Classifications

• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
  • C10L10/00—Use of additives to fuels or fires for particular purposes
  • C10L10/08—Use of additives to fuels or fires for particular purposes for improving lubricity; for reducing wear
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
  • C10L1/00—Liquid carbonaceous fuels
  • C10L1/10—Liquid carbonaceous fuels containing additives
  • C10L1/14—Organic compounds
  • C10L1/18—Organic compounds containing oxygen
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
  • C10L1/00—Liquid carbonaceous fuels
  • C10L1/10—Liquid carbonaceous fuels containing additives
  • C10L1/14—Organic compounds
  • C10L1/18—Organic compounds containing oxygen
  • C10L1/19—Esters ester radical containing compounds; ester ethers; carbonic acid esters
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
  • C10L1/00—Liquid carbonaceous fuels
  • C10L1/10—Liquid carbonaceous fuels containing additives
  • C10L1/14—Organic compounds
  • C10L1/18—Organic compounds containing oxygen
  • C10L1/19—Esters ester radical containing compounds; ester ethers; carbonic acid esters
  • C10L1/1905—Esters ester radical containing compounds; ester ethers; carbonic acid esters of di- or polycarboxylic acids
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
  • C10L1/00—Liquid carbonaceous fuels
  • C10L1/10—Liquid carbonaceous fuels containing additives
  • C10L1/14—Organic compounds
  • C10L1/18—Organic compounds containing oxygen
  • C10L1/19—Esters ester radical containing compounds; ester ethers; carbonic acid esters
  • C10L1/191—Esters ester radical containing compounds; ester ethers; carbonic acid esters of di- or polyhydroxyalcohols

Definitions

• This invention relates to fuel compositions useful, for example, to improve lubricity and reduce wear in diesel engines.
• esters as additives for diesel engine fuel.
• US-A-2,527,889 describes polyhydroxy alcohol esters as primary anti-corrosion additives in diesel engine fuel
• GB-A-1,505,302 describes ester combinations including, for example, glycerol monoesters and glycerol diesters as diesel fuel additives, the combinations being described as leading to advantages including less wear of the fuel-injection equipment, piston rings and cylinder liners.
• GB-A-1,505,302 is, however, concerned with overcoming the operational disadvantages of corrosion and wear by acidic combustion products, residues in the combustion chamber and in the exhaust system.
• the document states that these disadvantages are due to incomplete combustion under certain operating conditions.
• Typical diesel fuels available at the date of the document contained, for example, from 0.5 to 1% by weight of sulphur, as elemental sulphur, based on the weight of the fuel.
• the sulphur content of diesel fuels has now been or will be lowered in a number of countries for environmental reasons, i.e. to reduce sulphur dioxide emissions.
• heating oil and diesel fuel sulphur content are being harmonised by the CEC at a maximum of 0.2% by weight, and, at a second stage, the maximum content in diesel fuel will be 0.05% by weight. Complete conversion to the 0.05% maximum may be required during 1996.
• the process for preparing low sulphur content fuels in addition to reducing sulphur content, also reduces the content of other components of the fuel such as polyaromatic components and polar components. Reducing one or more of the sulphur, polyaromatic and polar component content of the fuel creates a new problem in use of the fuel, i.e. the ability of the fuel to lubricate the injection system of the engine is reduced such that, for example, the fuel injection pump of the engine can fail relatively early in the life of an engine, failure being, eg. in high pressure fuel injection systems such as high pressure rotary distributors, in-line pumps and unit injectors and injectors. Such severe failures are due to wear that is completely different from the corrosive wear problem described in GB-A-1,505,302.
• FR-A-1 405 551 describes jet fuels containing a lubricity-improving mixture of poly carboxylic acids or esters thereof and partial esters of a polyhydric alcohol.
• DE-A-1 594 417 describes a lubricity additive comprising an ester being the reaction product between a dicarboxylic acid and an oil insoluble glycol.
• a first aspect of the invention is a fuel oil composition
• a fuel oil composition comprising a major proportion of a diesel fuel oil having a sulphur concentration of 0.2% by weight or less, and a minor proportion of an additive comprising an ester of a carboxylic acid and an alcohol wherein the acid has from 2 to 50 carbon atoms and the alcohol has one or more carbon atoms, provided that:
• a second aspect of the invention is the use of a fuel oil composition as defined in the first aspect of the invention as the fuel in a compression-ignition (diesel) engine for controlling wear rate in the injection system of the engine in operation of the engine.
• a compression-ignition (diesel) engine for controlling wear rate in the injection system of the engine in operation of the engine.
• a third aspect of the invention is a method of operating a compression-ignition (diesel) engine comprising providing a fuel oil composition as defined in the first aspect of the invention as the fuel in the engine thereby to control wear rate in the injection system of the engine.
• a compression-ignition (diesel) engine comprising providing a fuel oil composition as defined in the first aspect of the invention as the fuel in the engine thereby to control wear rate in the injection system of the engine.
• the additive in use of the composition in a compression-ignition internal combustion engine, is capable of forming over the range of operating conditions of the engine, at least partial mono- or multi-molecular layers of the additive on surfaces of the injection system, particularly the injector pump that are in moving contact with one another, the composition being such as to give rise, when compared with a composition lacking the additive, to one or more of a reduction in wear, a reduction in friction, or an increase in electrical contact resistance in any test where two or more loaded bodies are in relative motion under non-hydrodynamic lubricating conditions.
• the additive which may be a single additive or mixture of additives, is capable of forming at least partial layers on certain surfaces of the engine.
• the layer formed is not necessarily complete on the contacting surface. Thus, it may cover only part of the area of that contacting surface, for example 10% or more, or 50% or more.
• the formation of such layers and the extent of their coverage of a contacting surface can be demonstrated by, for example, measuring electrical contact resistance or electrical capacitance.
• tests that can be used to demonstrate one or more of a reduction in wear, a reduction in friction or an increase in electrical contact resistance according to this invention are the Ball On Cylinder Lubricant Evaluator and High Frequency Reciprocating Rig tests which will be referred to hereinafter.
• the acid from which the ester is derived may be a mono or polycarboxylic acid such as aliphatic, saturated or unsaturated, straight or branched chain, mono and dicarboxylic acids being preferred.
• the acid may be generalised in the formula R'(COOH) x where x represents an integer and is 1 or more such as 1 to 4, and R' represents a hydrocarbyl group having from 2 to 50 carbon atoms and which is mono or polyvalent corresponding to the value of x, the -COOH groups, when more than one is present, optionally being substituent on different carbon atoms from one another.
• 'Hydrocarbyl means a group containing carbon and hydrogen which group is connected to the rest of the molecule via a carbon atom. It may be straight or branched chain which chain may be interrupted by one or more hetero atoms such as O, S, N or P, may be saturated or unsaturated, may be aliphatic or alicyclic or aromatic including heterocyclic, or may be substituted or unsubstituted.
• the hydrocarbyl group is an alkyl group or an alkenyl group having 10 (e.g. 12) to 30 carbon atoms, i.e. the acid is saturated or unsaturated.
• the alkenyl group may have one or more double bonds, such as 1, 2 or 3.
• saturated carboxylic acids are those with 10 to 22 carbon atoms such as capric, lauric, myristic, palmitic, and behenic acids and examples of unsaturated carboxylic acids are those with 10 to 22 carbon atoms such as oleic, elaidic, palmitoleic, petroselic, riconoleic, eleostearic, linoleic, linolenic, eicosanoic, galoleic, erucic and hypogeic acids.
• the acid is polycarboxylic, having for example from 2 to 4 carboxy groups
• the hydrocarbyl group is preferably a substituted or unsubstituted polymethylene.
• the alcohol from which the ester is derived may be a mono or polyhydroxy alcohol such as a trihydroxy alcohol.
• the alcohol may be generalised in the formula R 2 (OH) y where y represents an integer and is 1 or more and R 2 represents a hydrocarbyl group having 1 or more carbon atoms such as up to 10 carbon atoms, and which is mono or polyvalent corresponding to the value of y, the -OH groups, when more than one is present, optionally being substituent on different carbon atoms from one another.
• the hydrocarbyl group is preferably an alkyl group or a substituted or unsubstituted polymethylene group.
• monohydric alcohols are lower alkyl alcohols having from 1 to 6 carbon atoms such as methyl, ethyl, propyl and butyl alcohols.
• polyhydric alcohols are aliphatic, saturated or unsaturated, straight chain or branched alcohols having 2 to 10, preferably 2 to 6, more preferably 2 to 4, hydroxy groups, and having 2 to 90, preferably 2 to 30, more preferably 2 to 12, most preferably 2 to 5, carbon atoms in the molecule.
• the polyhydric alcohol may be a glycol or diol, or a trihydric alcohol such as glycerol.
• the esters may be used alone or as mixtures of one or more esters and may be composed only of carbon, hydrogen and oxygen.
• the ester has a molecular weight of 200 or greater, or has at least 10 carbon atoms, or has both.
• esters examples include lower alkyl esters, such as methyl esters, of the above exemplified saturated or unsaturated monocarboxylic acids. Such esters may, for example, be obtained by saponification and esterification of natural fats and oils of plant or animal origin or by their transesterification with lower aliphatic alcohols.
• esters of polyhydric alcohols that may be used are those where all of the hydroxy groups are esterified, those where not all of the hydroxy groups are esterified, and mixtures thereof.
• Specific examples are esters prepared from trihydric alcohols and one or more of the above-mentioned saturated or unsaturated carboxylic acids, such as glycerol monoesters and glycerol diesters, e.g. glycerol monooleate, glycerol dioleate and glycerol monostearate.
• Such polyhydric esters may be prepared by esterification as described in the art and/or may be commercially available.
• the ester may have one or more free hydroxy groups.
• the sulphur concentration is 0.05% by weight or less, such as 0.01% by weight or less, and may be as low as 0.005% by weight, or 0.0001% by weight, or lower.
• the art describes methods for reducing the sulphur concentration of hydrocarbon distillate fuels, such methods including for example solvent extraction, sulphuric acid treatment, and hydrodesulphurisation.
• tricyclic aromatic is meant a fixed system where three aromatic rings are fused together.
• the fuel contains less than 1% by weight of such a component.
• polar components are compounds such as those containing O, S or N; and esters; and alcohols.
• the above-mentioned wear problem is found to become progressively more acute as the polar component concentration of the fuel is decreased; for example, it may be particularly severe at concentrations below 250 ppm, such as below 200 ppm and specifically in fuels having polar component concentrations of 170 ppm and 130 ppm respectively.
• Such polar component concentrations may conveniently be measured by High Pressure Liquid Chromatography, sometimes referred to as HPLC.
• the concentration of the additive of the invention in the fuel oil may be up to 250,000 ppm, for example up to 10,000 ppm such as 1 to below 1000 ppm (active ingredient) by weight per weight of fuel, preferably 10 to 500 ppm, more preferably 10 to 200 ppm.
• the additive may be incorporated into bulk fuel oil by methods known in the art.
• the additive may be so incorporated in the form of a concentrate comprising an admixture of the additive and a liquid carrier medium compatible with the fuel oil, the additive being dispersed in the liquid medium.
• Such concentrates preferably contain from 3 to 75 wt%, more preferably 3 to 60 wt%, most preferably 10 to 50 wt% of the additive, preferably in solution in the oil.
• carrier liquid are organic solvents including hydrocarbon solvents, for example petroleum fractions such as naphtha, kerosene and heater oil; aromatic hydrocarbons; paraffinic hydrocarbons such as hexane and pentane; and alkoxyalkanols such as 2-butoxyethanol.
• the carrier liquid must of course be selected having regard to its compatibility with the additive and with the fuel.
• the additives of the invention may be used singly or as mixtures of more than one additive. They may also be used in combination with one or more co-additives such as known in the art, for example the following: detergents, antioxidants (to avoid fuel degradation), corrosion inhibitors, dehazers, demulsifiers, metal deactivators, antifoaming agents, cetane improvers, cosolvents, package compatibilisers, and middle distillate cold flow improvers.
• co-additives such as known in the art, for example the following: detergents, antioxidants (to avoid fuel degradation), corrosion inhibitors, dehazers, demulsifiers, metal deactivators, antifoaming agents, cetane improvers, cosolvents, package compatibilisers, and middle distillate cold flow improvers.
• the fuels used were diesel fuels having the following characteristics I S content ⁇ 0.01% (wt/wt) Aromatics content ⁇ 1% (wt/wt) Cetane number 55.2 to 56.1 Cold Filter Plugging Point Temperature (CFPPT) -36°C 95% boiling point 273°C II S content ⁇ 0.01% (wt/wt) Aromatics not measured Cetane number not measured CFPPT -41°C 95% boiling point 263°C
• Additives D and E were dissolved in certain of fuels I and II and the resulting composition tested using:

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Cited By (6)

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• 1993
  • 1993-01-21 GB GB939301119A patent/GB9301119D0/en active Pending
• 1994
  • 1994-01-20 DK DK94905667.5T patent/DK0680506T3/da active
  • 1994-01-20 BR BR9405814A patent/BR9405814A/pt not_active IP Right Cessation
  • 1994-01-20 ES ES94905667T patent/ES2098125T3/es not_active Expired - Lifetime
  • 1994-01-20 AT AT94905667T patent/ATE148157T1/de not_active IP Right Cessation
  • 1994-01-20 JP JP6516655A patent/JP2634697B2/ja not_active Expired - Lifetime
  • 1994-01-20 EP EP94905667A patent/EP0680506B1/en not_active Revoked
  • 1994-01-20 KR KR1019950702995A patent/KR100286781B1/ko not_active IP Right Cessation
  • 1994-01-20 DE DE69401576T patent/DE69401576T2/de not_active Revoked
  • 1994-01-20 CA CA002154344A patent/CA2154344C/en not_active Expired - Lifetime
  • 1994-01-20 RU RU95122648/04A patent/RU2161640C2/ru active
  • 1994-01-20 AU AU59697/94A patent/AU676713B2/en not_active Expired
  • 1994-01-20 WO PCT/EP1994/000148 patent/WO1994017160A1/en not_active Application Discontinuation
  • 1994-01-21 ZA ZA94447A patent/ZA94447B/xx unknown
• 1995
  • 1995-07-17 NO NO19952830A patent/NO310567B1/no not_active IP Right Cessation
  • 1995-07-20 FI FI953499A patent/FI120792B/fi not_active IP Right Cessation
• 1997
  • 1997-01-31 GR GR970400173T patent/GR3022462T3/el unknown

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