CA2420248C - Low phosphorus lubricating oil composition - Google Patents
Low phosphorus lubricating oil composition Download PDFInfo
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- CA2420248C CA2420248C CA2420248A CA2420248A CA2420248C CA 2420248 C CA2420248 C CA 2420248C CA 2420248 A CA2420248 A CA 2420248A CA 2420248 A CA2420248 A CA 2420248A CA 2420248 C CA2420248 C CA 2420248C
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- lubricating oil
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- oil composition
- oil
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- 239000000203 mixture Substances 0.000 title claims abstract description 49
- 239000010687 lubricating oil Substances 0.000 title claims abstract description 38
- 229910052698 phosphorus Inorganic materials 0.000 title claims abstract description 24
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 title claims abstract description 23
- 239000011574 phosphorus Substances 0.000 title claims abstract description 23
- 239000003921 oil Substances 0.000 claims abstract description 55
- 239000000446 fuel Substances 0.000 claims abstract description 51
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 36
- 239000005864 Sulphur Substances 0.000 claims abstract description 36
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims description 9
- 238000002485 combustion reaction Methods 0.000 claims description 7
- 229910052725 zinc Inorganic materials 0.000 claims description 7
- 239000011701 zinc Substances 0.000 claims description 7
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 6
- 125000000217 alkyl group Chemical group 0.000 claims description 6
- 239000003963 antioxidant agent Substances 0.000 claims description 6
- 239000000654 additive Substances 0.000 claims description 4
- 125000004432 carbon atom Chemical group C* 0.000 claims description 4
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims description 4
- KZNICNPSHKQLFF-UHFFFAOYSA-N succinimide Chemical compound O=C1CCC(=O)N1 KZNICNPSHKQLFF-UHFFFAOYSA-N 0.000 claims description 3
- 239000008186 active pharmaceutical agent Substances 0.000 claims description 2
- 229910052784 alkaline earth metal Inorganic materials 0.000 claims description 2
- 230000003078 antioxidant effect Effects 0.000 claims description 2
- 238000003912 environmental pollution Methods 0.000 claims description 2
- -1 alkaline earth metal sulphonate Chemical class 0.000 claims 1
- 229960002317 succinimide Drugs 0.000 claims 1
- 230000002411 adverse Effects 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 8
- 238000012360 testing method Methods 0.000 description 57
- 241000899793 Hypsophrys nicaraguensis Species 0.000 description 18
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 15
- 238000010790 dilution Methods 0.000 description 10
- 239000012895 dilution Substances 0.000 description 10
- 239000010913 used oil Substances 0.000 description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- 238000004458 analytical method Methods 0.000 description 7
- 238000009472 formulation Methods 0.000 description 7
- 239000011777 magnesium Substances 0.000 description 7
- 230000015556 catabolic process Effects 0.000 description 6
- 238000006731 degradation reaction Methods 0.000 description 6
- 230000006698 induction Effects 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 150000002739 metals Chemical class 0.000 description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 5
- 235000006708 antioxidants Nutrition 0.000 description 5
- 229910052742 iron Inorganic materials 0.000 description 5
- 229910052710 silicon Inorganic materials 0.000 description 5
- 239000010703 silicon Substances 0.000 description 5
- 239000002253 acid Substances 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 239000003054 catalyst Substances 0.000 description 3
- 239000006260 foam Substances 0.000 description 3
- 229930195733 hydrocarbon Natural products 0.000 description 3
- 150000002430 hydrocarbons Chemical class 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 239000003208 petroleum Substances 0.000 description 3
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 2
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- JXLHNMVSKXFWAO-UHFFFAOYSA-N azane;7-fluoro-2,1,3-benzoxadiazole-4-sulfonic acid Chemical compound N.OS(=O)(=O)C1=CC=C(F)C2=NON=C12 JXLHNMVSKXFWAO-UHFFFAOYSA-N 0.000 description 2
- 229910052788 barium Inorganic materials 0.000 description 2
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 2
- 229910052796 boron Inorganic materials 0.000 description 2
- GDTBXPJZTBHREO-UHFFFAOYSA-N bromine Chemical compound BrBr GDTBXPJZTBHREO-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000001627 detrimental effect Effects 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 229910052750 molybdenum Inorganic materials 0.000 description 2
- 239000011733 molybdenum Substances 0.000 description 2
- 238000006386 neutralization reaction Methods 0.000 description 2
- 229920005652 polyisobutylene succinic anhydride Polymers 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- BZLVMXJERCGZMT-UHFFFAOYSA-N Methyl tert-butyl ether Chemical compound COC(C)(C)C BZLVMXJERCGZMT-UHFFFAOYSA-N 0.000 description 1
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- 150000004945 aromatic hydrocarbons Chemical class 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 229910052794 bromium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 239000013256 coordination polymer Substances 0.000 description 1
- 239000004148 curcumin Substances 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- BHEPBYXIRTUNPN-UHFFFAOYSA-N hydridophosphorus(.) (triplet) Chemical compound [PH] BHEPBYXIRTUNPN-UHFFFAOYSA-N 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 241000894007 species Species 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
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- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
- C10M169/04—Mixtures of base-materials and additives
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- C10M101/00—Lubricating compositions characterised by the base-material being a mineral or fatty oil
- C10M101/02—Petroleum fractions
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- C10M129/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen
- C10M129/02—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen having a carbon chain of less than 30 atoms
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- C10M133/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing nitrogen
- C10M133/02—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing nitrogen having a carbon chain of less than 30 atoms
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- C10M133/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing nitrogen
- C10M133/52—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing nitrogen having a carbon chain of 30 or more atoms
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- C10M133/56—Amides; Imides
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- C10M137/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing phosphorus
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- C10M137/04—Phosphate esters
- C10M137/10—Thio derivatives
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- C10M2203/1065—Naphthenic fractions used as base material
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- C10M2215/068—Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to carbon atoms of six-membered aromatic rings having amino groups bound to polycyclic aromatic ring systems, i.e. systems with three or more condensed rings
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
- C10M2215/24—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions having hydrocarbon substituents containing thirty or more carbon atoms, e.g. nitrogen derivatives of substituted succinic acid
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
- C10M2215/28—Amides; Imides
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
- C10M2219/04—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions containing sulfur-to-oxygen bonds, i.e. sulfones, sulfoxides
- C10M2219/046—Overbasedsulfonic acid salts
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
- C10M2219/08—Thiols; Sulfides; Polysulfides; Mercaptals
- C10M2219/082—Thiols; Sulfides; Polysulfides; Mercaptals containing sulfur atoms bound to acyclic or cycloaliphatic carbon atoms
- C10M2219/087—Thiols; Sulfides; Polysulfides; Mercaptals containing sulfur atoms bound to acyclic or cycloaliphatic carbon atoms containing hydroxy groups; Derivatives thereof, e.g. sulfurised phenols
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- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
- C10M2219/08—Thiols; Sulfides; Polysulfides; Mercaptals
- C10M2219/082—Thiols; Sulfides; Polysulfides; Mercaptals containing sulfur atoms bound to acyclic or cycloaliphatic carbon atoms
- C10M2219/087—Thiols; Sulfides; Polysulfides; Mercaptals containing sulfur atoms bound to acyclic or cycloaliphatic carbon atoms containing hydroxy groups; Derivatives thereof, e.g. sulfurised phenols
- C10M2219/088—Neutral salts
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- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
- C10M2219/08—Thiols; Sulfides; Polysulfides; Mercaptals
- C10M2219/082—Thiols; Sulfides; Polysulfides; Mercaptals containing sulfur atoms bound to acyclic or cycloaliphatic carbon atoms
- C10M2219/087—Thiols; Sulfides; Polysulfides; Mercaptals containing sulfur atoms bound to acyclic or cycloaliphatic carbon atoms containing hydroxy groups; Derivatives thereof, e.g. sulfurised phenols
- C10M2219/089—Overbased salts
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- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2223/00—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions
- C10M2223/02—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions having no phosphorus-to-carbon bonds
- C10M2223/04—Phosphate esters
- C10M2223/045—Metal containing thio derivatives
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- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2227/00—Organic non-macromolecular compounds containing atoms of elements not provided for in groups C10M2203/00, C10M2207/00, C10M2211/00, C10M2215/00, C10M2219/00 or C10M2223/00 as ingredients in lubricant compositions
- C10M2227/06—Organic compounds derived from inorganic acids or metal salts
- C10M2227/061—Esters derived from boron
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- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2010/00—Metal present as such or in compounds
- C10N2010/04—Groups 2 or 12
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- C10N2040/00—Specified use or application for which the lubricating composition is intended
- C10N2040/25—Internal-combustion engines
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- C10N2040/25—Internal-combustion engines
- C10N2040/251—Alcohol-fuelled engines
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- C10N2040/255—Gasoline engines
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- C10N2040/00—Specified use or application for which the lubricating composition is intended
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Abstract
This invention relates to a lubricating oil composition used in conjunction with a gasoline fuel having a sulphur content of less than 10 ppm by weight, characterised in that said oil composition has a phosphorus content of no more than 0.05 % by weight. The feature of the invention is that the use of a low sulphur fuel enables the amount of anti-wear agents containing phosphorus such as eg ZDDP to be halved without any adverse effect on the antiwear performance of the lubricating oil.
Description
LOW PHOSPHORUS LUBRICATING OIL COMPOSITION
This invention relates to lubricating oil compositions of low phosphorus content for use in conjunction with ultra-low sulphur gasoline compositions in order to reduce exhaust emissions without adversely affecting fuel econo.my.
Fuels such as motor gasoline are widely used in automotive transport. However, in line with the general thrust to reduce air pollution, petroleum companies and vehicle manufacturers are looking to develop systems that have reduced exhaust emissions and improved fuel economy. The petroleum companies in turn are introducing fuels with low sulphur content as they are considered to be more compatible with exhaust catalyst systems.
Such fuels are generally used in conjunction with lubricating oils which inevitably contain phosphonis in the form of eg zinc dialkyl dithiophosphate (ZDDP). It was believed that low sulphur motor gasoline may transfer less acid species in blow by and therefore impart less stress on the overbased detergency properties of the lubricating oil than would a motor gasoline which is relatively high in sulphur. It was also expected that there would be a corresponding reduction in any adverse impact on the performance of the antioxidant and anti-wear components of such oils. It has also now been recognised that phosphorus also has a detrimental effect on exhaust catalyst systems. Consequently, it has been an objective to develop lubricating oil formulations with reduced phosphorus content. However, whilst ZDDP is the key anti-wear agent in lubricating oil formulations, excessive engine wear can also be reduced to an extent by supplementing ZDDP with other phosphorus-free antiwear agents such as eg oligomeric esters. The issue of wear is of concern, especially with ultra-low sulphur fuels, since the reduction of sulphur content may also adversely affect the lubricity of the resultant fuel and may lead to premature wear in some submerged electric gasoline pumps. Moreover, loss of fuel lubricity may also lead to loss of fuel economy.
Experiments carried out in the context of the present invention have showed that the largest effect of using low sulphur ftiels in conjunction with conventional lubricating oils was observed on the anti-wear performance of the lubricating oil formulations as reflected by the iron content of the used oil. It was surprisingly found that low sulphur motor gasoline caused less wear than the high sulphur motor gasoline in spite of the reduced sulphur content which hitherto had been known to adversely affect lubricity. More importantly, this led to the observation that the phosphonis content of the lubricating oil composition could be halved without adversely affecting the wear protection afforded by such oils.
Most surprisingly, lowering the phosphonis content of lubricating oils and the sulphur content of the fiiel gave a synergistic benefit, providing the lowest iron content of all even though lowering the sulphur and phosphonis content would have been expected to increase wear as indicated by iron content. This suggests that lubricating oils for use in conjunction with low CONFIRMATION COPY
This invention relates to lubricating oil compositions of low phosphorus content for use in conjunction with ultra-low sulphur gasoline compositions in order to reduce exhaust emissions without adversely affecting fuel econo.my.
Fuels such as motor gasoline are widely used in automotive transport. However, in line with the general thrust to reduce air pollution, petroleum companies and vehicle manufacturers are looking to develop systems that have reduced exhaust emissions and improved fuel economy. The petroleum companies in turn are introducing fuels with low sulphur content as they are considered to be more compatible with exhaust catalyst systems.
Such fuels are generally used in conjunction with lubricating oils which inevitably contain phosphonis in the form of eg zinc dialkyl dithiophosphate (ZDDP). It was believed that low sulphur motor gasoline may transfer less acid species in blow by and therefore impart less stress on the overbased detergency properties of the lubricating oil than would a motor gasoline which is relatively high in sulphur. It was also expected that there would be a corresponding reduction in any adverse impact on the performance of the antioxidant and anti-wear components of such oils. It has also now been recognised that phosphorus also has a detrimental effect on exhaust catalyst systems. Consequently, it has been an objective to develop lubricating oil formulations with reduced phosphorus content. However, whilst ZDDP is the key anti-wear agent in lubricating oil formulations, excessive engine wear can also be reduced to an extent by supplementing ZDDP with other phosphorus-free antiwear agents such as eg oligomeric esters. The issue of wear is of concern, especially with ultra-low sulphur fuels, since the reduction of sulphur content may also adversely affect the lubricity of the resultant fuel and may lead to premature wear in some submerged electric gasoline pumps. Moreover, loss of fuel lubricity may also lead to loss of fuel economy.
Experiments carried out in the context of the present invention have showed that the largest effect of using low sulphur ftiels in conjunction with conventional lubricating oils was observed on the anti-wear performance of the lubricating oil formulations as reflected by the iron content of the used oil. It was surprisingly found that low sulphur motor gasoline caused less wear than the high sulphur motor gasoline in spite of the reduced sulphur content which hitherto had been known to adversely affect lubricity. More importantly, this led to the observation that the phosphonis content of the lubricating oil composition could be halved without adversely affecting the wear protection afforded by such oils.
Most surprisingly, lowering the phosphonis content of lubricating oils and the sulphur content of the fiiel gave a synergistic benefit, providing the lowest iron content of all even though lowering the sulphur and phosphonis content would have been expected to increase wear as indicated by iron content. This suggests that lubricating oils for use in conjunction with low CONFIRMATION COPY
sulphur fuels can henceforth be formulated with reduced phosphorus levels without adversely affecting wear performance.
Thus, it has now been found that low phosphorus lubricating oils can be used in conjunction with ultra-low sulphur fuels without adversely affecting the fuel economy performance or the efficiency of the exhaust catalyst system of a vehicle.
Accordingly, the present invention is a lubricating oil composition used in conjunction with a gasoline fuel having a sulphur content of less than 10 ppm by weight, characterised in that said oil composition has a phosphorus content of no more than 0.05%
by weight. Thus in one aspect, the invention is the use in an internal combustion engine operating on gasoline fuel having a sulphur content of less than 10 ppm by weight, of a lubricating oil composition having a phosphorous content of no more than 0.05%
by weight, for the purpose of reducing environmental pollution.
The present invention will be described as set out herein with reference to Figure 1.
Figure 1 shows the wear effects for fuel/lube combinations for intermediate samples.
Further discussion is provided on page 12.
As described above, the sulphur content of the fuel composition is less than 10 ppm by weight, is preferably less than 5 ppm by weight. The sulphur measurement methods used were by X-ray (ASTM D2622-1) or by UV (ASTM D5453-93). Such low sulphur levels can be achieved in a number of ways. The base fuels may comprise mixtures of saturated, olefinic and aromatic hydrocarbons and these can be derived from straight run streams, thermally or catalytically cracked hydrocarbon feedstocks, hydrocracked petroleum fractions, catalytically reformed hydrocarbons, or synthetically produced hydrocarbon mixtures such as those derived from methane. Typically, the present invention is applicable to fuels such as the light boiling gasoline (which typically boils between 50 and 200 C), especially motor gasoline. The sulphur content of such fuels can be reduced below the 10 ppm level by well known methods such as eg, catalytic hydrodesulphurisation.
The lubricating oil compositions used in conjunction with the ultra-low sulphur fuels in the present invention are suitably Group II, Group III or Group IV
basestock as defined by the API and are preferably Group II basestock. These compositions suitably contain the conventional additives selected from the group consisting of:
phenolic and/or 2a aminic antioxidants, demulsifiers, viscosity index improvers, anti-wear agents, alkaline earth metal sulphonates, and polyisobutenyl succinimides which may optionally be borated. These oil compositions suitably have: a kinematic viscosity at 40 C
(KV40) of about 75 cSt or less, preferably from 50-75 cSt, more preferably from 60-70 cSt (eg about 66-67 cSt); a KVloo of below 20 cSt, preferably from 10-15 cSt (eg about 11 cSt); a pour point below -20 C, preferably below -30 C (eg about -33 C); a flash point of about 200 C, preferably above 215 C (eg 220 C); a NOACK volatility of up to 15% (eg 14.3%);
a TBN
value of about 7, eg about 7.15-7.25, eg 7.19-7.22 based on mg of KOH per gram (according to 98); and a nitrogen content as measured by the Kj eldahl method of below 0.1 %
by mass, eg 0.08. A typical example of such an oil composition is a 5W40 grade oil.
A feature of the oil compositions of the present invention is that they have a considerably reduced amount of the anti-wear agent, ZDDP, and hence phosphorus therein.
For instance, the conventional oil compositions have a phosphorus content of about 0.09-1.0% by weight whereas the lubricating oil composition used in conjunction with the ultra-low sulphur fuels of the present invention need only have a phosphorus content of below 0.05% by weight, eg about 0.046, which is about one-half of that used hitherto with low sulphur fuels. The ZDDP contributing towards the phosphorus content of the lubricating oils used in the present invention suitably have primary alkyl groups having.1-18 carbon atoms, secondary alkyl groups having 3-18 carbon atoms or a mixture of such primary and secondary alkyl groups.
The present invention,is further illustrated with reference to the following Examples.
EXAMPLES
The test schedule tabulated below, shows that tests were carried out using low and high sulphur (S) motor gasoline (mogas) and lube oils with low and high phosphorus (P) levels.
Low P oil (D) High P oil (C) Low S fuel (B) 3 2 High S fuel (A) 1 The tests were conducted in the order outlined in the table. Tests 1 and 2 were conducted first and after the initial data were analysed the low S fuel in combination with a low P oil was tested. The compositions of the ftiels and lubricating oils used are shown in Table 1 below:
Fuels - High S mogas A 700ppm S
- Low S mogas B 9ppm S
Thus, it has now been found that low phosphorus lubricating oils can be used in conjunction with ultra-low sulphur fuels without adversely affecting the fuel economy performance or the efficiency of the exhaust catalyst system of a vehicle.
Accordingly, the present invention is a lubricating oil composition used in conjunction with a gasoline fuel having a sulphur content of less than 10 ppm by weight, characterised in that said oil composition has a phosphorus content of no more than 0.05%
by weight. Thus in one aspect, the invention is the use in an internal combustion engine operating on gasoline fuel having a sulphur content of less than 10 ppm by weight, of a lubricating oil composition having a phosphorous content of no more than 0.05%
by weight, for the purpose of reducing environmental pollution.
The present invention will be described as set out herein with reference to Figure 1.
Figure 1 shows the wear effects for fuel/lube combinations for intermediate samples.
Further discussion is provided on page 12.
As described above, the sulphur content of the fuel composition is less than 10 ppm by weight, is preferably less than 5 ppm by weight. The sulphur measurement methods used were by X-ray (ASTM D2622-1) or by UV (ASTM D5453-93). Such low sulphur levels can be achieved in a number of ways. The base fuels may comprise mixtures of saturated, olefinic and aromatic hydrocarbons and these can be derived from straight run streams, thermally or catalytically cracked hydrocarbon feedstocks, hydrocracked petroleum fractions, catalytically reformed hydrocarbons, or synthetically produced hydrocarbon mixtures such as those derived from methane. Typically, the present invention is applicable to fuels such as the light boiling gasoline (which typically boils between 50 and 200 C), especially motor gasoline. The sulphur content of such fuels can be reduced below the 10 ppm level by well known methods such as eg, catalytic hydrodesulphurisation.
The lubricating oil compositions used in conjunction with the ultra-low sulphur fuels in the present invention are suitably Group II, Group III or Group IV
basestock as defined by the API and are preferably Group II basestock. These compositions suitably contain the conventional additives selected from the group consisting of:
phenolic and/or 2a aminic antioxidants, demulsifiers, viscosity index improvers, anti-wear agents, alkaline earth metal sulphonates, and polyisobutenyl succinimides which may optionally be borated. These oil compositions suitably have: a kinematic viscosity at 40 C
(KV40) of about 75 cSt or less, preferably from 50-75 cSt, more preferably from 60-70 cSt (eg about 66-67 cSt); a KVloo of below 20 cSt, preferably from 10-15 cSt (eg about 11 cSt); a pour point below -20 C, preferably below -30 C (eg about -33 C); a flash point of about 200 C, preferably above 215 C (eg 220 C); a NOACK volatility of up to 15% (eg 14.3%);
a TBN
value of about 7, eg about 7.15-7.25, eg 7.19-7.22 based on mg of KOH per gram (according to 98); and a nitrogen content as measured by the Kj eldahl method of below 0.1 %
by mass, eg 0.08. A typical example of such an oil composition is a 5W40 grade oil.
A feature of the oil compositions of the present invention is that they have a considerably reduced amount of the anti-wear agent, ZDDP, and hence phosphorus therein.
For instance, the conventional oil compositions have a phosphorus content of about 0.09-1.0% by weight whereas the lubricating oil composition used in conjunction with the ultra-low sulphur fuels of the present invention need only have a phosphorus content of below 0.05% by weight, eg about 0.046, which is about one-half of that used hitherto with low sulphur fuels. The ZDDP contributing towards the phosphorus content of the lubricating oils used in the present invention suitably have primary alkyl groups having.1-18 carbon atoms, secondary alkyl groups having 3-18 carbon atoms or a mixture of such primary and secondary alkyl groups.
The present invention,is further illustrated with reference to the following Examples.
EXAMPLES
The test schedule tabulated below, shows that tests were carried out using low and high sulphur (S) motor gasoline (mogas) and lube oils with low and high phosphorus (P) levels.
Low P oil (D) High P oil (C) Low S fuel (B) 3 2 High S fuel (A) 1 The tests were conducted in the order outlined in the table. Tests 1 and 2 were conducted first and after the initial data were analysed the low S fuel in combination with a low P oil was tested. The compositions of the ftiels and lubricating oils used are shown in Table 1 below:
Fuels - High S mogas A 700ppm S
- Low S mogas B 9ppm S
Table 1 Compositional analysis of test fuels TEST DESCRIPTION A B UNITS
RON 97.6 97.1 MON 85.0 89.9 DENSITY 0.766 0.733 g/ml @ 15 C
APPEARANCE Fail (partics) C&B
EXISTENT GUM 2.2 2 mg/l00m1 WASHED GUM 0.8 0 mg/l00ml DISTILLATION
IBP 25.5 32.2 C
FBP 199.5 200.7 C
E70 C 23.4 36.1 ml E100 C 41.8 56.5 ml E150 C 87.1 84.8 ml FIA
Aromatics 43.8 22 % v/v Olefins 23.2 0.5 % v/v Saturates 33 77.5 % v/v SETAVAP 654 50.9 m/bars / kPa SULPHUR - XRAY 0.07 * % wt SULPHUR - UV * 9 mg/kg BROMINE NO. 33.87 0.95 UVA 319 0.43 0.43 A/Uts LEAD CONTENT 3.4 <1 mg/l.
NITROGEN 0.3 w/w ppm Nitrogen in H/Carbons 20.7 w/w ppm MTBE by IR 0 0 % vol GC ANALYSIS
Benzene N/A 2.23 Vol%
Toluene N/A 12.56 Vol%
Xylene N/A 7.21 Vol%
CHN by COMBUSTION
Carbon N/A 87.6 %
Hydrogen N/A 12.4 %
Nitrogen N/A <0.1 %
* not measured Lube oils - High P oil - C ) both oils approximate to Low P oil - D ) 5W40 grade Tables 2-4 below show the formulation details and compositional analysis of these lube oils.
Table 2 High P Lube oil formulation (C) Component Component chemistry blend ratio PBR 9330 300 TBN Ca Sulphonate 1.55 PBR 9260 Borated PIBSA PAM MWt 2225 6 PX 14 ZDDP with sec-al,kyl groups 1.2 IRG L150 mixed phenolic/aminic Antioxidants, 1 PBR 9499 Demulsifier 0.01 PTN 8464 Viscosity Improver 8.8 IOL 120X b'stock GPII basestock 81.44 Table 3 Low P lube oil formulation (D) Component Component chemistry blend ratio PBR 9330 300 TBN Ca Sulphonate 1.55 PBR 9260 Borated PIBSA PAM MWt 2225 6 PX 14 ZDDP with sec-alkyl groups 0.6 IRG L150 mixed phenolic/aminic Antioxidants 1 PBR 9499 Demulsifier 0.01 PTN 8464 Viscosity Improver 8.8 IOL 120X b'stock GPII basestock 82.04 Table 4 Fresh oil analysis C D
Test Units High P Low P
Research oil Research oil KV40 CSt 67.3 66.32 KVIOO CSt . 11.3 11.08 Ravensfield viscosity MPa.s 3.2 EPCo CCS -25C auto MPa.s 2810 Pour point (auto) C -33 EPCo LPTV -35 C CP 21700 COC Flash point (auto) C 220 NOACK volatility % 14.3 TBN Mg KOH/g 7.19 7.22 Additive Elements Boron % wt 0.015 0;014 Barium %wt <0.001 <0.001 Calcium %wt 0.179 0.179 Copper %wt <0.001 <0.001 Magnesium %wt <0.001 <0.001 Molybdenum %wt <0.001 <0.001 Phosphorus %wt 0.093 0.046 Sulphur %wt 0.226 0.13 Silicon mg/kg 4 5 Zinc %wt 0.105 0.052 N content (Kjeldhal) lom/m 0.082 Foam stage 2 Foam after 5min blowing ml 0 Foam after 10min settling ml 0 Engine testing All engine testing was carried out;on a GM Buick 3.8L engine. The standard cycle for this engine is medium severity and has a duration of 109 hrs and the protocol used is summarised in Table 5 below using an Exxon in-house procedure:
RON 97.6 97.1 MON 85.0 89.9 DENSITY 0.766 0.733 g/ml @ 15 C
APPEARANCE Fail (partics) C&B
EXISTENT GUM 2.2 2 mg/l00m1 WASHED GUM 0.8 0 mg/l00ml DISTILLATION
IBP 25.5 32.2 C
FBP 199.5 200.7 C
E70 C 23.4 36.1 ml E100 C 41.8 56.5 ml E150 C 87.1 84.8 ml FIA
Aromatics 43.8 22 % v/v Olefins 23.2 0.5 % v/v Saturates 33 77.5 % v/v SETAVAP 654 50.9 m/bars / kPa SULPHUR - XRAY 0.07 * % wt SULPHUR - UV * 9 mg/kg BROMINE NO. 33.87 0.95 UVA 319 0.43 0.43 A/Uts LEAD CONTENT 3.4 <1 mg/l.
NITROGEN 0.3 w/w ppm Nitrogen in H/Carbons 20.7 w/w ppm MTBE by IR 0 0 % vol GC ANALYSIS
Benzene N/A 2.23 Vol%
Toluene N/A 12.56 Vol%
Xylene N/A 7.21 Vol%
CHN by COMBUSTION
Carbon N/A 87.6 %
Hydrogen N/A 12.4 %
Nitrogen N/A <0.1 %
* not measured Lube oils - High P oil - C ) both oils approximate to Low P oil - D ) 5W40 grade Tables 2-4 below show the formulation details and compositional analysis of these lube oils.
Table 2 High P Lube oil formulation (C) Component Component chemistry blend ratio PBR 9330 300 TBN Ca Sulphonate 1.55 PBR 9260 Borated PIBSA PAM MWt 2225 6 PX 14 ZDDP with sec-al,kyl groups 1.2 IRG L150 mixed phenolic/aminic Antioxidants, 1 PBR 9499 Demulsifier 0.01 PTN 8464 Viscosity Improver 8.8 IOL 120X b'stock GPII basestock 81.44 Table 3 Low P lube oil formulation (D) Component Component chemistry blend ratio PBR 9330 300 TBN Ca Sulphonate 1.55 PBR 9260 Borated PIBSA PAM MWt 2225 6 PX 14 ZDDP with sec-alkyl groups 0.6 IRG L150 mixed phenolic/aminic Antioxidants 1 PBR 9499 Demulsifier 0.01 PTN 8464 Viscosity Improver 8.8 IOL 120X b'stock GPII basestock 82.04 Table 4 Fresh oil analysis C D
Test Units High P Low P
Research oil Research oil KV40 CSt 67.3 66.32 KVIOO CSt . 11.3 11.08 Ravensfield viscosity MPa.s 3.2 EPCo CCS -25C auto MPa.s 2810 Pour point (auto) C -33 EPCo LPTV -35 C CP 21700 COC Flash point (auto) C 220 NOACK volatility % 14.3 TBN Mg KOH/g 7.19 7.22 Additive Elements Boron % wt 0.015 0;014 Barium %wt <0.001 <0.001 Calcium %wt 0.179 0.179 Copper %wt <0.001 <0.001 Magnesium %wt <0.001 <0.001 Molybdenum %wt <0.001 <0.001 Phosphorus %wt 0.093 0.046 Sulphur %wt 0.226 0.13 Silicon mg/kg 4 5 Zinc %wt 0.105 0.052 N content (Kjeldhal) lom/m 0.082 Foam stage 2 Foam after 5min blowing ml 0 Foam after 10min settling ml 0 Engine testing All engine testing was carried out;on a GM Buick 3.8L engine. The standard cycle for this engine is medium severity and has a duration of 109 hrs and the protocol used is summarised in Table 5 below using an Exxon in-house procedure:
Table 5 Engine test cycle GM Buick 3.8L engine Stage Duration Engine speed Torque min:sec Rev/min Nm 1 10:50 1700 48.8 2 15:57 1465 76.2 3 10:50 1700 48.8 4 24:08 1465 76.2 17:35 1265 36.6 6 15:57 1465 76.2 Under standard testing conditions used, the sump is flushed and filled with the oil under test ("Test oil") before the test commences. At the end of test the cylinder head is removed and the level of intake valve and combustion chamber deposits measured (visual rating and/or weights).
To test the compositions of the present invention the engine was flushed with the low P oil prior to filling and then the test was run under the standard cycle. At the end of test the engine was dismantled and rated in the normal manner and the used oil was collected for analysis. Small (ca. 50m1) oil samples were collected during the test, after 24, 48 and 72 hours, so that effects could be monitored throughout the test.
Used oil analysis - Bench test strategy Samples of the fresh and end of test (EOT) used oils were analysed for all of the tests and these are listed below (Tables 6 and 7). In addition, the intermediate samples, which were only available in limited quantities (50m1), were analysed by a limited test set (Table 6).
Table 6 Tests for all oil samples Purpose Test Volume 1 Free acid TAN 25 2 Detergency retention TBN 25 3 Anti-oYidancy DSC stepped temp 20 4 DSC isothermal 20 5 Wear Wear metals 5 Table 7 Additional tests for fresh and EOT oils Purpose Test Volume 6 Viscometric change KV40 50 7 Viscometric change KVioo 50 8 Fuel dilution Fuel dilution 30 9 Wear Additive metals 5 Results obtained are summarised in Table 8-11 below. In these Tables the concentration of metals which did not undergo any significant change as a result of the test are not reported.
In the Tables, the Wear metals by ICP tests were carried out as prescribed in and the KV values determined according to ASTM D445.
Table 8A
Endne Test IVD Results Measurement High S Fuel (A) Low S Fuel (B) IVD rating 6.3 7.5 IVD mg/valve (average) 1368 378 Table 8B
Engine test CCD Results Measurement High S Fuel (A) Low S Fuel (B) CCD mg/cylinder (average) 1256 551 PTD mg/cylinder (average) 1505 698 Total 2761 1249 Table 9 Bench test results for virgin and EOT used oils (Engine Tests 1 and 2) Lube Oil C EOT EOT
Sample Virgin oil Low S Fuel High S Fuel description Test Units Kinematic Viscosity at 40 C (ASTM D445) cSt 68.1 64.8 65.8 Kinematic Viscosity at 100 C (ASTM D445) cSt 11.3 11.0 11.0 TAN (ASTM D664) mg KOH/g 1.95 1.78 2.05 SAN (IP 182/82) mg KOH/g 0 0 0 pH 7.86 5.64 5.62 TBN (ASTM D2896) mg KOH/g 7.17 6.63 6.24 %loss 0 8 13 Fuel dilution (IP 23/83) % v/v No dilution No dilution 0.20 DSC Oxidation stability 5 C/min Degradation Temperature C 247.8 227.0 225.8 Extrapolated Onset Temperature C 250.2 233.6 230.3 Reduction in Degradation Temp C 0 16.6 19.9 ' DSC Oxidn Stability 210 C/200ml Induction time Min 53.3 19.3 12.6 Extrapolated onset time (EOT) Min 55.2 20.5 13.8 Reduction in Induction time Min 0 34 40.7.
Wear metals by ICP (ASTM D5185) Barium mg/kg <1 2 2 Chromium mg/kg, <1 <1 2 Copper mg/kg <1 4 14 Iron mg/kg <1 17 40 Molybdenum mg/kg 2 3 3 Phosphorus mg/kg >180 >180 >180 , Lead mg/kg <1 <1 3 Silicon , mg/kg 2 66 63 . Det. Used Oil Elements (ASTM D5185) Boron % wt 0.014 0.008 0.008 Magnesium %wt <0.001 <0.001 0.005 Phosphonts %Wt 0.093 0.087 0.082 Sulphur %wt 0.224 0.204 0.253 Silicon mg/kg 3 >50 >50 `? o E"~ cy r~ N M ~D - O_ d N d N p ~t p 00 N N N N~ "Lr) -' ~ V h '= d /\ N ~O
~~oo~ O v~ pp pMd'N NN 00 N N j Q h v1 ~O N h N kn ~ v) O~ 00 op - ~p c=~
'" p~O Ocq 00 CS CJ] .-+ ~ N N N N M~ .- -~ ^ N vl p oo m 0M = 'O - ~ h 0p0 \O
N -~ N N MLn n N
p. p pp p N N O O p p V V V n 00 V N
rn . .. ... . . -. .
E - V) 10)4 '-C~ O N ~n ~n G1 p 0 N c~ I-q oo M M h N M ~ V
in _ ~ N N -' N A
p~ N ~ p 00 h oo ~ d 1 p l\ in pp N N M M N n V tn y ~+ ~q ~ N ~
H,~+ F
1 N N \1O 00 00 O N _ p~ ~p M N N h M d 4 ~ N M oo tn n 00 vM 00 p tn p d~ p .- N CD p p .-, ,-i 00 .-4 N
00 h N N O p V V V n V
bA bA bA
QO O DUU o ~~_c o bnb~O tO tO
o o o ~bA-bA-bA b-bA
~E ~
~
~ .
E H
Q) a.) ., N oE E
U ~ U
n ;I~~,~,F, c o o ~ N =~ 'w =a=+ .S~
~"' ~' - C2 U ^
oNU
o ~ "C3 =t7 CS
~CS E-, Q Q ~ õp N o o .~ r-~
Z o o crvj O - p = r ~~~0~~~~3~ zZ Z o U cnb =o -Z5 U=s~~-~s a~:n -v ~
~ 0 X N N Cn ~ Y, ~U C~J o o EQ-~ C/)Ci~ Gl 0 co ci~
Table 11 Results for fresh oil, EOT oils and intermediate samples (Entzine Test 3) Low S fuel B
Fresh oil 24hrs 48hrs 72hrs EOT
Test Units TAN mg KOH/g 1.32 1.12 1.15 1.27 1.6 SAN mg KOH/g 0 0 0 0 0 pH 9.29 7.09 6.59 6.18 6.99 TBN mg KOH/g 7.22 6.84 6.71 6.44 5.76 %loss 0 6 7 11 22 DSC Oxidation stability 5 C/min Degradation Temperature C 244.8 235.6 230.1 224.4 217.6 Extrapolated Onset Temperature C 246.8 237.3 232.1 226.9 220.2 Reduction in Degradation Temp C 0 9.2 143 20.4 27.2 Reduction in Degradation Temp % 0 4 6 8 11 DSC Oxidn Stability 210 C/200m1 Induction time Min 33.7 18.6 13.3 5.8 1.2 Extrapolated onset time (EOT) Min 35.1 19.7 14.3 6.6 1.9 Reduction in Induction time Min 0 15.1 20.4 27.9 32.5 Reduction in Induction time % 0 45 61 83 96 Wear metals by ICP
Copper Mg/kg <1 7 7 8 9 Iron Mg/kg <1 5 6 6 6 Sodium Mg/kg <1 5 5 5 6 Phosphorus Mg/kg >180 >180 >180 >180 >180 Silicon Mg/kg 3 36 45 53 63 Det. Used oil Elements I
Copper %wt <0.001 <0.001 Phosphorus %wt 0.046 0.044 Sulphur %wt 0.13 0.126 Silicon Mg/kg .5 52 KV40 CSt 66.32 65.62 KV,oo CSt 11.08 10.95 Fuel dilution None Due to a complex interplay between the different fuel properties the interpretation of these data is not straightforward. For example, oil viscosity can be impacted in a number of ways, e.g. fiiel dilution can reduce viscosity while oxidation and particulate suspension can increase it. Likewise, the S content of the oil can be increased through the transfer of conlbustion products via blow-by but could be reduced through the reaction of ZDDP or through fiiel dilution. However, there are some interesting effects observed from these data.
The main observations made are suinmarised below.
Wear effects * When the high P oil was used the Fe content was higher in the used oil run on the high S mogas.
- Results for the intermediate samples were consistent with this (see Figure 1).
- Lower levels of P and Zn were measured in the same oil samples. The differences are small but are consistent and based on original oil analyses are reproducible.
* When the low P oil was tested in combination with low S mogas the level of Fe was even lower than in tests 1 and 2.
- This was somewhat surprising as the lower concentration of ZDDP should have led us to expect higher levels of Fe (vs test 2) - Other results (e.g. DSC) are consistent with lower levels of ZDDP in the oil.
* The stepwise reduction in Fe levels from test 1 to test 2 to test 3 may gire the impression of a gradual decrease in severity over time. .However, current knowledge of engine testing would not support this. Furthermore, the test engine was not ne'w at the start of this study and thus had been fiilly nin-in in earlier test work.
Anti-oYidancy * Ltibe oils nin on low S mogas retain more anti-oxidancy performance at the end of test.
- The tised oils from test 1(high S mogas) had a sli~htly lower DSC
degradation temperature and a slightly shorter induction time than the corresponding oils from test 2.
* The anti-oxidancy performance of the oil deteriorated when the ZDDP
concentration was halved. This wasto be expected since ZDDP is also known to have antioxidancy properties in addition to being an anti-wear agent. Thus, it may be necessary to supplement the amount of anti-oxidants used in the formulations for optimum performance.
Acid Neutralisation * The fuel composition may also impact the rate of TBN loss and increase in TAN but only to a small extent - The oil run on low S mogas (test 2) lost less TBN than that from test 1.
- The oil run on high S mogas (test 1) has a higher TAN than that from test 2.
- The oil from test 3 (low P oil / low S mogas) showed the largest reduction in TBN
S content .
* The S content of the used oil also appears to be influenced by the fuel composition - The oil run on high S mogas (test 1) shows a greater S increase than the fresh oil while the oil run on lower S mogas (test 2) has a slightly lesser S increase.
- When the low S mogas was run with the low P oil the EOT oil had about the same S content as the fresh oil.
Viscosity * All of the EOT oils have slightly lower viscosity than the virgin oil.
Fuel dilution * Little or no fuel dilution was observed in any of the tests.
CCD/IVD
* The high S base fiiel created a significantly higher level of deposits (CCD
and IVD) than the low S mogas.
The testing now carried out shows that:
Fuel composition does appear to impact lube oil performance in key areas. The largest effect observed was in anti-wear performance as reflected in the Fe content of the rised oil. The low S mogas caused less wear than the high S mogas. Using the low S mogas, the P content of the oil could be halved with no detrinlental effect in wear protection.
Low S mogas also appears to have less of a detrimental effect on the anti-oxidancy and acid neutralisation (TBN) performance of the oil.
To test the compositions of the present invention the engine was flushed with the low P oil prior to filling and then the test was run under the standard cycle. At the end of test the engine was dismantled and rated in the normal manner and the used oil was collected for analysis. Small (ca. 50m1) oil samples were collected during the test, after 24, 48 and 72 hours, so that effects could be monitored throughout the test.
Used oil analysis - Bench test strategy Samples of the fresh and end of test (EOT) used oils were analysed for all of the tests and these are listed below (Tables 6 and 7). In addition, the intermediate samples, which were only available in limited quantities (50m1), were analysed by a limited test set (Table 6).
Table 6 Tests for all oil samples Purpose Test Volume 1 Free acid TAN 25 2 Detergency retention TBN 25 3 Anti-oYidancy DSC stepped temp 20 4 DSC isothermal 20 5 Wear Wear metals 5 Table 7 Additional tests for fresh and EOT oils Purpose Test Volume 6 Viscometric change KV40 50 7 Viscometric change KVioo 50 8 Fuel dilution Fuel dilution 30 9 Wear Additive metals 5 Results obtained are summarised in Table 8-11 below. In these Tables the concentration of metals which did not undergo any significant change as a result of the test are not reported.
In the Tables, the Wear metals by ICP tests were carried out as prescribed in and the KV values determined according to ASTM D445.
Table 8A
Endne Test IVD Results Measurement High S Fuel (A) Low S Fuel (B) IVD rating 6.3 7.5 IVD mg/valve (average) 1368 378 Table 8B
Engine test CCD Results Measurement High S Fuel (A) Low S Fuel (B) CCD mg/cylinder (average) 1256 551 PTD mg/cylinder (average) 1505 698 Total 2761 1249 Table 9 Bench test results for virgin and EOT used oils (Engine Tests 1 and 2) Lube Oil C EOT EOT
Sample Virgin oil Low S Fuel High S Fuel description Test Units Kinematic Viscosity at 40 C (ASTM D445) cSt 68.1 64.8 65.8 Kinematic Viscosity at 100 C (ASTM D445) cSt 11.3 11.0 11.0 TAN (ASTM D664) mg KOH/g 1.95 1.78 2.05 SAN (IP 182/82) mg KOH/g 0 0 0 pH 7.86 5.64 5.62 TBN (ASTM D2896) mg KOH/g 7.17 6.63 6.24 %loss 0 8 13 Fuel dilution (IP 23/83) % v/v No dilution No dilution 0.20 DSC Oxidation stability 5 C/min Degradation Temperature C 247.8 227.0 225.8 Extrapolated Onset Temperature C 250.2 233.6 230.3 Reduction in Degradation Temp C 0 16.6 19.9 ' DSC Oxidn Stability 210 C/200ml Induction time Min 53.3 19.3 12.6 Extrapolated onset time (EOT) Min 55.2 20.5 13.8 Reduction in Induction time Min 0 34 40.7.
Wear metals by ICP (ASTM D5185) Barium mg/kg <1 2 2 Chromium mg/kg, <1 <1 2 Copper mg/kg <1 4 14 Iron mg/kg <1 17 40 Molybdenum mg/kg 2 3 3 Phosphorus mg/kg >180 >180 >180 , Lead mg/kg <1 <1 3 Silicon , mg/kg 2 66 63 . Det. Used Oil Elements (ASTM D5185) Boron % wt 0.014 0.008 0.008 Magnesium %wt <0.001 <0.001 0.005 Phosphonts %Wt 0.093 0.087 0.082 Sulphur %wt 0.224 0.204 0.253 Silicon mg/kg 3 >50 >50 `? o E"~ cy r~ N M ~D - O_ d N d N p ~t p 00 N N N N~ "Lr) -' ~ V h '= d /\ N ~O
~~oo~ O v~ pp pMd'N NN 00 N N j Q h v1 ~O N h N kn ~ v) O~ 00 op - ~p c=~
'" p~O Ocq 00 CS CJ] .-+ ~ N N N N M~ .- -~ ^ N vl p oo m 0M = 'O - ~ h 0p0 \O
N -~ N N MLn n N
p. p pp p N N O O p p V V V n 00 V N
rn . .. ... . . -. .
E - V) 10)4 '-C~ O N ~n ~n G1 p 0 N c~ I-q oo M M h N M ~ V
in _ ~ N N -' N A
p~ N ~ p 00 h oo ~ d 1 p l\ in pp N N M M N n V tn y ~+ ~q ~ N ~
H,~+ F
1 N N \1O 00 00 O N _ p~ ~p M N N h M d 4 ~ N M oo tn n 00 vM 00 p tn p d~ p .- N CD p p .-, ,-i 00 .-4 N
00 h N N O p V V V n V
bA bA bA
QO O DUU o ~~_c o bnb~O tO tO
o o o ~bA-bA-bA b-bA
~E ~
~
~ .
E H
Q) a.) ., N oE E
U ~ U
n ;I~~,~,F, c o o ~ N =~ 'w =a=+ .S~
~"' ~' - C2 U ^
oNU
o ~ "C3 =t7 CS
~CS E-, Q Q ~ õp N o o .~ r-~
Z o o crvj O - p = r ~~~0~~~~3~ zZ Z o U cnb =o -Z5 U=s~~-~s a~:n -v ~
~ 0 X N N Cn ~ Y, ~U C~J o o EQ-~ C/)Ci~ Gl 0 co ci~
Table 11 Results for fresh oil, EOT oils and intermediate samples (Entzine Test 3) Low S fuel B
Fresh oil 24hrs 48hrs 72hrs EOT
Test Units TAN mg KOH/g 1.32 1.12 1.15 1.27 1.6 SAN mg KOH/g 0 0 0 0 0 pH 9.29 7.09 6.59 6.18 6.99 TBN mg KOH/g 7.22 6.84 6.71 6.44 5.76 %loss 0 6 7 11 22 DSC Oxidation stability 5 C/min Degradation Temperature C 244.8 235.6 230.1 224.4 217.6 Extrapolated Onset Temperature C 246.8 237.3 232.1 226.9 220.2 Reduction in Degradation Temp C 0 9.2 143 20.4 27.2 Reduction in Degradation Temp % 0 4 6 8 11 DSC Oxidn Stability 210 C/200m1 Induction time Min 33.7 18.6 13.3 5.8 1.2 Extrapolated onset time (EOT) Min 35.1 19.7 14.3 6.6 1.9 Reduction in Induction time Min 0 15.1 20.4 27.9 32.5 Reduction in Induction time % 0 45 61 83 96 Wear metals by ICP
Copper Mg/kg <1 7 7 8 9 Iron Mg/kg <1 5 6 6 6 Sodium Mg/kg <1 5 5 5 6 Phosphorus Mg/kg >180 >180 >180 >180 >180 Silicon Mg/kg 3 36 45 53 63 Det. Used oil Elements I
Copper %wt <0.001 <0.001 Phosphorus %wt 0.046 0.044 Sulphur %wt 0.13 0.126 Silicon Mg/kg .5 52 KV40 CSt 66.32 65.62 KV,oo CSt 11.08 10.95 Fuel dilution None Due to a complex interplay between the different fuel properties the interpretation of these data is not straightforward. For example, oil viscosity can be impacted in a number of ways, e.g. fiiel dilution can reduce viscosity while oxidation and particulate suspension can increase it. Likewise, the S content of the oil can be increased through the transfer of conlbustion products via blow-by but could be reduced through the reaction of ZDDP or through fiiel dilution. However, there are some interesting effects observed from these data.
The main observations made are suinmarised below.
Wear effects * When the high P oil was used the Fe content was higher in the used oil run on the high S mogas.
- Results for the intermediate samples were consistent with this (see Figure 1).
- Lower levels of P and Zn were measured in the same oil samples. The differences are small but are consistent and based on original oil analyses are reproducible.
* When the low P oil was tested in combination with low S mogas the level of Fe was even lower than in tests 1 and 2.
- This was somewhat surprising as the lower concentration of ZDDP should have led us to expect higher levels of Fe (vs test 2) - Other results (e.g. DSC) are consistent with lower levels of ZDDP in the oil.
* The stepwise reduction in Fe levels from test 1 to test 2 to test 3 may gire the impression of a gradual decrease in severity over time. .However, current knowledge of engine testing would not support this. Furthermore, the test engine was not ne'w at the start of this study and thus had been fiilly nin-in in earlier test work.
Anti-oYidancy * Ltibe oils nin on low S mogas retain more anti-oxidancy performance at the end of test.
- The tised oils from test 1(high S mogas) had a sli~htly lower DSC
degradation temperature and a slightly shorter induction time than the corresponding oils from test 2.
* The anti-oxidancy performance of the oil deteriorated when the ZDDP
concentration was halved. This wasto be expected since ZDDP is also known to have antioxidancy properties in addition to being an anti-wear agent. Thus, it may be necessary to supplement the amount of anti-oxidants used in the formulations for optimum performance.
Acid Neutralisation * The fuel composition may also impact the rate of TBN loss and increase in TAN but only to a small extent - The oil run on low S mogas (test 2) lost less TBN than that from test 1.
- The oil run on high S mogas (test 1) has a higher TAN than that from test 2.
- The oil from test 3 (low P oil / low S mogas) showed the largest reduction in TBN
S content .
* The S content of the used oil also appears to be influenced by the fuel composition - The oil run on high S mogas (test 1) shows a greater S increase than the fresh oil while the oil run on lower S mogas (test 2) has a slightly lesser S increase.
- When the low S mogas was run with the low P oil the EOT oil had about the same S content as the fresh oil.
Viscosity * All of the EOT oils have slightly lower viscosity than the virgin oil.
Fuel dilution * Little or no fuel dilution was observed in any of the tests.
CCD/IVD
* The high S base fiiel created a significantly higher level of deposits (CCD
and IVD) than the low S mogas.
The testing now carried out shows that:
Fuel composition does appear to impact lube oil performance in key areas. The largest effect observed was in anti-wear performance as reflected in the Fe content of the rised oil. The low S mogas caused less wear than the high S mogas. Using the low S mogas, the P content of the oil could be halved with no detrinlental effect in wear protection.
Low S mogas also appears to have less of a detrimental effect on the anti-oxidancy and acid neutralisation (TBN) performance of the oil.
Claims (9)
1. Use in an internal combustion engine operating on gasoline fuel having a sulphur content of less than 10 ppm by weight, of a lubricating oil composition comprising a zinc dialkyldithiophosphate (ZDDP) as an anti-wear agent in an amount such that the phosphorus content of the composition is below 0.05% by weight.
2. The use according to claim 1 wherein the gasoline fuel has less than 5 ppm by weight of sulphur.
3. The use according to claim 1 or 2 wherein the lubricating oil composition comprises Group II, Group III or Group IV basestock as defined by the API.
4. The use according to any one of claims 1 to 3 wherein the lubricating oil composition is a 5W40 grade oil.
5. The use according to any one of claims 1 to 4 wherein the lubricating oil further comprises one or more additives which is a phenolic or aminic antioxidant, viscosity index improver, anti-wear agent, demulsifier, alkaline earth metal sulphonate or polyisobutenyl succinimide which is optionally borated.
6. The use according to any one of claims 1 to 5 wherein the ZDDP has primary alkyl groups having 1-18 carbon atoms, secondary alkyl groups having 3-18 carbon atoms or a mixture of such primary and secondary alkyl groups.
7. A method of operating internal combustion engines which method comprises using a lubricating oil composition in conjunction with a gasoline fuel having a sulphur content of less than 10 ppm by weight, characterised in that said lubricating oil composition comprises a zinc dialkyldithiophosphate (ZDDP) as an anti-wear agent in an amount such that the phosphorus content of the composition is below 0.05% by weight.
8. A method for reducing wear in an internal combustion engine said method comprising using a lubricating oil composition in conjunction with a gasoline fuel having a sulphur content of less than 10 ppm by weight, characterised in that said lubricating oil composition comprises a zinc dialkyldithiophosphate (ZDDP) as an anti-wear agent in an amount such that the phosphorus content of the composition is below 0.05% by weight.
9. A method of reducing environmental pollution caused by the operation of an internal combustion engine whilst also reducing wear in said engine, said method comprising using a lubricating oil composition in conjunction with a gasoline fuel having a sulphur content of less than 10 ppm by weight, characterised in that said lubricating oil composition comprising a zinc dialkyldithiophosphate (ZDDP) as an anti-wear agent in an amount such that the phosphorus content of the composition is below 0.05% by weight.
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GBGB0021041.9A GB0021041D0 (en) | 2000-08-29 | 2000-08-29 | Low phosphorus lubricating oil composition |
GB0021041.9 | 2000-08-29 | ||
PCT/EP2001/009262 WO2002018521A2 (en) | 2000-08-29 | 2001-08-10 | Low phosphorus lubricating oil composition |
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CA2420248A Expired - Fee Related CA2420248C (en) | 2000-08-29 | 2001-08-10 | Low phosphorus lubricating oil composition |
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US (1) | US20040106527A1 (en) |
EP (1) | EP1315787A2 (en) |
JP (1) | JP2004507609A (en) |
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KR100984581B1 (en) * | 2002-03-28 | 2010-10-18 | 더루우브리졸코오포레이션 | Method of operating internal combustion engine by introducing detergent into combustion chamber |
EP1403359A1 (en) * | 2002-09-13 | 2004-03-31 | Infineum International Limited | Combination of a low ash lubricating oil composition and low sulfur fuel |
US7585820B2 (en) * | 2005-07-29 | 2009-09-08 | Chevron Oronite Technology B.V. | Detergent composition for a low sulfur, low sulfated ash and low phosphorus lubricating oil for heavy duty diesel engines |
US20080125337A1 (en) * | 2006-11-29 | 2008-05-29 | Guinther Gregory H | Lubricant formulations and methods |
US8084403B2 (en) * | 2009-05-01 | 2011-12-27 | Afton Chemical Corporation | Lubricant formulations and methods |
US20140187453A1 (en) | 2012-12-28 | 2014-07-03 | Chevron Oronite LLC | Ultra-low saps lubricants for internal combustion engines |
US20140187455A1 (en) | 2012-12-28 | 2014-07-03 | Chevron Oronite LLC | Ultra-low saps lubricants for internal combustion engines |
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EP1056819B1 (en) * | 1998-07-06 | 2006-06-07 | The Lubrizol Corporation | Mixed phosphorus compounds and lubricants containing the same |
US6129835A (en) * | 1998-12-28 | 2000-10-10 | International Fuel Cells, Llc | System and method for desulfurizing gasoline or diesel fuel to produce a low sulfur-content fuel for use in an internal combustion engine |
US6074993A (en) * | 1999-10-25 | 2000-06-13 | Infineuma Usa L.P. | Lubricating oil composition containing two molybdenum additives |
US6533924B1 (en) * | 2000-02-24 | 2003-03-18 | Utc Fuel Cells, Llc | Method for desulfurizing gasoline or diesel fuel for use in an internal combustion engine |
GB2360042A (en) * | 2000-03-10 | 2001-09-12 | Exxonmobil Res & Eng Co | Low sulphur fuel composition |
US6408812B1 (en) * | 2000-09-19 | 2002-06-25 | The Lubrizol Corporation | Method of operating spark-ignition four-stroke internal combustion engine |
US6696393B1 (en) * | 2002-08-01 | 2004-02-24 | Chevron Oronite Company Llc | Methods and compositions for reducing wear in internal combustion engines lubricated with a low phosphorus content lubricating oil |
-
2000
- 2000-08-29 GB GBGB0021041.9A patent/GB0021041D0/en not_active Ceased
-
2001
- 2001-08-10 US US10/344,390 patent/US20040106527A1/en not_active Abandoned
- 2001-08-10 BR BR0113553-8A patent/BR0113553A/en not_active IP Right Cessation
- 2001-08-10 EP EP01965187A patent/EP1315787A2/en not_active Withdrawn
- 2001-08-10 MX MXPA03001736A patent/MXPA03001736A/en unknown
- 2001-08-10 CA CA2420248A patent/CA2420248C/en not_active Expired - Fee Related
- 2001-08-10 JP JP2002524024A patent/JP2004507609A/en active Pending
- 2001-08-10 WO PCT/EP2001/009262 patent/WO2002018521A2/en active Application Filing
- 2001-08-27 AR ARP010104084A patent/AR030577A1/en not_active Application Discontinuation
Also Published As
Publication number | Publication date |
---|---|
WO2002018521A2 (en) | 2002-03-07 |
AR030577A1 (en) | 2003-08-27 |
WO2002018521A3 (en) | 2002-05-10 |
US20040106527A1 (en) | 2004-06-03 |
CA2420248A1 (en) | 2002-03-07 |
GB0021041D0 (en) | 2000-10-11 |
MXPA03001736A (en) | 2005-02-17 |
BR0113553A (en) | 2003-07-29 |
JP2004507609A (en) | 2004-03-11 |
EP1315787A2 (en) | 2003-06-04 |
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