EP0946686A1 - Compositions de carburant - Google Patents

Compositions de carburant

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Publication number
EP0946686A1
EP0946686A1 EP96934644A EP96934644A EP0946686A1 EP 0946686 A1 EP0946686 A1 EP 0946686A1 EP 96934644 A EP96934644 A EP 96934644A EP 96934644 A EP96934644 A EP 96934644A EP 0946686 A1 EP0946686 A1 EP 0946686A1
Authority
EP
European Patent Office
Prior art keywords
carbon atoms
alkyl
hydrogen
group
independently selected
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
EP96934644A
Other languages
German (de)
English (en)
Inventor
Charles Lee Edwards
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Infineum Holdings BV
Original Assignee
Infineum Holdings BV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Infineum Holdings BV filed Critical Infineum Holdings BV
Priority to EP96934644A priority Critical patent/EP0946686A1/fr
Priority claimed from PCT/EP1996/004431 external-priority patent/WO1998016602A1/fr
Publication of EP0946686A1 publication Critical patent/EP0946686A1/fr
Ceased legal-status Critical Current

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Definitions

  • the present invention relates to the use of sulfur- containing compounds as additives in fuel compositions and the use of these compounds to decrease intake valve deposits.
  • the present invention is directed to the use of sulfur-containing compounds as additives in fuel compositions comprising a major amount of hydrocarbons in the gasoline boiling range and a minor amount of one or more sulfur- containing compounds of Formula I :
  • R is selected from hydrogen, alkyl of 1 to 20 carbon atoms, acyl of 2 to 20 carbon atoms; aryl of 6 to 20 carbon atoms and polyoxyalkylene alcohol of Formula II:
  • each R 4 is independently selected from alkyl of 2 to 20 carbon atoms and z is from 1 to 50; each R 2 is independently selected from alkyl of 2 to 20 carbon atoms; each R 3 is independently selected from alkyl of 2 to 20 carbon atoms; x is from 0 to 10; y is from 1 to 50 and the weight average molecular weight of the additive compound is at least 600.
  • the invention is also directed to the use of these compounds for decreasing intake valve deposits. Description Of The Preferred Embodiments
  • the compounds of the present invention are a new class of additives useful for hydrocarbon fuels, e.g., fuels in the gasoline boiling range, for preventing deposits in engines, while also decomposing during combustion to environmentally acceptable products.
  • the compounds produce very little residue and are miscible with carriers and other detergents.
  • Non- limiting illustrative embodiments of the compounds useful as additives in the instant invention include those of Formula I: R,-S-(R 2 -0) x -(R 3 -0) y -H (I)
  • R j is selected from hydrogen, alkyl of 1 to 20 carbon atoms, acyl of 2 to 20 carbon atoms, aryl of 6 to 20 carbon atoms and polyoxyalkylene alcohol of Formula II:
  • each R 4 is independently selected from alkyl of 2 to 20 carbon atoms and z is from 1 to 50.
  • R is alkyl of 1 to 20 carbon atoms
  • the alkyl may be linear or branched.
  • R is alkyl
  • it is alkyl of 1 to 12 carbon atoms, more preferably alkyl of 1 to 10 carbon atoms .
  • R is methyl .
  • the acyl will have a total of 2 to 20 carbon atoms. More preferably, when R [ is acyl, it will be acyl of 2 to 8 carbon atoms.
  • the carbon atoms attached to the central carbon atom i.e., those carbon atoms represented by A' in the formula A'-C-
  • R is aryl
  • it will preferably be aryl of 6 to 20 carbon atoms. More preferably, when R, is aryl, it will be aryl of 6 carbon atoms.
  • the aryl may be unsubstituted or substituted in any manner.
  • R can also be polyoxyalkylene alcohol of Formula II:
  • each R 4 is independently selected from alkyl of 2 to 20 carbon atoms and z is from 1 to 50.
  • each R 4 is independently selected from alkyl of 2 to 12 carbon atoms.
  • Preferred compounds are those in which R 4 is alkyl of 2 to 4 carbon atoms, especially alkyl of 4 carbon atoms.
  • Particularly preferred compounds of Formula I are those in which when R, is polyoxyalkylene of Formula II, R 4 is alkyl (geminal or vicinal) of formula:
  • R 5 , R ⁇ and R 7 are each independently selected from hydrogen and alkyl of 1 to 18 carbon atoms.
  • R ⁇ and R 5 or alternatively R 5 and R 7 , may be taken together to form a divalent linking alkyl group of 3 to 12 carbon atoms.
  • Preferred compounds of Formula I are those in which when R, is polyoxyalkylene alcohol of Formula II, each R 4 is alkyl as represented by Formula III above wherein R 7 is hydrogen and R 5 is independently selected from hydrogen and alkyl of 1 to 18 carbon atoms, particularly those compounds where R 7 is hydrogen and R 5 is independently hydrogen or alkyl of 1 to 2 carbon atoms, especially those compounds where R 7 is hydrogen and R 5 is alkyl of 2 carbon atoms .
  • z is from 1 to 50, preferably from 1 to 40, and even more preferably from 1 to 26.
  • R is polyoxyalkylene alcohol
  • z will not have a fixed value but will instead be represented by a range of different values.
  • z is considered to be a (number) average of the various values of z that are found in a given composition, which number has been rounded to the nearest integer.
  • each R 4 can be alkyl of four carbon atoms.
  • the R 4 's can differ and for instance, independently be alkyl from two to four carbon atoms.
  • the R 4 's may be present in blocks, i.e., all z groups in which R 4 is alkyl of three carbon atoms will be adjacent, followed by all z groups in which R 4 is alkyl of two carbon atoms, followed by all z groups in which R 4 is alkyl of four carbon atoms.
  • the R 4 's may also be present in any random distribution.
  • Each It is independently selected from alkyl of 2 to 20 carbon atoms.
  • each R 2 is independently selected from alkyl of 2 to 12 carbon atoms and more preferably 2 to 3 carbon atoms.
  • the alkyl may be branched, but in the more preferred embodiments, especially when the R 2 is an alkyl of 2 to 3 carbon atoms, the alkyl will be linear.
  • x is from 0 to 10, preferably from 1 to 5, and even more preferably 1.
  • x will not have a fixed value but will instead be represented by a range of different values.
  • each R 2 can be alkyl of four carbon atoms.
  • the R 2 ' ⁇ can differ and for instance, independently be alkyl from two to four carbon atoms.
  • the R 2 's may be present in blocks, i.e., all x groups in which R 2 is alkyl of three carbon atoms will be adjacent, followed by all x groups in which R 2 is alkyl of two carbon atoms, followed by all x groups in which R 2 is alkyl of four carbon atoms.
  • the R s may also be present in any random distribution.
  • Each R 3 is independently selected from alkyl of 2 to 20 carbon atoms. Preferably each R 3 is independently selected from alkyl of 2 to 12 carbon atoms. Preferred compounds are those in which R 3 is alkyl of 2 to 4 carbon atoms, especially alkyl of 4 carbon atoms .
  • Particularly preferred compounds of Formula I are those in which R 3 is alkyl (geminal or vicinal) of formula: R 10 -CH-C I— (V) or -CH-CH- (VI) wherein R 8 , Rg and R 10 are each independently hydrogen or alkyl of 1 to 18 carbon atoms. R 10 and Ro, or alternatively Rg and R ⁇ , may be taken together to form a divalent linking alkyl group of 3 to 12 carbon atoms.
  • R 3 is represented by Formula V above wherein R 10 is hydrogen and R 8 is independently hydrogen or alkyl of 1 to 18 carbon atoms, particularly those compounds where R 10 is hydrogen and R 8 is independently hydrogen or alkyl of 1 to 2 carbon atoms, especially those compounds where R 10 is hydrogen and R 8 is alkyl of two carbon atoms .
  • y is from 1 to 50, preferably from 1 to 40, and even more preferably from 1 to 26.
  • y is considered to be a (number) average of the various values of y that are found in a given composition, which number has been rounded to the nearest integer and y is considered to be a (number) average of the various values of y that are found in a given composition, which number has been rounded to the nearest integer.
  • polydispersity molecular weight based on the weight average divided by the molecular weight based on the number average).
  • each R 3 can be alkyl of four carbon atoms.
  • the R 3 's can differ and for instance, independently be alkyl from two to four carbon atoms.
  • the R ⁇ differ, they may be present in blocks, i.e., all y groups in which R 3 is alkyl of three carbon atoms will be adjacent, followed by all y groups in which R 3 is alkyl of two carbon atoms, followed by all y groups in which R 3 is alkyl of four carbon atoms.
  • the R 3 's may also be present in any random distribution.
  • the compounds of Formula I have a total weight average molecular weight of at least 600.
  • the total weight average molecular weight is from about 800 to about 4000, even more preferably from about 800 to about 2000.
  • Typical compounds represented by Formula I include those listed by structure in Table 1.
  • y is from 1 to 26.
  • the compounds of Formula I are illustratively prepared by reacting hydroxyalkyl sulfides with one or more epoxides in the presence of a potassium compound or by reacting thioacetic acid with an allyl alkoxylate.
  • the compounds of Formula I are prepared using one or more epoxides and hydroxyalkyl sulfides represented by Formula VII:
  • R 2 and x are as defined hereinbefore and R M is selected from alkyl, aryl and hydroxyalkyls .
  • hydroxyalkyl sulfides which are suitably employed include 2,2'- thiodiethanol, 2-(methylthio)ethanol and 2-(ethylthio)ethanol .
  • hydroxyalkyl sulfides utilized are also available commercially and can be prepared by any of the methods known and described in the art.
  • the one or more epoxides employed in the reaction with the initiators to prepare the compounds of Formula I contain from 2 to 20 carbon atoms, more preferably from 2 to 4 carbon atoms, and most preferably four carbon atoms.
  • the epoxides may be internal epoxides such as 2,3 epoxides of the formula:
  • R l3 and R I2 are each independently selected from hydrogen or alkyl of 1 to 18 carbon atoms or terminal epoxides such as 1,2 epoxides of the formula:
  • R 12 and R 14 are each independently selected from hydrogen or alkyl of 1 to 18 carbon atoms.
  • R 12 , R l3 and R 14 are selected from hydrogen and alkyl of 1 to 2 carbon atoms, especially 2 carbon atoms.
  • R, 3 and R 12 , or alternatively R 12 and R 14 may be taken together to form a cycloalkylene epoxide or a vinylidene epoxide by forming a divalent linking group of 3 to 12 carbon atoms.
  • the terminal epoxides represented by Formula IX are utilized. Ideally these terminal epoxides are 1 , 2-epoxyalkanes . Suitable 1 , 2-epoxyalkanes include 1, 2-epoxyethane, 1, 2-epoxypropane, 1 , 2-epoxybutane, 1,2- epoxydecane, 1 , 2-epoxydodecane, 1 , 2-epoxyhexadecane, 1,2- epoxyoctadecane and mixtures thereof.
  • the one or more epoxides and initiator are contacted at a ratio from about 7 : 1 to about 55:1 moles of epoxide per mole of initiator. Preferably, they are contacted at a molar ratio from about 10:1 to about 30:1, with the most preferred molar ratio being about 20:1.
  • the reaction is carried out in the presence of potassium compounds which act as alkoxylation catalysts.
  • Such catalysts are conventional and include potassium methoxide, potassium ethoxide, potassium hydroxide, potassium hydride and potassium-t-butoxide.
  • the preferred catalysts are potassium hydroxide and pota ⁇ sium-t-butoxide.
  • the catalysts may be used in the presence of a base ⁇ table solvent such as alcohol, ether or hydrocarbons .
  • the catalysts are employed in a wide variety of concentrations.
  • the potassium compounds will be used in an amount from about 0.02% to about 5.0% of the total weight of the mixture, preferably from about 0.1% to about 2.0% of the total weight of the mixture, and most preferably about 0.2% of the total weight of the mixture.
  • sodium compounds such as sodium metal, sodium hydride and sodium alkoxides may also be used as alkoxylation catalysts.
  • the reaction is conveniently carried out in a conventional autoclave reactor equipped with heating and cooling means.
  • the process is practiced batchwise, continuously or semicontinuous ly .
  • the manner in which the alkoxylation reaction is conducted is not critical to the invention.
  • the initiator and potassium compound are mixed and heated under vacuum for a period of at least 30 minutes.
  • the one or more epoxides are then added to the resulting mixture, the reactor sealed and pressurized with nitrogen, and the mixture stirred while the temperature is gradually increased.
  • the temperature for alkoxylation is from about 80°C to about 250°C, preferably from about 100°C to about 150°C, and even more preferably from about 120°C to about 140°C.
  • the alkoxylation reaction time is generally from about 2 to about 20 hours, although longer or shorter times are employed.
  • the product of Formula I is normally liquid and is recovered by conventional techniques such as filtration and distillation.
  • the product is used in its crude state or is purified, if desired, by conventional techniques such as aqueous extraction, solid absorption and/or vacuum distillation to remove any remaining impurities .
  • the compounds of Formula I are prepared by reacting thioacetic acid with an allyl alkoxylate of the general formula:
  • allyl alkoxylates which may be employed include: allyl alcohol ethoxylate, allyl alcohol propoxylate and allyl alcohol butoxylate.
  • the allyl alkoxylates utilized can also be prepared by any of the methods known and described in the art, including the method described hereinbefore.
  • the thioacetic acid and allyl alkoxylate are contacted at a ratio from about 1.0 to about 2.0 moles of thioacetic acid per mole of allyl alkoxylate. Preferably, they are contacted at a molar ratio from about 1.2 to about 1.8, with the most preferred molar ratio being about 1.76:1.
  • the reaction is carried out in the presence of a catalyst.
  • the catalyst will be selected from free radical catalysts and acidic catalysts.
  • Free radical catalysts which may be used include azobisisobutyronitrile (AIBN) .
  • Acidic catalysts which may be used include toluene sulfonic acid. The preferred catalyst is azobisisobutyronitrile.
  • the catalysts are employed in a wide variety of concentrations. Generally, the free radical catalysts will be used in an amount from about 0.2 to about 1.0 of the total weight of the mixture, preferably from about 0.4 to about 0.8 of the total weight of the mixture, and most preferably about 0.5 of the total weight of the mixture.
  • the reaction is conveniently carried out in a multinecked flask equipped with a condenser, overhead ⁇ tirrer, thermowell, pressure equalized dropping funnel and N 2 inlet.
  • the process is conveniently practiced batchwise.
  • the manner in which the reaction is conducted is illustratively, by adding the allyl alkoxylate to multinecked flask and heating the allyl alkoxylate under nitrogen atmosphere.
  • the thioacetic acid and catalyst are mixed and then added dropwise to the allyl alkoxylate.
  • the mixture is then heated for an additional period of time.
  • the temperature for heating applied is from about 70°C to about 90°C, preferably from about 72°C to about 88°C, and even more preferably from about 75°C to about 85°C.
  • the reaction time is generally from about 0.5 to about 1.0 hours, although longer or shorter times are employed.
  • the product of Formula I is normally liquid and is recovered by conventional techniques such as filtration and distillation.
  • the product is used in its crude state or is purified, if desired, by conventional techniques such as aqueous extraction, solid absorption and/or vacuum distillation to remove any remaining impurities .
  • Fuel Compositions are normally liquid and is recovered by conventional techniques such as filtration and distillation.
  • the product is used in its crude state or is purified, if desired, by conventional techniques such as aqueous extraction, solid absorption and/or vacuum distillation to remove any remaining impurities .
  • the compounds of Formula I are useful as additives in fuel compositions which are burned or combusted in internal combustion engines.
  • the fuel compositions of the present invention comprise a major amount of a mixture of hydrocarbons in the gasoline boiling range and a minor amount of one or more of the compounds of Formula I.
  • the term "minor amount” means less than about 10% by weight of the total fuel composition, preferably less than about 1% by weight of the total fuel composition and more preferably less than about 0.1% by weight of the total fuel composition.
  • Suitable liquid hydrocarbon fuels of the gasoline boiling range are mixtures of hydrocarbons having a boiling range of from about 25 °C to about 232°C, and comprise mixtures of saturated hydrocarbons, olefinic hydrocarbons and aromatic hydrocarbons .
  • Preferred are gasoline mixtures having a saturated hydrocarbon content ranging from about 40% to about 80% by volume, an olefinic hydrocarbon content from 0% to about 30% by volume and an aromatic hydrocarbon content from about 10% to about 60% by volume.
  • the base fuel is derived from straight run gasoline, polymer gasoline, natural gasoline, dimer and trimerized olefins, synthetically produced aromatic hydrocarbon mixtures, or from catalytically cracked or thermally cracked petroleum stock ⁇ , and mixtures of these.
  • the hydrocarbon composition and octane level of the base fuel are not critical. The octane level, (R+M)/2, will generally be above about 85.
  • any conventional motor fuel base can be employed in the practice of the present invention.
  • hydrocarbons in the gasoline can be replaced by up to a substantial amount of conventional alcohols or ethers, conventionally known for use in fuels.
  • the base fuels are desirably substantially free of water since water could impede a smooth combustion.
  • the hydrocarbon fuel mixtures to which the invention is applied are substantially lead-free, but may contain minor amounts of blending agents such as methanol, ethanol, ethyl tertiary butyl ether, methyl tertiary butyl ether, and the like, at from about 0.1% by volume to about 15% by volume of the base fuel, although larger amounts may be utilized.
  • the fuels can also contain conventional additives including antioxidants such as phenolics, e.g., 2,6-di-tert- butylphenol or phenylenediamines , e.g., N,N'-di-sec-butyl-p- phenylenediamine, dyes, metal deactivator ⁇ , dehazers such as polyester-type ethoxylated alkylphenol-formaldehyde resins.
  • antioxidants such as phenolics, e.g., 2,6-di-tert- butylphenol or phenylenediamines , e.g., N,N'-di-sec-butyl-p- phenylenediamine, dyes, metal deactivator ⁇ , dehazers such as polyester-type ethoxylated alkylphenol-formaldehyde resins.
  • Corrosion inhibitors such as a polyhydric alcohol ester of a succinic acid derivative having on at least one of its alpha- carbon atoms an unsubstituted or substituted aliphatic hydrocarbon group having from 20 to 500 carbon atoms, for example, pentaerythritol diester of polyisobutylene-substituted succinic acid, the polyisobutylene group having an average molecular weight of about 950, in an amount from about 1 parts per million (ppm) by weight to about 1000 ppm by weight, may also be present.
  • the fuels can also contain antiknock compounds such as methyl cyclopentadienylmanganese tricarbonyl and ortho- azidophenol as well as co-antiknock compounds such as benzoyl acetone .
  • An effective amount of one or more compounds of Formula I are introduced into the combustion zone of the engine in a variety of ways to prevent build-up of deposits, or to accomplish the reduction of intake valve deposits or the modification of existing deposits that are related to octane requirement.
  • a preferred method is to add a minor amount of one or more compounds of Formula I to the fuel .
  • one or more compounds of Formula I are added directly to the fuel or are blended with one or more carriers and/or one or more additional detergents to form an additive concentrate which can be added at a later date to the fuel .
  • the amount of the one or more compounds of Formula I used will depend on the particular variation of Formula I used, the engine, the fuel, and the presence or absence of carriers and additional detergents.
  • each compound of Formula I is added in an amount up to about 1000 ppm by weight, especially from about 1 ppm by weight to about 600 ppm by weight based on the total weight of the fuel composition.
  • the amount will be from about 50 ppm by weight to about 400 ppm by weight, and even more preferably from about 75 ppm by weight to about 250 ppm by weight based on the total weight of the fuel composition.
  • the carrier when utilized, will have a weight average molecular weight from about 500 to about 5000.
  • Suitable carriers include hydrocarbon based materials such as polyisobutylenes (PIB's), polypropylenes (PP's) and polyalphaolefins (PAO' ⁇ ); polyether based materials such as polybutylene oxides (poly BO's), polypropylene oxides (poly PO's), polyhexadecene oxides (poly HO's) and mixtures thereof (i.e., both (poly BO) + (poly PO) and (poly-BO-PO) ) ; and mineral oils such as Exxon Naphthenic 900 su ⁇ and high viscosity index (HVI) oils.
  • the carrier is preferably selected from PIB's, poly BO's, and poly PO's, with poly BO's being the most preferred.
  • the carrier concentration in the final fuel composition is up to about 1000 ppm by weight. When a carrier is present, the preferred concentration is from about 50 ppm by weight to about 400 ppm by weight, based on the total weight of the fuel composition.
  • the carrier is blended with one or more compounds of Formula I, the blend is added directly to the fuel or packaged for future use.
  • Decreasing Intake Valve Depo ⁇ its The invention further provides a process for decreasing intake valve deposits in engines utilizing the compounds of the present invention. The process comprises supplying to and combusting or burning in an internal combustion engine a fuel composition comprising a major amount of hydrocarbons in the gasoline boiling range and a minor amount of one or more compounds of Formula I as described hereinbefore.
  • deposit ⁇ in the induction system By supplying to and combusting or burning the fuel composition in an internal combustion engine, deposit ⁇ in the induction system, particularly deposit ⁇ on the tulips of the intake valves, are reduced.
  • the reduction is determined by running an engine with clean induction ⁇ ystem components and pre-weighed intake valves on dynamometer test stands in such a way as to simulate road operation using a variety of cycles at varying speeds while carefully controlling specific operating parameters. The tests are run for a specific period of time on the fuel composition to be tested.
  • the induction system deposit ⁇ are vi ⁇ ually rated, the valve ⁇ are reweighed and the weight of the valve depo ⁇ its is determined.
  • the sulfur-containing compounds used in the following examples were prepared by reacting an initiator with one or more epoxides in the presence of a potassium compound or by reacting thioacetic acid with an allyl alkoxylate to produce compounds of Formula I having a weight average molecular weight from about 600 to about 4000. Weight average molecular weights (MW) were determined by gel permeation chromatography (GPC) .
  • GPC gel permeation chromatography
  • Catalyst residues were removed by the same extraction method used in Example 1 to afford a total of 241 grams of clear, pale yellow oil.
  • the material was further purified by dissolving it in hexane and treating it with basic alumina to remove any residual impurities. Removal of the hexane produced a clear, colorless oil (170 grams).
  • Analysi ⁇ of the allyl alcohol butoxylate by C 13 NMR confirmed the structure.
  • Example 3 3- thioacetoxy-1-propanol butoxylate
  • Example 3 3- thioacetoxy-1-propanol butoxylate
  • 1430 ml of ethanol was added to dissolve the butoxylate.
  • a solution of 20.1 grams (0.304 mole) of 85% potassium hydroxide was dis ⁇ olved in 280 ml of di ⁇ tilled water and added to the reaction flask thereby producing a clear reddish amber solution.
  • the reaction mixture was stirred at ambient temperature for one hour, after which time IR analysis of the mixture showed no carbonyl peaks.
  • the base fuel utilized comprised either premium unleaded gasoline (PU) (90+ octane, [R+M/2]) and/or regular unleaded gasoline (RU) (85-88 octane, [R+M/2]).
  • PU premium unleaded gasoline
  • RU regular unleaded gasoline
  • Intake Valve Deposit Tests Engines from vehicles were installed in dynamometer cells in such a way as to ⁇ imulate road operation u ⁇ ing a cycle of idle, low ⁇ peed and high speed components while carefully controlling specific operating parameters. Fuels with and without the compounds of Formula I were tested in 3.3 L Dodges and 3.0 L Fords having port fuel injection to determine the effectivenes ⁇ of the compounds of the present invention in reducing intake valve deposits ("L" refers to liter). Carbureted 0.359 L Honda generator engines were also utilized to determine the effectiveness of the compounds of the present invention in reducing intake valve deposits.
  • the engine was inspected, the induction system components were cleaned and new intake valves were weighed and installed. The oil was changed and new oil and fuel filters, gaskets and spark plugs were installed.
  • the tests were run in cycles consisting of idle, 35 mph and 65 ph for a period of 100 hours unless indicated otherwise.
  • the tests were run in cycles consisting of a no load idle mode for one minute followed by a three minute mode with a load at 2200 rpm' ⁇ for a period of 40 hours unles ⁇ indicated otherwise.
  • the intake valves were removed and weighed.
  • Results obtained using the compound of the present invention are included in the tables below. All tests of the compounds of the present invention were carried out with additive concentrations (the amount of Compound Example # used) of 200 ppm non-volatile matter (nvm) .
  • Base Fuel result ⁇ which have 0 ppm additive are al ⁇ o included for comparison purpo ⁇ es.
  • the ba ⁇ e fuels are indicated by the absence of a Compound Example # (indicated in the Compound Example # column by ).

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  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

La présente invention concerne l'utilisation de composés alcoxylés contenant du soufre comme additifs dans des compositions de carburant comprenant un mélange formé d'une grande quantité d'hydrocarbures pris dans la plage d'ébullition de l'essence et d'une petite quantité d'un ou de plusieurs de ces composés. L'invention concerne également l'utilisation de ces composés pour réduire les dépôts dans des soupapes d'admission.
EP96934644A 1996-10-11 1996-10-11 Compositions de carburant Ceased EP0946686A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP96934644A EP0946686A1 (fr) 1996-10-11 1996-10-11 Compositions de carburant

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
PCT/EP1996/004431 WO1998016602A1 (fr) 1996-08-06 1996-10-11 Compositions de carburant
EP96934644A EP0946686A1 (fr) 1996-10-11 1996-10-11 Compositions de carburant

Publications (1)

Publication Number Publication Date
EP0946686A1 true EP0946686A1 (fr) 1999-10-06

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EP96934644A Ceased EP0946686A1 (fr) 1996-10-11 1996-10-11 Compositions de carburant

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EP (1) EP0946686A1 (fr)

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9816602A1 *

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