystallising white sugar.
- the dissolved VLC sugar after filtration and concentration adjustment could be sold as liquid sugar to those customers who traditionally buy fine liquor.
- a sugar refinery using this VLC feedstock would be a low capital, low operating cost factory compared with a conventional refinery.
- the station eliminated include clarification by either carbonatation or phosphatation.
- the clarification step is carried out by phosphatation because this is the most cost effective in terms of capital equipment employed and chemicals consumed. It has the additional advantage that the residue from phosphatation may be usefully used as a fertiliser in sugar cane fields when the process is carried out at a sugar mil close to the fields. In contrast if the process were carried out at a city located refinery there would be substantial costs in disposing of the waste the municipal sewer system. Carbonatation may also be used as the clarification step as it has also been found to adsorb the dissolved material which contributes to the turbidity in the refined sugar. The carrying out o the clarification step prior to the crystallisation of the VLC sugar also has the advantage that it has less colour development on storage.
- the VLC sugar produced by the process according to this invention may be used for direct consumption where a product of mill white specification is called for.
- the product will be better than conventional mill white sugars as it has less colour and lower turbidity.
- Fig. 1 is a block diagram showing a simplified application of the process according to the present invention.
- FIGS. 2 and 3 are block diagrams showing a more detailed application of the process according to the present invention. Best Mode for Carrying out the Invention
- the melter liquor 7 is subjected to carbonatation or phosphatation in reactor 14. Lime and carbon dioxide, or lime, phosphoric acid and a flocculant, are also added to the reactor 14 as depicted by line 15. The resultant precipitate is removed by filtration or flotation as the case may be.
- the clarified melter liquor 37 is crystallized in a vacuum pan 2 to produce a mixture 8 of crystallized sugar and syrup.
- the crystals 10 are separated from the syrup 9 in a separating device 3 such as a centrifugal.
- the separated crystalline sugar 10 is redissolved in water, or another aqueous liquid in a further melter 4 to produce fine liquor 11 which may contain foreign particles which can be removed by filtration.
- a small amount of a filter aid 12 is added to the fine liquor 11 and, if desired, powdered carbon and/or powdered ion exchange resin may also be added. then the fine liquor 11 is filtered in a filter 5 to produce a fine liquor 13 fr which refined sugar may be crystallized in conventional crystallization steps.
- the raw sugar 6 used in the process depicted in Figs. 2 and 3 prefera has a polarisation in excess of 99.20°Z and will be dissolved in a melter 1 using water or sweetwater 23 to a concentration of approximately 67°Bx at around 80°C.
- the melter liquor 7 produced from this step is then clarified a reactor 14 using the processes of phosphatation or carbonatation. Since phosphatation is the most cost effective process, this is the preferred meth of clarification.
- Lime 15, phosphoric acid 27 and a polyelectrolyte floccul 28 are added to the reactor 14 being fed with melter liquor 7.
- the calciu phosphate scums 29 with the entrained impurities from the melter liquor are removed at the top of the reactor 14 by flotation through the introducti of fine air bubbles 30 at the bottom of the reactor 14.
- the phosphatation scums 29 are desweetened during the sugar mill's crushing season by including the scums 29 in the primary mud feed of the mill's rotary vacuu filter 31.
- phosphatation scums 29 are conveniently desweetened by mixing them with water 32 and refloating th precipitated material in two reactors 33 and 34 before disposal as phospha rich material 35 which can be used as a fertiliser.
- the sweetwater 36 produced in this washing process can be re-used for dissolving raw sugar i the melter 1.
- the clarified melter liquor 37 is boiled in three strikes in vacuum pans 2, 2a and 2b to produce a suspension of crystals and syrups 8, 8a and 8b which are each respectively separated in centrifugals 3, 3a and 3b using a small quantity of wash water 38 to produce sugar of the desired quality.
- the sugar from the first and second strikes is used as very low colour intermediate sugar 10 while that from the third strike 39 is used to provide seed for raw sugar strikes in the sugar mill.
- the use of third strike very low colour intermediate sugar as seed improves the quality of raw sugar compared with the conventional use of third strike. C crystals, which are remelted and sent to the mill's syrup tank.
- the wet very low colour intermediate sugar 10 is dried in a sugar drier 40 to a moisture content less than 0.1%, preferably about 0.08%. and is ready for transportation to the refinery.
- the very low colour intermediate sugar 10a is dissolved using water or sweetwater 23 in a melter
- a fine liquor 11 which is then filtered in a filter 5 using a diatomaceous earth filter aid 12 (see figure 3).
- powdered carbon 42 or powdered ion exchange resin 43 may be added to the fine liquor before feeding it through a filter 5.
- the filtered fine liquor 13 is then used as liquid sugar or as a feedstock for boiling white sugar in vacuum pans in a conventional manner.
- melter liquor was boiled in a vacuum pan to produce a suspension of crystals and syrup which was then separated in a centrifugal using a small quantity of wash water to produce sugar of a quality suitable for dissolution to fine liquor.
- Cloudy fine liquor was produced by dissolving this sugar in water.
- a small quantity of diatomaceous earth was added to the cloudy fine liquor.
- the cloudy fine liquor was filtered to produce fine liquor.
- This fine liquor was crystallized in a vacuum pan in a manner similar to that normally employed in a sugar refinery for boiling white sugar.
- melter liquor prepared above was clarified using a phosphatation process comprising the addition of phosphoric acid, milk of lime, and a polyelectrolyte.
- the precipitated scu was removed by aeration and the resulting clarified melter liquor was boile in a vacuum pan to produce a suspension of crystals and syrup similar to that described above. After centrifugation this sugar was dissolved and filtered with diatomaceous earth to give fine liquor from which white sugar was boiled.
- processes 2 and 3 which both included a clarification step, resulted in a white sugar having lower and. accordingly, superior colour values.
- the clarification step removes some colourants which affect the whiteness of the white sugar product.
- the white sugar produced by process 2 is. however, surprisingly greatly superior to that produced by process 3 with the turbidity value of the white sugar of process 2 being approximately half that of the white sugar produced by process 3.
- Process 2 also has the significant commercial advantage that the clarification step can be carried out in a sugar mill prior to the VLC sugar being transported to a sugar refinery. This provides an opportunity to dispose of the clarification waste at a lower cost and also provides an off ⁇ season use for sugar mills which otherwise typically lie idle and unproductive after the milling season. It will be appreciated by persons skilled in the art that numerous variations and/or modifications may be made to the invention as shown in the specific embodiments without departing from the spirit or scope of the invention as broadly described. The present embodiments are. therefore, t be considered in all respects as illustrative and not restrictive.
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8524530A JPH11500005A (en) | 1995-02-16 | 1996-02-15 | Crude sugar purification process |
NZ300885A NZ300885A (en) | 1995-02-16 | 1996-02-15 | Refining raw sugar - melter liquor is clarified before being crystallised to produce low colour sugar and syrup |
US08/894,769 US5902408A (en) | 1995-02-16 | 1996-02-15 | Process for refining raw sugar |
AU46160/96A AU688197B2 (en) | 1995-02-16 | 1996-02-15 | Process for refining raw sugar |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AUPN1180A AUPN118095A0 (en) | 1995-02-16 | 1995-02-16 | Improved process for the refining of sugar |
AUPN1180 | 1995-02-16 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1996025522A1 true WO1996025522A1 (en) | 1996-08-22 |
Family
ID=3785538
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/AU1996/000079 WO1996025522A1 (en) | 1995-02-16 | 1996-02-15 | Process for refining raw sugar |
Country Status (7)
Country | Link |
---|---|
US (1) | US5902408A (en) |
JP (1) | JPH11500005A (en) |
AU (1) | AUPN118095A0 (en) |
CA (1) | CA2212809A1 (en) |
NZ (1) | NZ300885A (en) |
WO (1) | WO1996025522A1 (en) |
ZA (1) | ZA961206B (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2001797A2 (en) | 2006-03-15 | 2008-12-17 | Reaction Science, INC. | Method for making silicon for solar cells and other applications |
WO2013082018A1 (en) * | 2011-12-02 | 2013-06-06 | Amal Gamated Research Llc | System and process for refining sugar |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6406547B1 (en) | 2000-07-18 | 2002-06-18 | Tate & Lyle Industries, Limited | Sugar beet membrane filtration process |
US6440222B1 (en) * | 2000-07-18 | 2002-08-27 | Tate & Lyle Industries, Limited | Sugar beet membrane filtration process |
US6406548B1 (en) | 2000-07-18 | 2002-06-18 | Tate & Lyle Industries, Limited | Sugar cane membrane filtration process |
US6174378B1 (en) | 1999-08-19 | 2001-01-16 | Tate Life Industries, Limited | Process for production of extra low color cane sugar |
US6375751B2 (en) | 1999-08-19 | 2002-04-23 | Tate & Lyle, Inc. | Process for production of purified cane juice for sugar manufacture |
US6387186B1 (en) | 1999-08-19 | 2002-05-14 | Tate & Lyle, Inc. | Process for production of purified beet juice for sugar manufacture |
US6355110B1 (en) | 1999-11-17 | 2002-03-12 | Tate & Lyle Industries, Limited | Process for purification of low grade sugar syrups using nanofiltration |
US6887381B2 (en) * | 2001-10-11 | 2005-05-03 | Honeywell International, Inc. | Filter apparatus for removing sulfur-containing compounds from liquid fuels, and methods of using same |
JP3769734B2 (en) * | 2003-04-07 | 2006-04-26 | アサヒビール株式会社 | Process for producing sugar and useful substances |
CA3097027A1 (en) * | 2018-05-08 | 2019-11-14 | Sucro Can Sourcing Llc | Production of white sugars and high-quality liquid sugars |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5281279A (en) * | 1991-11-04 | 1994-01-25 | Gil Enrique G | Process for producing refined sugar from raw juices |
AU6755194A (en) * | 1993-07-19 | 1995-01-27 | Applexion | Process for refining a raw sugar, particularly raw sugar from the sugar cane industry |
AU7776394A (en) * | 1993-11-12 | 1995-05-18 | Applexion | Process of manufacturing crystal sugar from an aqueous sugar juice such as cane juice or sugar beet juice |
AU2279595A (en) * | 1994-04-07 | 1995-10-30 | International Food Processing, Incorporated | Process for producing sugar directly from sugarcane |
-
1995
- 1995-02-16 AU AUPN1180A patent/AUPN118095A0/en not_active Abandoned
-
1996
- 1996-02-15 WO PCT/AU1996/000079 patent/WO1996025522A1/en not_active Application Discontinuation
- 1996-02-15 CA CA002212809A patent/CA2212809A1/en not_active Abandoned
- 1996-02-15 NZ NZ300885A patent/NZ300885A/en unknown
- 1996-02-15 US US08/894,769 patent/US5902408A/en not_active Expired - Fee Related
- 1996-02-15 JP JP8524530A patent/JPH11500005A/en active Pending
- 1996-02-15 ZA ZA961206A patent/ZA961206B/en unknown
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5281279A (en) * | 1991-11-04 | 1994-01-25 | Gil Enrique G | Process for producing refined sugar from raw juices |
AU6755194A (en) * | 1993-07-19 | 1995-01-27 | Applexion | Process for refining a raw sugar, particularly raw sugar from the sugar cane industry |
AU7776394A (en) * | 1993-11-12 | 1995-05-18 | Applexion | Process of manufacturing crystal sugar from an aqueous sugar juice such as cane juice or sugar beet juice |
AU2279595A (en) * | 1994-04-07 | 1995-10-30 | International Food Processing, Incorporated | Process for producing sugar directly from sugarcane |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2001797A2 (en) | 2006-03-15 | 2008-12-17 | Reaction Science, INC. | Method for making silicon for solar cells and other applications |
US7922989B2 (en) | 2006-03-15 | 2011-04-12 | Amendola Steven C | Method for making silicon for solar cells and other applications |
US8568683B2 (en) | 2006-03-15 | 2013-10-29 | Steven C. Amendola | Method for making silicon for solar cells and other applications |
WO2013082018A1 (en) * | 2011-12-02 | 2013-06-06 | Amal Gamated Research Llc | System and process for refining sugar |
US9080221B2 (en) | 2011-12-02 | 2015-07-14 | Amalgamated Research Llc | System and process for refining sugar |
AU2012346140B2 (en) * | 2011-12-02 | 2017-04-27 | Amalgamated Research Llc | System and process for refining sugar |
Also Published As
Publication number | Publication date |
---|---|
JPH11500005A (en) | 1999-01-06 |
AUPN118095A0 (en) | 1995-03-09 |
ZA961206B (en) | 1996-09-05 |
NZ300885A (en) | 1998-01-26 |
CA2212809A1 (en) | 1996-08-22 |
US5902408A (en) | 1999-05-11 |
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