Classifications

• • 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
  • C10M107/00—Lubricating compositions characterised by the base-material being a macromolecular compound
  • C10M107/02—Hydrocarbon polymers; Hydrocarbon polymers modified by oxidation
• • 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
  • C10M171/00—Lubricating compositions characterised by purely physical criteria, e.g. containing as base-material, thickener or additive, ingredients which are characterised exclusively by their numerically specified physical properties, i.e. containing ingredients which are physically well-defined but for which the chemical nature is either unspecified or only very vaguely indicated
  • C10M171/02—Specified values of viscosity or viscosity index
• • 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
  • C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
  • C10M2205/17—Fisher Tropsch reaction products
  • C10M2205/173—Fisher Tropsch reaction products used as base material
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
  • C10N2020/00—Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
  • C10N2020/01—Physico-chemical properties
  • C10N2020/02—Viscosity; Viscosity index
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
  • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
  • C10N2030/02—Pour-point; Viscosity index

Definitions

• the invention is directed to a lubricant composition comprising a Fischer-Tropsch derived base oils and one or more additives.
• the invention is especially directed to a lubricant composition according to the so-called SAE J300 classification.
• SAE x -y compositions Such lubricant compositions are also referred to as SAE x -y compositions.
• SAE stands for Society of Automotive Engineers in the USA.
• the "x" number in such a designation is associated with a maximum viscosity requirement at low temperature for that composition as measured typically by a cold cranking simulator (VdCCS) under high shear.
• the second number "y” is associated with a kinematic viscosity requirement at 100 °C as indicated below:
• a lubricant composition comprising a Fischer-Tropsch derived base oils and one or more additives is for example described WO-A-0157166.
• the lubricant may comprise a so-called viscosity modifier polymer.
• Such an additive is typically a relatively high molecular weight component, which has a marked viscosity thickening property when blended with the other components and the base oil.
• Such high molecular weight materials are generally polymeric materials, known alternatively as viscosity modifier polymers, polymeric thickeners, or viscosity index improvers.
• O-A-0157166 discloses lubricant formulations not containing viscosity modifier polymers.
• viscosity modifier polymers in combination with lower viscosity basestocks have been found to be highly advantageous in achieving desired viscometric targets, particularly with multigrade lubricant oils.
• more widely cross-graded lubricant formulations such as the OW-40, 5W-50 and 10W-60 will normally require more of the high molecular weight polymer thickener than less widely cross-graded lubricant formulations, for example OW-20 and 10W-30 oils which will need little or none of this thickening material.
• non- viscosity modified lubricant formulation according to SAE OW-20, SAE 5W-20 and SAE 10W-30 can be obtained by blending a poly-alpha olefin and a Fischer-Tropsch derived base oil, wherein the FT-derived base oil had a kinematic viscosity at 100 °C of respectively 3.7, 4.0, 4.1 and 6.0 cSt .
• VISCOSITY MODIFIER-free lubricant formulations have been only achieved in a formulation also comprising poly-alpha olefins .
• a lubricant composition comprising a mixture of at least two Fischer-Tropsch derived base oils and one or more additives wherein one Fischer-Tropsch derived base oil has a kinematic viscosity at 100 °C of less than 7 cSt and the second Fischer-Tropsch derived base oil has a kinematic viscosity at 100 °C of more than 18 cSt .
• GDI gasoline direct injection
• SAE "xW-y" viscosity lubricant formulations wherein y-x is greater or equal than 25 can be prepared without having to add a VISCOSITY MODIFIER.
• the Fischer-Tropsch derived base oil having a kinematic viscosity at 100 °C of less than 7 cSt (also referred to as the "low viscosity component”) preferably has a pour point of less than -18 °C, more preferably less than -30 °C.
• the kinematic viscosity at 100 °C is preferably greater than 3.5 cSt and more preferably between 3.5 and 6 cSt.
• the viscosity index (VI) is preferably greater than 120, more preferably greater than 130.
• the VI will typically be less than 160.
• the Noack volatility (according to CEC L40 T87) is preferably less than 14 wt% .
• the low viscosity component may any FischerTropsch derived base oil as disclosed in for example EP-A-776959, EP-A-668342, WO-A-9721788, WO-0015736, WO-0014188, WO-0014187, WO-0014183, WO-0014179, WO-0008115, WO-9941332, EP-1029029, WO-0118156 and WO-0157166.
• the second Fischer-Tropsch derived base oil having a kinematic viscosity at 100 °C of more than 18 cSt, will also be referred to as the "high viscosity component".
• the high viscosity component has a kinematic viscosity at 100 °C of between 20 and 40 cSt and more preferably between 20 and 30 cSt .
• the pour point may suitably range between -50 and +20 °C. It has been found that the pour point of the heavy base oil is less critical and that even base oils having a pour point of above 0 °C do not negatively affect the low temperature properties of the final lubricant formulation.
• the viscosity index is preferably higher than 150 and more preferably between 160 and 190.
• the volume ratio of the low and high viscosity components in the final base oil can be determined by making use of well known blending rules which are based on the properties of the starting components and the desired SAE xW-y lubricant formulation one intends to arrive at.
• the lubricant composition suitably comprises between 65 and 95 wt% of the Fischer-Tropsch derived base oils.
• the remaining part of the composition consists of one or more additives.
• part of the lubricant composition may comprise of a second base oil, for example PAO, petroleum derived based base oil or esters. This fraction will suitably be less than 10 wt%.
• the invention is also directed to the general use of the heavy grade base oil as described above in motor oil formulations, which do not require a viscosity modifier.
• the heavy base oil may be combined with another Fischer- Tropsch derived base oil to formulate the above lubricant formulations or in combination with other base oils.
• Other base oils are for example polyalphaolefins, esters, polyalkylenes, alkylated and aromatics, and more preferably mineral oils, for example hydrocrackates and solvent-refined basestocks.
• the lubricant formulation according to the present invention preferably does not comprise a VISCOSITY MODIFIER.
• the lubricant formulation may comprise one or more other additives as for example described in the afore mentioned WO-A-0157166.
• additive types which may form part of the composition are dispersants, detergents, extreme pressure/antiwear additives, antioxidants, pour point depressants, emulsifiers, demulsifiers, corrosion inhibitors, rust inhibitors, antistaining additives and friction modifiers. Specific examples of such additives are described in for example Kirk-Othmer Encyclopedia of Chemical Technology, third edition, volume 14, pages 477-526.
• the anti-wear additive is a zinc dialkyl dithiophosphate .
• the dispersant is an ashless dispersant, for example polybutylene succinimide polyamines or Mannic base type dispersants'.
• the detergent is an over-based metallic detergent, for example the phosphonate, sulfonate, phenolate or salicylate types as described in the above referred -to
• the antioxidant is a hindered phenolic or aminic compound, for example alkylated or styrenated diphenylamines or ionol derived hindered phenols.
• suitable antifoaming agents are polydimethylsiloxanes and polyethylene glycol ethers and esters .
• a preferred process that is capable of preparing both the low viscosity base oil component and the high viscosity base oil component is described below.
• This process comprises a hydrocracking/hydro- isomerisation step on a relatively heavy feed as obtained in a Fischer-Tropsch synthesis step.
• the fraction of the effluent of said hydroprocessing step which base oil precursor fraction boils in the base oil range, is subsequently subjected to a dewaxing step. From the dewaxed effluent the low and heavy base oil component is subsequently isolated.
• the relatively heavy feed to the hydrocracking/ hydroisomerisating step has suitably a weight ratio of compounds having at least 60 or more carbon atoms and compounds having at least 30 carbon atoms of at least 0.2, preferably at least 0.4 and more preferably at least 0.55. Furthermore the feed has at least 30 wt%, preferably at least 50 wt% and more preferably at least 55 wt% of compounds having at least 30 carbon atoms.
• Such a feed preferably comprises a Fischer-Tropsch product, which in turn comprises a C20+ fraction having an ASF- alpha value (Anderson-Schulz-Flory chain growth factor) of at least 0.925, preferably at least 0.935, more preferably at least 0.945, even more preferably at least 0.955.
• the initial boiling point of the feed is preferably below 200 °C.
• the feed may also comprise process recycles and/or off-spec base oil fractions as obtained after dewaxing.
• a suitable Fischer-Tropsch synthesis process which may yield a relatively heavy Fischer-Tropsch product, is for example described in WO-A-9934917 and in AU-A-698392.
• the hydrocracking/hydroisomerisation step is suitably performed in the presence of hydrogen and a catalyst, known to one skilled in the art as being suitable for this reaction. Examples of such processes are disclosed in WO-A-0014179, EP-A-532118, EP-A-666894 and EP-A-776959.
• a typical catalyst useful for this step is for example a 0.8 wt% platinum (Pt) loaded amorphous silica-alumina catalyst having a surface area of 392 m2/g and a pore volume, measured by mercury porosimeter, of 0.59 ml/g.
• a amorphous silica alumina catalyst comprising between 2.5 and 3.5 wt% nickel (Ni) , between 0.25 and 0.35 wt% Copper (Cu) , between 65 and 75 wt% of amorphous silica-alumina, between 25 and 35 wt% alumina binder and wherein the final catalyst has a surface area of between 290 and 325 m2/g, a total pore volume (Hg) of between 0.35 and 0.45 ml/g and a compacted bulk density of between 0.58 and 0.68 g/ml.
• the hydrocracking/hydroisomerisation step is preferably performed at a reaction temperature of between 175 to 380 °C, preferably higher than 250 °C and more preferably from 300 to 370 °C.
• the pressure will typically be in the range of from 10 to 250 bara and preferably between 20 and 80 bara.
• Hydrogen may be supplied at a gas hourly space velocity of from 100 to 10000 Nl/l/hr, preferably from 500 to 5000 Nl/l/hr.
• the hydrocarbon feed may be provided at a weight hourly space velocity of from 0.1 to 5 kg/l/hr, preferably higher than 0.5 kg/l/hr and more preferably lower than 2 kg/l/hr.
• the ratio of hydrogen to hydrocarbon feed may range from 100 to 5000 Nl/kg and is preferably from 250 to 2500 Nl/kg.
• the conversion in the hydrocracking/ hydroisomerisation step as defined as the weight percentage of the feed boiling above 370 °C which reacts per pass to a fraction boiling below 370 °C, is at least 20 wt%, preferably at least 25 wt%, but preferably not more than 80 wt%, more preferably not more than 70 wt%.
• the feed as used above in the definition is the total hydrocarbon feed, including for example any recycle streams . From the effluent of the hydrocracking/ hydroisomerisation step a high boiling fraction is isolated by means of distillation, which fraction boils in the base oil range.
• base oil precursor fractions are isolated, which fractions have a boiling range corresponding to the low and high viscosity components.
• the precursor fractions are obtained in a vacuum distillation of the above referred to high boiling fraction.
• This base oil precursor fraction will suitably have an initial boiling point of between 330 and 400 °C.
• the separation is preferably performed by means of a distillation at about atmospheric conditions, preferably at a pressure of between 1.2-2 bara, wherein next to said base oil precursor fraction suitably also a gas oil, naphtha and/or kerosine fractions are isolated.
• the base oil precursor fraction is subsequently subjected to a dewaxing step (also referred to as a pour point reducing treatment) .
• the dewaxing step can be performed by means of a so-called solvent dewaxing process hydrocracking/hydroisomerisation step as for example described in Lubricant Base Oil and Wax Processing, Avilino Sequeira, Jr, Marcel Dekker Inc., New York, 1994, Chapter 7.
• the dewaxing step is performed by means of a catalytic dewaxing step.
• Catalytic dewaxing is well known to the skilled reader and is suitably performed in the presence of hydrogen and a suitable heterogeneous catalysts comprising a molecular sieve and optionally in combination with a metal having a hydrogenation function, such as the Group VIII metals.
• Molecular sieves and more suitably intermediate pore size zeolites, have shown a good catalytic ability to reduce the pour point of a base oil precursor fraction under catalytic dewaxing conditions.
• the intermediate pore size zeolites have a pore diameter of between 0.35 and 0.8 nm.
• Suitable intermediate pore size zeolites are mordenite, ZSM-5, ZSM-12, ZSM-22, ZSM-23, SSZ-32, ZSM-35 and ZSM-48.
• Another preferred group of molecular sieves are the silica-aluminaphosphate (SAPO) materials of which SAPO-11 is most preferred as for example described in US-A-4859311.
• SAPO silica-aluminaphosphate
• ZSM-5 may optionally be used in its HZSM-5 form in the absence of any Group VIII metal.
• the other molecular sieves are preferably used in combination with an added Group VIII metal.
• Suitable Group VIII metals are nickel, cobalt, platinum and palladium. Examples of possible combinations are
• Ni/ZSM-5, Pt/ZSM-23, Pd/ZSM-23, Pt/ZSM-48 and Pt/SAPO-11 Further details and examples of suitable molecular sieves and dewaxing conditions are for example described in WO-A-9718278, US-A-5053373, US-A-5252527 , US-A-4574043, US-A-5157191, WO-A-0029511, EP-A-832171.
• Catalytic dewaxing conditions typically involve operating temperatures in the range of from 200 to 500 °C, suitably from 250 to 400 °C, hydrogen pressures in the range of from 10 to 200 bar, preferably from 40 to 70 bar, weight hourly space velocities (WHSV) in the range of from 0.1 to 10 kg of oil per litre of catalyst per hour (kg/l/hr), suitably from 0.2 to 5 kg/l/hr, more suitably from 0.5 to 3 kg/l/hr and hydrogen to oil ratios in the range of from 100 to 2,000 litres of hydrogen per litre of oil.
• WHSV weight hourly space velocities
• the temperature between 275 and more preferably between 315 and 375 °C at between 40-70 bars, in the catalytic dewaxing step it is possible to prepare the low viscosity base oil component having pour point values varying suitably from below -60 up to -10 °C.
• lower boiling non-base oil fractions are suitably first removed, preferably by means of distillation, optionally in combination with an initial flashing step.
• the dewaxed product is separated, suitably by means of distillation, into at least the low and high viscosity base oil components.
• the high viscosity base oil component will suitably be the bottom product (or in other words: the highest boiling fraction) of such a distillation.
• the feed contained about 60 wt% C30+ product.
• the ratio Cgo + c 30 + was about 0.55.
• the hydrocracking step the fraction was contacted with a hydrocracking catalyst of Example 1 of EP-A-532118.
• the effluent of step (a) was continuously distilled under vacuum to give lights, fuels and a residue "R" boiling from 370 °C and above.
• the yield of gas oil fraction on fresh feed to hydrocracking step was 43 wt%.
• the properties of the gas oil thus obtained are presented in Table 3.
• the main part of the residue "R” was recycled to step and a remaining part was sent to a catalytic dewaxing step.
• the conditions in the hydrocracking step were: a fresh feed Weight Hourly Space Velocity (WHSV) of
• the fraction described above boiling from 370 °C to above 750 °C was contacted with a dealuminated silica bound ZSM-5 catalyst comprising 0.7% by weight Pt and 30 wt% ZSM-5 as described in Example 9 of WO-A-0029511.
• the dewaxed oil was distilled into three base oil fractions boiling between 305 and 420 °C (yield based on feed to dewaxing step was 16.1 wt%), between 420-510 °C (yield based on feed to dewaxing step was 16.1 wt%) and a fraction boiling above 510 °C (yield based on feed to dewaxing step was 27.9 wt%) .
• the base oil fraction boiling between 420 and 510 °C and the heavier fraction was analysed in more detail (see Table 1) .
• MT Type zeolite crystallites were prepared as described in "Verified synthesis of zeolitic materials” as published in Micropores and mesopores materials, volume 22 (1998), pages 644-645 using tetra ethyl ammonium bromide as the template.
• the Scanning Electron Microscope (SEM) visually observed particle size showed ZSM-12 particles of between 1 and 10 ⁇ m.
• the average crystallite size as determined by XRD line broadening technique was 0.05 ⁇ m.
• the crystallites thus obtained were extruded with a silica binder (10% by weight of zeolite, 90% by weight of silica binder) .
• the extrudates were dried at 120 °C.
• a solution of (NH ⁇ SiFg (45 ml of 0.019 N solution per gram of zeolite crystallites) was poured onto the extrudates. The mixture was then heated at 100 °C under reflux for 17 h with gentle stirring above the extrudates. After filtration, the extrudates were washed twice with deionised water, dried for 2 hours at 120 °C and then calcined for 2 hours at 480 °C.
• extrudates were impregnated with an aqueous solution of platinum tetramine hydroxide followed by drying (2 hours at 120 °C) and calcining (2 hours at 300 °C) .
• the catalyst was activated by reduction of the platinum under a hydrogen rate of 100 1/hr at a temperature of 350 °C for 2 hours.
• the resulting catalyst comprised 0.35% by weight Pt supported on the dealuminated, silica-bound MTW zeolite.
• a partly isomerized Fischer-Tropsch derived wax having the properties as in Table 2 was distilled into a light base oil precursor fraction boiling substantially between 390 and 520 °C and a heavy base oil precursor fraction boiling above 520 °C.
• the heavy base oil precursor fraction was contacted with the above-described dewaxing catalyst.
• the dewaxed oil was distilled into two base oil fractions having the properties listed in Table 3.
• the light base oil precursor fraction was also catalytically dewaxed by contacting with the above described dewaxing catalyst.
• the dewaxed oil was distilled into two base oil fractions having the properties listed in Table 4.
• Example 2 was repeated starting party isomerized FischerTropsch derived wax having the properties as listed in Table 5. This feed was distilled into a light base oil precursor fraction boiling substantially between 390 and 520 °C and a heavy base oil precursor fraction boiling above 520 °C.
• the heavy base oil precursor fraction was contacted with the above-described dewaxing catalyst.
• the dewaxed oil was distilled into two base oil fractions having the properties listed in Table 6.
• This example illustrates the use of a heavy FischerTropsch derived base oil grade as part of a 5W-30 lubricant composition according to the so-called SAE J300 classification without having to use a viscosity modifier.
• the properties of the Fischer-Tropsch derived base oils and the resulting lubricant are presented in Table 7.

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  • 2003-06-25 WO PCT/EP2003/006758 patent/WO2004003113A1/en active Application Filing
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