MXPA98009913A - Combusti additives - Google Patents
Combusti additivesInfo
- Publication number
- MXPA98009913A MXPA98009913A MXPA/A/1998/009913A MX9809913A MXPA98009913A MX PA98009913 A MXPA98009913 A MX PA98009913A MX 9809913 A MX9809913 A MX 9809913A MX PA98009913 A MXPA98009913 A MX PA98009913A
- Authority
- MX
- Mexico
- Prior art keywords
- fuel
- compound
- formula
- additives
- fuels
- Prior art date
Links
- 239000000654 additive Substances 0.000 title claims abstract description 33
- 150000001875 compounds Chemical class 0.000 claims abstract description 33
- 230000001050 lubricating Effects 0.000 claims abstract description 22
- 125000003342 alkenyl group Chemical group 0.000 claims abstract description 6
- 239000000446 fuel Substances 0.000 claims description 49
- 238000005260 corrosion Methods 0.000 claims description 22
- 230000002401 inhibitory effect Effects 0.000 claims description 16
- 230000000996 additive Effects 0.000 claims description 15
- 150000002430 hydrocarbons Chemical class 0.000 claims description 13
- 239000000203 mixture Substances 0.000 claims description 13
- 239000004215 Carbon black (E152) Substances 0.000 claims description 11
- 239000007788 liquid Substances 0.000 claims description 11
- 238000004821 distillation Methods 0.000 claims description 8
- 238000007792 addition Methods 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
- 239000010763 heavy fuel oil Substances 0.000 claims description 2
- 239000002904 solvent Substances 0.000 claims description 2
- 239000003350 kerosene Substances 0.000 claims 1
- 238000002485 combustion reaction Methods 0.000 abstract description 3
- 238000005536 corrosion prevention Methods 0.000 abstract 1
- 239000002816 fuel additive Substances 0.000 description 11
- 239000002585 base Substances 0.000 description 10
- 235000014113 dietary fatty acids Nutrition 0.000 description 10
- 239000000194 fatty acid Substances 0.000 description 10
- 150000004665 fatty acids Chemical class 0.000 description 9
- 239000011541 reaction mixture Substances 0.000 description 8
- LYCAIKOWRPUZTN-UHFFFAOYSA-N glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 7
- 239000003112 inhibitor Substances 0.000 description 7
- 239000002253 acid Substances 0.000 description 6
- 239000002244 precipitate Substances 0.000 description 6
- HEMHJVSKTPXQMS-UHFFFAOYSA-M sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- YXFVVABEGXRONW-UHFFFAOYSA-N toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 6
- 230000003993 interaction Effects 0.000 description 5
- 239000003921 oil Substances 0.000 description 5
- -1 Fatty acid esters Chemical class 0.000 description 4
- FPYJFEHAWHCUMM-UHFFFAOYSA-N Maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 description 4
- 150000002148 esters Chemical class 0.000 description 4
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 4
- NHTMVDHEPJAVLT-UHFFFAOYSA-N isooctane Chemical compound CC(C)CC(C)(C)C NHTMVDHEPJAVLT-UHFFFAOYSA-N 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 239000003518 caustics Substances 0.000 description 3
- 239000002270 dispersing agent Substances 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000003208 petroleum Substances 0.000 description 3
- KDYFGRWQOYBRFD-UHFFFAOYSA-N succinic acid group Chemical group C(CCC(=O)O)(=O)O KDYFGRWQOYBRFD-UHFFFAOYSA-N 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 3
- 229910052717 sulfur Inorganic materials 0.000 description 3
- 239000011593 sulfur Substances 0.000 description 3
- MTHSVFCYNBDYFN-UHFFFAOYSA-N Diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 description 2
- 229920002367 Polyisobutene Polymers 0.000 description 2
- MRMOZBOQVYRSEM-UHFFFAOYSA-N Tetraethyllead Chemical compound CC[Pb](CC)(CC)CC MRMOZBOQVYRSEM-UHFFFAOYSA-N 0.000 description 2
- 150000001336 alkenes Chemical class 0.000 description 2
- 125000005907 alkyl ester group Chemical group 0.000 description 2
- 150000008064 anhydrides Chemical class 0.000 description 2
- 230000000111 anti-oxidant Effects 0.000 description 2
- 239000003963 antioxidant agent Substances 0.000 description 2
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 2
- 230000005591 charge neutralization Effects 0.000 description 2
- 239000003599 detergent Substances 0.000 description 2
- 239000002283 diesel fuel Substances 0.000 description 2
- FMMOOAYVCKXGMF-MURFETPASA-N ethyl linoleate Chemical compound CCCCC\C=C/C\C=C/CCCCCCCC(=O)OCC FMMOOAYVCKXGMF-MURFETPASA-N 0.000 description 2
- 229940031016 ethyl linoleate Drugs 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 239000003879 lubricant additive Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000001264 neutralization Effects 0.000 description 2
- 238000006386 neutralization reaction Methods 0.000 description 2
- 229920000098 polyolefin Polymers 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 235000011044 succinic acid Nutrition 0.000 description 2
- UYCICMIUKYEYEU-ZHACJKMWSA-N 3-[(E)-dodec-2-enyl]oxolane-2,5-dione Chemical compound CCCCCCCCC\C=C\CC1CC(=O)OC1=O UYCICMIUKYEYEU-ZHACJKMWSA-N 0.000 description 1
- NUMQCACRALPSHD-UHFFFAOYSA-N Ethyl tert-butyl ether Chemical compound CCOC(C)(C)C NUMQCACRALPSHD-UHFFFAOYSA-N 0.000 description 1
- TYQCGQRIZGCHNB-JLAZNSOCSA-N L-ascorbic acid Chemical compound OC[C@H](O)[C@H]1OC(O)=C(O)C1=O TYQCGQRIZGCHNB-JLAZNSOCSA-N 0.000 description 1
- BZLVMXJERCGZMT-UHFFFAOYSA-N MeOtBu Chemical compound COC(C)(C)C BZLVMXJERCGZMT-UHFFFAOYSA-N 0.000 description 1
- TVMXDCGIABBOFY-UHFFFAOYSA-N Octane Chemical compound CCCCCCCC TVMXDCGIABBOFY-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- RINCXYDBBGOEEQ-UHFFFAOYSA-N Succinic anhydride Chemical compound O=C1CCC(=O)O1 RINCXYDBBGOEEQ-UHFFFAOYSA-N 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 230000002528 anti-freeze Effects 0.000 description 1
- 239000002518 antifoaming agent Substances 0.000 description 1
- WTOOLIQYCQJDBG-BJILWQEISA-N but-1-ene;(E)-but-2-ene Chemical compound CCC=C.C\C=C\C WTOOLIQYCQJDBG-BJILWQEISA-N 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000003247 decreasing Effects 0.000 description 1
- 230000001419 dependent Effects 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000003009 desulfurizing Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000005886 esterification reaction Methods 0.000 description 1
- 150000002170 ethers Chemical class 0.000 description 1
- 125000000816 ethylene group Chemical group [H]C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
- 239000003502 gasoline Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000009114 investigational therapy Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- CTQNGGLPUBDAKN-UHFFFAOYSA-N o-xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 1
- 229920001515 polyalkylene glycol Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000002829 reduced Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000001384 succinic acid Substances 0.000 description 1
- 229940014800 succinic anhydride Drugs 0.000 description 1
- 229960002317 succinimide Drugs 0.000 description 1
- 238000004642 transportation engineering Methods 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
Abstract
The present invention relates to the compounds of the formula (I), wherein R1 is a C10-C32 alkenyl group, and R2 and R3 are (-OCH2CH2-) nOH, (-OCH2CHCH3-) nOH0-OCH2CHOHCH2OH in which n is an integer from 1 to 10, are the additives of lubricating power and corrosion-prevention additives for the combustion
Description
FUEL ADDITIVES
DESCRIPTION OF THE INVENTION
This invention relates to fuel additives, more particularly to additives that increase the lubricating power of the fuel and prevent undesirable interactions with the other additives now commonly present in fuels. It has also been found that the additives possess surprisingly useful anti-corrosion properties. It is known to add a smaller proportion of a large chain fatty acid to liquid hydrocarbon fuels to increase the lubricating power of the fuel, i.e. the ability to prevent wear on contact with metal surfaces. The increased lubricating power results in less wear to the surface, as measured for example by the well-known wear mark test described in more detail hereinafter. The fatty acids that have been used for this purpose include di-linoleic acid. However, the increasing number of additives now present in fuels, and the increased dosage levels, mean
REF .: 28904 that a need for additives with lubricating power is emerging with an inherently lower tendency to interact with other fuel and lubricant additives. The efficiency of the improved lubricating power for such compounds, relative to the known lubricating power additives, would also be desirable. Fatty acid esters have also been proposed as lubricant power additives. While the acid functions of these molecules are blocked by an alkyl ester group and thus are not available for interaction with other fuel additives, it is important that the efficiency of the lubricating power additive is not reduced by the esterification, so that it requires a delicate balance of properties. US-A-4448586 (for Weidig) describes liquid fuels having anti-corrosion properties for use in internal combustion engines. The inhibition of corrosion is discussed in relation to alkylene-type fuels and the ratios of reagents are such that RCOO structures are present. CH2CH2. OOCR. US-A-4874395 (to Meyer) also discloses corrosion inhibiting compositions for hydrocarbon fuels comprising a C 0 -C 24 alkenyl succinimide anhydride partially esterified with a water soluble glycol. However, the ester is then neutralized with an amine to neutralize the residual acid groups. Such acid groups are not present in the compounds of the present invention. FR-A-2169718 (for Institut Francais du Pétrole, des Carburants et Lubrifiants) describes lubricating oils comprising from 10 to 100% of esters, polyesters or esters of ethers of polyalkylene glycols represented by the formula HO (R-0) nH, in where each R is a divalent aliphatic radical of C2-Cs and n = 2-50. GB-A-1055337 (for Lubrizol) discloses oil soluble esters of a succinic acid substituted with substantially saturated hydrocarbon, wherein the substantially saturated hydrocarbon substituent has at least 50 aliphatic carbon atoms. GB-A-1306233 (for Lubrizol) discloses a fuel composition comprising a larger amount of a petroleum and a smaller amount of a dispersing composition comprising at least one oil soluble carboxy dispersant including a carboxyl group substituted by substantially saturated hydrocarbon having at least 30 aliphatic carbon atoms in the hydrocarbon substituent and a standard petroleum fraction, the ratio by weight of petroleum fraction to carboxylic dispersant is from 20: 1 to 1:10. A class of alkenyl succinic acids has now been discovered which, while demonstrating excellent efficiency as additives with lubricating power, also offer improved compatibilities with other fuel and lubricant additives. The compounds are represented by the general formula (I)
where Rx is a C10-C32 alkenyl group, such as an olefin or polyolefin, R2 and R3 are (-OCH2CH2-) n0H, (-OCH2CHCH3-) n0H or -OCH2CHOHCH2OH with n = 1-10.
Ri is more preferably a group of C? 2-C26. The value of n is preferably 1 or 2. The compounds of the formula (I) can be added to intermediate distillation fuels of poor lubricating power, such as those with a poor inherent lubricating power, and those that have been exposed to hydrotreatment. or desulfurization processes thereby decreasing the sulfur concentration to 0.5% w / w less, for example diesel fuels (typical distillation range 150-400 ° C) and heating oils (typical distillation range 150-450 ° C) and also to gasolines (typical distillation range 30-210 ° C), kerosenes (typical distillation range 140-300 ° C) and heavy fuel oils (typical distillation range 300-600 ° C). A further aspect of the invention thus comprises methods for increasing the lubricating power of such fuels by addition of the compounds of the invention. The compounds of the formula (I) can be metered in quantities between 5 and 5000 ppm, preferably between 10 and 500 ppm and more preferably between 30 and 300 ppm, to improve the properties of the lubricating power of the fuels.
Diesel fuels and heating oils will typically contain less than 0.2% w / w sulfur and may contain, in addition to the additive compositions of this invention, any of the other additives commonly added as minor components, such as cetane improvers. , cold flow improvers, detergent / dispersant additives, antifoam additives, de-incubating additives, combustion improvers, antioxidants, etc. As used herein, "gasoline" refers to motor fuels that meet the ASTM D-439 standard, and include mixtures of distilled hydrocarbon fuels with oxygenated components, such as MTBE, ETBE, ethanol, etc., as well as the same distillate fuels. The fuels may have tetraethyl lead or not have tetraethyl lead, and may contain, in addition to the additive compositions of this invention, any of the other additives conventionally added to gasolines, such as scrubbers, anti-freeze additives, improvers of the octane requirement, detergent packs, antioxidants, demulsifiers, corrosion inhibitors, etc.
It has also been found that the compounds of Formula (I) have surprisingly useful anti-corrosion properties. Thus, in certain applications in oil refineries and cargo pipes, a corrosion inhibitor is required which will be resistant to base neutralization. The base, typically sodium hydroxide, may be present in fuels that have undergone a demercaptanization treatment at the refinery. The consequence of base neutralization is the deactivation of aggregate corrosion inhibitors and the consequent levels of rust that are typical of a fuel without added corrosion inhibitors. However, it has been found that the compounds of the formula (I) provide an effective corrosion inhibition, which is resistant to base deactivation. Thus, a further aspect of the invention provides a method for inhibiting corrosion on a metal surface exposed to a liquid hydrocarbon fuel, comprising the addition to the fuel of a compound of the formula (I) as defined above. The metal surface, typically a pipe or other metal container used in fuel transportation and / or known refinery processes, will generally be made of iron or steel. The compounds of the formula (I) can be added in amounts between 5 and 5000 ppm, preferably between 10 and 500 ppm and more preferably between 30 and 300 ppm, to achieve the inhibition of the desired corrosion in the fuel. The invention also provides fuel additive compositions suitable for use in any of the prior aspects of the invention, the compositions comprise one or more compounds of the formula (I) in a solvent miscible in the fuel, for example toluene, xylene or Shellsol (available from Shell) and optionally other ingredients conventionally used in the fuel additive packages. The compounds of the formula (I) can, for example, be prepared by reacting an anhydride of the formula:
with an alcohol of the formula R 2 OH and / or R 3 OH, wherein R 2 and R 3 are as defined in the foregoing. The anhydride is conveniently prepared by the addition of the olefin or polyolefin through the double bond of the maleic anhydride by processes known per se. The invention is illustrated by the following examples.
Preparation of the compounds. A. A reaction mixture containing 59 g of maleic anhydride together with 190 g of a polyisobutylene, such as NAPVIS XD 35
(available from BP), heated at 230 ° C for 16 hours. After this period the solution is distilled under vacuum for 4 hours and then cooled to room temperature. 170 g of toluene and 81 g of diethylene glycol are then added and the mixture is heated at 140 ° C for 8 hours with the water reaction product continuously removed. The reaction mixture is cooled to room temperature and the viscous liquid remaining in the reactor is used directly as a fuel additive.
B. 50 g of maleic anhydride is added over 3 hours to 200 g of a polyisobutylene, such as INDOPOL L14 (available from Amoco), which is heated to 200 ° C. The reaction mixture is then heated at 200 ° C for another 16 hours. After this period the reaction mixture is distilled under vacuum for 2 hours, and then cooled to room temperature. Then 186 g of ethylene glycol is added to the reaction mixture and the mixture is heated at 170 ° for 12 hours. After this period the reaction mixture is distilled under vacuum for 2 hours, and then cooled to room temperature. The viscous liquid remaining in the reactor is used directly as a fuel additive.
C. A reaction mixture containing 18 g of ethylene glycol together with 35 g of 2-dodecen-1-ylsuccinic anhydride and 36 g of toluene is heated to 160 ° C with removal of water with a Dean Stark trap until the reaction It is complete. The viscous liquid remaining in the reactor is used directly as a fuel additive.
D. 358 g of polyisobutenyl succinic anhydride, prepared from maleic anhydride and
NAPVIS XlO (available from BP) in the same way as (B) above, is mixed with 372 g of ethylene glycol, and the mixture is heated at 170-190 ° C for 12 hours with continuous elimination of the byproduct of
•Water. After this period the reaction mixture is distilled under vacuum for 2 hours, then cooled to room temperature. The viscous liquid can be used directly as a fuel additive or can be diluted with SHELLSOL AB (available from Shell).
Improvement of the Lubricating Power of Fuel A bench test of a Mechanism
High Frequency Oscillator (HFRR), as described in the Technical Article of SAE 932692, can measure the lubricating power of base fuels and metered fuels with lubricating power additives. The results of such tests are reported as ball wear in terms of average wear mark diameter. The lower wear mark diameters are indicative of a better lubricating power. The results of the wear mark diameter of HFRR (in μm) are compared in the following for typical Northern European intermediate distillation fuels which have been treated with the compounds of the formula (I), an acid-based additive. commercial fatty acid, and an alkyl ester of a commercial fatty acid (ethyl linoleate) respectively. The fuels contain less than 0.05% w / w of sulfur content.
Base Fuel 100 ppm 200 ppm
Additive with commercial fatty acid base 525 471 434 Ethyl Linoleate 513 590 578 Compound B 525 420 380 Compound C 525 454 426
Base Fuel 50 ppm 100 ppm
Compound A 660 555 552 Interaction Tests Precipitation tests can be used as an indication of the severity of the interactions between the lubricating power additive and the lubricants, a typical test is described in Technical Article 872119 of the SAE. The results of the interaction test are presented in the following for compound B and a commercial fatty acid additive.
- No Precipitate 4 Medium Precipitate 1 Trace Minimum 5 Precipitate Heavy 2 Precipitate Trace 5 Precipitate Sticky 3 Precipitate Light * Not Classified (Weekend) Inhibition of Corrosion in Fuels A standardized corrosion test, such as the standard test of the National Association of Corrosion Engineers (NACE) TM-01-72, can measure the effectiveness of corrosion inhibitors that are introduced into cargo pipes to prevent rust caused by traces of moisture that condense from the products. The results of such a test are reported as a relative proportion on the A-E scale. The corrosion classifications and the rust percentage are compared in the following for iso-octane samples which have been treated with a compound of the formula (I), a commercially available fatty acid additive and a non-acid lubricating additive. commercial. Iso-octane is used for this test as a standard fuel medium to eliminate fuel-dependent effects.
Additive concentration (mg / l) in iso-octane 0 5.7 11. 22.8
Additive with commercial fatty acid base E 90 A 0 -
Compound B E 90 B ++ 0.5 A 0 A 0
Lubricating power additive without commercial acid E 90 D 60 B 15 B 15 Classification Proportion of the test surface with rust
A None B ++ Less than 0.1% (2 or 3 spots of no more than 1 mm in diameter) B + Less than 5% B from 5% to 25% C from 25% to 50% D from 50% to 75% E of 75 % to 100%
Maintenance of corrosion inhibition in "caustic" fuels The reduction in the effectiveness of the corrosion inhibitor in fuels containing alkali was demonstrated by the resistance of the inhibitor to the extraction with the caustic material. One such test of extraction investigation with caustic material involves dosing fuels with 5% v / v of NaOH (aqueous) at 8% w / w and then 5% v / v of H20 before the corrosion test via the protocol of the NACE
Additive concentration (mg / l) in iso-octane 4.3 8.6
Additive with commercial fatty acid base E 90 E 90 E 90
Compound B E 90 B + 2 B + 2
It is noted that in relation to this date, the best method known to the applicant to carry out the aforementioned invention, is the conventional one for the manufacture of the objects or products to which it refers. Having described the invention as above, property is claimed as contained in the following:
Claims (12)
1. A compound of the formula (I) characterized in that Ri is a C10-C32 alkenyl group and R2 and R3 are (-OCH2CH2-) nOH, (-OCH2CHCH3-) nOH or -0CH2CH0HCH0H with which n is an integer from 1 to 10, with the proviso that that when Rx is a C12 alkenyl group, R2 and R3 are not both -OCH2CH2OH.
2. A compound according to claim 1, characterized in that Ri is an alkenyl group of C 2 -C 26.
3. A compound according to claim 1, characterized in that n is 1 or 2.
4. An additive composition suitable for the addition to a hydrocarbon fuel characterized in that it comprises a compound of the formula (I) according to claim 1, in a solvent miscible in the fuel.
5. A fuel composition characterized in that it comprises an intermediate distillation fuel, kerosine or heavy fuel oil and a compound of the formula (I): where Ri is a C10-C32 alkenyl group and R2 and R3 are (-OCH2CH2-) n0H, (-OCH2CHCH3-) nOH or -OCH2CHOHCH2OH with which n is an integer from 1 to 10.
6. A fuel according to claim 5, characterized in that the compound of the formula (I) is present in a concentration of 5 to 5000 ppm by weight.
7. A fuel according to claim 6, characterized in that the compound is present in a concentration of 10 to 500 ppm by weight.
8. A fuel according to claim 7, characterized in that the compound is present in a concentration of 30 to 300 ppm by weight.
9. A method for increasing the lubricating power of a liquid hydrocarbon fuel characterized in that it comprises the addition to the fuel of a compound of the formula (I) according to claim 5.
10. A method for inhibiting corrosion on a metal surface exposed to a liquid hydrocarbon fuel, characterized in that it comprises the addition to the fuel of a compound of the formula (I) according to claim 5.
11. The use of a compound of the formula (I) according to claim 5, to increase the lubricating power of a liquid hydrocarbon fuel.
12. The use of a compound of the formula (I) according to claim 5, for inhibiting corrosion of a metal surface exposed to a liquid hydrocarbon fuel.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9619701-7 | 1996-09-20 | ||
| GB9619701.7 | 1996-09-20 | ||
| GB9611406.1 | 1996-09-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| MXPA98009913A true MXPA98009913A (en) | 1999-07-06 |
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