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Publication numberUS3756794 A
Publication typeGrant
Publication dateSep 4, 1973
Filing dateJul 16, 1969
Priority dateJul 22, 1968
Also published asDE1937000A1, DE1937000B2, DE1937000C3
Publication numberUS 3756794 A, US 3756794A, US-A-3756794, US3756794 A, US3756794A
InventorsFord P
Original AssigneeShell Oil Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Emulsified hydrocarbon fuels
US 3756794 A
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Description  (OCR text may contain errors)

3,756,794 EMULSIFIED HYDROCARBON FUELS Peter '1. Ford, Chester, England, assignor to Shell Oil Company, New York, N.Y.

No Drawing. Filed July 16, 1969, Ser. No. 842,399 Claims priority, application Great Britain, July 22, 1968, 34,755/ 68 Int. Cl. C10] 1/32 U.S. Cl. 44-51 6 Claims ABSTRACT OF THE DISCLOSURE Emulsified fuel compositions comprising a hydrocarbon fuel as the disperse phase, an emulsifier, water and urea or formamide as an emulsion stabilizer have improved flow and dernulsification characteristics.

This invention relates to emulsified hydrocarbon fuels. More particularly it relates to emulsified hydrocarbon fuels containing a unique water soluble non-ash forming emulsion stabilizer.

A hydrocarbon fuel or its vapor can burn in an uncontrolled manner and therefore is extremely dangerous if it escapes, for example, from a leaking fuel tank. Such a tank can be a fuel tank of an aircraft, a car, a truck or a ship. In order to reduce this hazard, it is possible to decrease the flow and vaporization rate of a hydrocarbon fuel by emulsifying it with water employing a suitable emulsifying agent. Such an emulsion must have good emulsion stability properties and must also be capable of being pumped at low temperatures, for example -29 C.

It has now been found that an emulsified fuel composition consisting essentially of a hydrocarbon fuel as the disperse phase, an emulsifier, water and urea or formamide as an emulsion stabilizer, has good flow properties and demulsification characteristics. The improved properties of the present compositions are attributed in large part to the presence of the Water soluble non-ash forming emulsion stabilizer, i.e., urea or formamide, which unexpectedly have been found to be highly efficacious in imparting stability to the emulsions of the invention. While formamide is less effective than urea, it is still better than many known stabilizers (see Example 11). The stabilizer can be employed in concentrations of from 0.3% to 10% by weight, preferably from 0.3% to by weight, more preferably from 0.3% to 0.7% by weight.

Hydrocarbon fuels which can be used in the present compositions are those suitable for engines of aircraft (for example, jet or turbojet engines), cars (for example, gasoline engines) or trucks or ships (for example, diesel engines). The fuel thus includes diesel, gasoline and kerosene type distillate fuels boiling within the range 20- 400 C. The hydrocarbon fuel component of the composition forms more than 75%, preferably more than 90% and more preferable more than 95% of the total composition by weight. A preferred maximum concentration of the hydrocarbon is 98.5%.

An excessively high proportion of water cannot be incorporated in the fuel. The water may conveniently be present in the range 0.75% to 12% by weight of the total composition, but amounts in the range 0.75% to 3% are preferred.

A wide range of emulsifiers can be employed in the present compositions. An emulsifier or emulsifier mixture 3,756,794 Patented Sept. 4, 1973 having an HLB of 11-16 (see p. 19, I. See. Cosmetic Chemists, December 1948) is preferred.

An example of a very suitable emulsifier is a condensate of an alkylphenol and an alkyleneoxide. The mole ratio of alkyleneoxide to alkylphenol can be 5:1 to 15:1. Examples of the alkylphenol are C alkylphenols, especially octylphenol, nonylphenol or dodecylphenol. Examples of the alkyleneoxide are ethyleneoxide and propyleneoxide. A particularly advantageous emulsifier is a condensate of an octylphenol and ethyleneoxide, for example, one sold under the trade mark Nonidet P or Triton X-l02. The emulsifier can be employed in concentrations of 0.3% to 5% by weight, preferably 0.5% to 1.5%, although an upper limit of 10% is practicable.

In addition to the foregoing, the emulsified fuels of the invention can also contain a water soluble non-ash forming freezing point depressant. Compounds suitable for this purpose include ammonium salts (for example, ammonium nitrate) or polyols (for example, ethylene glycol or glycerol). Ammonium nitrate has been found to be particularly advantageous in the present compositions. The proportion of depressant may be 0.1% to 10% by weight but preferably is from 0.3% to 0.7%. An emulsified fuel comprising both urea and ammonium nitrate in the preferred proportions shows particularly surprising stability.

Supplementary additives can also be present. Examples of these are anticorrosion additives and antistatic additives. Anticorrosion additives may be required particularly in view of the presence of water in the composition of the invention. Trace quantities of, for example, ethylene diamine, have been found useful in reducing corrosion of iron. Glycerol and ethylene glycol are other examples of anticorrosion agents. Proprietary anticorrosion additives such as Lubrizol 541 (dodecenyl succinic acid) may also be employed in appropriate quantities. The amount of anticorrosion agent will usually be up to 1.0% by Weight.

The invention is illustrated by the following example:

EXAMPLE An emulsified hydrocarbon fuel according to the invention (Emulsion I) had the following composition:

Percent weight/volume A second emulsified hydrocarbon fuel (Emulsion II) according to the invention had the following composition:

Percent weight/ volume Aviation turbine quality fuel 96.8 Nonidet P80 0.8

Water 1.0 Urea 0.4 Ammonium nitrate 0.4 Ethylene glycol 0.4 Lubrizol 541 (dodecenyl succinic acid) 0.2

Properties of the above emulsions are given in Table I, which also contains test results relating to the properties of reference emulsions A, D and E prepared in accordance with the invention, and B, C, F, G and H not in accordance with the invention.

Emulsion A: Percent weight/volume Aviation turbine quality fuel 97.0 Nonidet P80 1.0 Water 1.3 Urea 0.6

Emulsion B: Percent weight/volume Aviation turbine quality fuel 97.0 Nonidet P80 1.0 Water 1.0 Ammonium nitrate 1.0

Emulsion Percent weight/volume Aviation turbine quality fuel 97.0 Nonidet P80 1.0 Water 1.5 Ammonium chloride 0.5

Emulsion D: Percent weight/volume Aviation turbine quality fuel 97.0 Triton X102 (octylphenol-ethyleneoxide condensate) 1.0 Water 1.0 Urea 1.0

Emulsion E: Percent weight/volume Aviation turbine quality fuel 97.0 Triton X-102 1.0 Water 1.5 Urea 0.5

Emulsion F: Percent weight/volume Aviation turbine quality fuel 97.0 Triton X-102 1.0 Water 1.0 Acetamide 1.0

Emulsion G: Percent weight/volume Aviation turbine quality fuel 97.0 Triton X-102 1.0 Water 1.5 Ammonium chloride 0.5

Emulsion H: Percent weight/volume Aviation turbine quality fuel 97.0 Triton X-102 1.0 Water 2.0

The above compositions were made up on a percent weight/volume basis, the hydrocarbon and water being measured by volume and the other components by weight.

TABLE I.-EMULSION STABILITY Exposure to Storage air at ambient Freezing Emulsions temperature --29 C. 15 C. 55 C.

I Stable 1 Stable Stable Stable. II do. do. ..d0. Do. A Separated slowlyJ; Separated B Separated 4 Stable C do. do. D Stable 1 Separated E do. (10. F Separated rapidly. Stable B G Separated 4 do? H do. Separated 3 1 Longer than 30 days.

2 After 5 cycles of cooling from ambient temperature to 29 0. maintaining the emulsion at that temperature for a period of time and than allowing it to warm-up to ambient temperature again.

3 After one cycle.

4 Bulk fuel visible at surface Within 2 to 4 hours.

EXAMPLE II To demonstrate the superiority of urea and formamide over known emulsion stabilizers, a series of emulsion compositions were prepared and tested for emulsion stability. Each of the emulsions comprised of 97% vol. aviation turbine fuel, 1% vol. water, 1% vol. Nonidet P80, 0.5% wt. ammonium nitrate together with one of the stabilizers set out in Table II.

I claim as my invention:

1. An emulsified fuel composition consisting essentially of (1) a major amount of a hydrocarbon fuel boiling in the range of 20400 C. as the disperse phase, (2) 0.3% to 5% by weight of an emulsifier, (3) 0.75% to 12% by weight water, (4) 0.3% to 0.7% by weight of urea as emulsion stabilizer and (5) 0.3% to 0.7% by weight of ammonium nitrate.

2. The composition of claim 1 wherein the hydrocarbon fuel is present in an amount of more than by weight.

3. The composition of claim 2 wherein water is present in the amount of 0.75 to 3% by weight.

4. The composition of claim 1 wherein the emulsifier is a condensate of a C alkyl phenol and C alkyleneoxide.

5. The composition of claim 4 wherein the emulsifier is a condensation product of octylphenol and ethyleneoxide.

6. The composition of claim 2 wherein the hydrocarbon fuel is present in an amount of more than by weight.

References Cited UNITED STATES PATENTS 3,458,294 7/1969 Nixon et al 445l 2,716,068 8/ 1955 Fair et a1. 252-70 3,613,372 10/1971 Lissaut 4451 DANIEL E. WYMAN, Primary Examiner Y. H. SMITH, Assistant Examiner US. Cl. X.R. 447l; 252312

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4410334 *Oct 30, 1981Oct 18, 1983Parkinson Harold BHydrocarbon fuel composition
US4725287 *Nov 24, 1986Feb 16, 1988Canadian Occidental Petroleum, Ltd.Mixing with ethoxylated alkyl phenols
US4732576 *Jul 11, 1986Mar 22, 1988Huels AktiengesellschaftCationic emulsifiers
US4743273 *Aug 15, 1986May 10, 1988Union Oil Company Of CaliforniaAmide and ketone, antideposit agents
US4844717 *Apr 22, 1988Jul 4, 1989Union Oil Company Of CaliforniaKetone and amide
US4978365 *Oct 27, 1987Dec 18, 1990Canadian Occidental Petroleum Ltd.Ethoxylated alkylphenol emulsifying agents
US5156652 *Dec 13, 1989Oct 20, 1992Canadian Occidental Petroleum Ltd.Low-temperature pipeline emulsion transportation enhancement
US5746783 *Nov 8, 1995May 5, 1998Martin Marietta Energy Systems, Inc.Low emissions diesel fuel
US6280485Sep 7, 1999Aug 28, 2001The Lubrizol CorporationEmulsified water-blended fuel compositions
US6368366Jul 7, 1999Apr 9, 2002The Lubrizol CorporationProcess and apparatus for making aqueous hydrocarbon fuel compositions, and aqueous hydrocarbon fuel composition
US6368367Sep 7, 1999Apr 9, 2002The Lubrizol CorporationEmulsions; mixture containing fuel additive
US6383237Jan 14, 2000May 7, 2002Deborah A. LangerProcess and apparatus for making aqueous hydrocarbon fuel compositions, and aqueous hydrocarbon fuel compositions
US6419714 *Jan 16, 2001Jul 16, 2002The Lubrizol CorporationCrosslinking
US6530964Dec 6, 2000Mar 11, 2003The Lubrizol CorporationContinuous process for making an aqueous hydrocarbon fuel
US6606856Apr 24, 2000Aug 19, 2003The Lubrizol CorporationOxidation of water-diesel fuel emulsion using catalyst in form of flow-through cellular monolith
US6648929Sep 14, 1998Nov 18, 2003The Lubrizol CorporationEmulsified water-blended fuel compositions
US6652607Dec 6, 2000Nov 25, 2003The Lubrizol CorporationConcentrated emulsion for making an aqueous hydrocarbon fuel
US6725653Jun 6, 2003Apr 27, 2004The Lubrizol CorporationSuch as a filter; water-diesel fuel-emulsifier
US6827749Oct 15, 2001Dec 7, 2004The Lubrizol CorporationContinuous process for making an aqueous hydrocarbon fuel emulsions
US6858046Feb 5, 2002Feb 22, 2005The Lubrizol CorporationLiquid fuel, water, an emulsifier, and an amine salt which may function as an emulsion stabilizer or combustion modifier
US6913630Jun 26, 2001Jul 5, 2005The Lubrizol CorporationAmino alkylphenol emulsifiers for an aqueous hydrocarbon fuel
US6949235Jun 9, 2003Sep 27, 2005The Lubrizol CorporationReducing the level of pollutants in the exhaust of an engine, comprising: operating the engine using as the fuel a water fuel emulsion; and contacting the exhaust gas from the engine with an oxidation catalysts
US7028468Apr 7, 2003Apr 18, 2006The Lubrizol CorporationProcess for reducing pollutants from the exhaust of a diesel engine
US7100367 *Aug 6, 2003Sep 5, 2006Robert Bosch GmbhDevice for exhaust gas treatment of a combustion system
US7279017Feb 21, 2003Oct 9, 2007Colt Engineering CorporationMethod for converting heavy oil residuum to a useful fuel
US7341102Apr 28, 2005Mar 11, 2008Diamond Qc Technologies Inc.Flue gas injection for heavy oil recovery
US7413583Aug 22, 2003Aug 19, 2008The Lubrizol CorporationReducing emissions like particles
US7645305 *Jul 1, 1998Jan 12, 2010Clean Fuels Technology, Inc.High stability fuel compositions
US7770640Feb 6, 2007Aug 10, 2010Diamond Qc Technologies Inc.Carbon dioxide enriched flue gas injection for hydrocarbon recovery
US8511259 *Mar 28, 2002Aug 20, 2013Cam Technologie S.P.A.Method for reducing emission of pollutants from an internal combusion engine, and fuel emulsion comprising water and a liquid hydrocarbon
USRE36983 *May 23, 1995Dec 12, 2000Petroferm Inc.Pre-atomized fuels and process for producing same
EP0725892A1 *Aug 29, 1994Aug 14, 1996Platinum Plus, Inc.The reduction of nitrogen oxides emissions from diesel engines
WO2000015740A1 *Sep 7, 1999Mar 23, 2000Lubrizol CorpWater fuel emulsified compositions
Classifications
U.S. Classification44/301, 44/458, 516/69
International ClassificationC10L1/32
Cooperative ClassificationC10L1/328
European ClassificationC10L1/32D