EP0743351B1 - Procédé de préparation d'huiles de base lubrificante - Google Patents

Procédé de préparation d'huiles de base lubrificante Download PDF

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Publication number
EP0743351B1
EP0743351B1 EP19960201338 EP96201338A EP0743351B1 EP 0743351 B1 EP0743351 B1 EP 0743351B1 EP 19960201338 EP19960201338 EP 19960201338 EP 96201338 A EP96201338 A EP 96201338A EP 0743351 B1 EP0743351 B1 EP 0743351B1
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EP
European Patent Office
Prior art keywords
catalyst
stage
process according
hydroconversion
metal component
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Expired - Lifetime
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EP19960201338
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German (de)
English (en)
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EP0743351A3 (fr
EP0743351A2 (fr
Inventor
Jean-Pierre Gilson
Pierre Grandvallet
Peter James Wardle
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Shell Internationale Research Maatschappij BV
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Shell Internationale Research Maatschappij BV
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Publication of EP0743351A3 publication Critical patent/EP0743351A3/fr
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
    • C10G65/00—Treatment of hydrocarbon oils by two or more hydrotreatment processes only
    • C10G65/02—Treatment of hydrocarbon oils by two or more hydrotreatment processes only plural serial stages only
    • C10G65/04—Treatment of hydrocarbon oils by two or more hydrotreatment processes only plural serial stages only including only refining steps
    • C10G65/08—Treatment of hydrocarbon oils by two or more hydrotreatment processes only plural serial stages only including only refining steps at least one step being a hydrogenation of the aromatic hydrocarbons

Definitions

  • the present invention relates to a process for the preparation of a lubrication base oil, which process involves two successive hydroconversion stages.
  • first stage catalysts normally comprise a Group VIII non-noble metal component and a Group VIB metal component on a refractory oxide support.
  • Suitable second stage catalysts comprise a Group VIII noble metal component, optionally together with a Group VIB metal component, on an refractory oxide support.
  • platinum and/or palladium either in elemental form or as oxide or sulphide, are disclosed to be useful.
  • refractory oxide support aluminosilicates (zeolitic materials) as well as inorganic oxides (such as e.g. silica, alumina and amorphous silica-alumina) or mixtures thereof may be applied.
  • zeolitic materials zeolitic materials
  • inorganic oxides such as e.g. silica, alumina and amorphous silica-alumina
  • the first stage operating temperature leaves room for improvement. Due to the relatively high operating temperature applied in the first hydroconversion stage, namely, the formation of polynuclear aromatic compounds in this first stage is favoured. These polynuclear aromatic compounds formed must then be removed in the second stage, which implies that hydroconversion conditions in this second stage should be sufficiently severe to hydrogenate and/or hydrocrack said polynuclear polyaromatic compounds. On the other hand, decreasing the first stage operating temperature will result in less conversion of the feedstock into valuable products, which is undesired from an economic perspective.
  • the present invention aims to provide a two stage hydroconversion process for preparing lubricating base oils, whereby the first stage can be operated at a lower operating temperature than conventionally applied, whilst still obtaining products having an excellent viscosity index at a commercially attractive yield. It will be evident that such a process will put less stringent demands on the equipment to be used and hence can be operated at lower operating costs, whilst still maintaining a commercially attractive yield. Moreover, less formation of polynuclear aromatic species also implies that less of these species will remain in the final base oil, which is desired from both environmental and base oil quality considerations. Thus, the present invention aims to provide an improved two stage hydroconversion process for preparing lubricating base oils. More specifically, the present invention aims to provide a process for the preparation of a lubricating base oil, which process allows the production of high viscosity index lubricating base oils at less demanding operating conditions, whilst still having a commercially attractive yield.
  • the present invention relates to a process for the preparation of a lubricating base oil comprising the steps of:
  • Suitable hydrocarbon oil feeds to be employed in step (a) of the process according to the present invention are mixtures of high-boiling hydrocarbons, such as for instance heavy oil fractions.
  • Particularly those heavy oil fractions having a boiling range which is at least partly above the boiling range of lubricating base oils are suitable as hydrocarbon oil feeds for the purpose of the present invention.
  • the boiling range of such a vacuum distillate fraction is usually between 300 and 620 °C, suitably between 350 and 550 °C.
  • deasphalted residual oil fractions including both deasphalted atmospheric residues and deasphalted vacuum residues
  • synthetic waxy raffinates Fischer-Tropsch waxy raffinates
  • slack waxes particularly those obtained from the dewaxing of hydrotreated waxy distillates- and hydrocracker bottom fractions (hydrowax) are also suitable feedstocks to be used in the process according to the present invention.
  • Suitable hydrowaxes are those having an effective cutpoint of 320 °C or higher, preferably of 370 °C or higher.
  • the catalyst to be used in the first hydroconversion stage is a Group VIII noble metal-based catalyst. If a hydrocarbon oil feed is used which is not substantially free of sulphur- and nitrogen-containing compounds, this catalyst should be sulphided prior to operation in order to attain optimum catalyst activity and in order to ensure that the catalyst is sufficiently tolerant towards the sulphur- and nitrogen-containing compounds present in the feed. If the catalyst would not be sulphided in this case, its sulphur-tolerance would be too low under the operating conditions and the catalyst would consequently be rapidly poisoned when contacted with the hydrocarbon oil feed under the operating conditions.
  • Sulphiding of the catalyst can be achieved by methods known in the art, such as for instance from European patent applications Nos. 0,181,254; 0,329,499; 0448,435 and 0,564,317 and from International patent applications Nos. WO 93/02793 and WO 94/25157.
  • Sulphiding can be performed either ex situ or in situ by contacting the unsulphided catalyst with a suitable sulphiding agent, such as hydrogen sulphide.
  • a suitable sulphiding agent such as hydrogen sulphide.
  • a hydrocarbon oil containing a substantial amount of sulphur-containing compounds may also be used as the sulphiding agent. Such oil is then contacted with the catalyst at a temperature which is gradually increased from ambient temperature to a temperature of between 150 and 250 °C.
  • the catalyst is to be maintained at this temperature for between 10 and 20 hours. Subsequently, the temperature is to be raised gradually to the operating temperature. Still another option is to use the hydrocarbon oil feed, which usually contains a significant amount of sulphur-containing compounds, as the sulphiding agent. In this case the unsulphided catalyst may be contacted with the feed under conditions less severe than the operating conditions, thus causing the catalyst to become sulphided.
  • the hydrocarbon oil feed should comprise at least 0.5% by weight of sulphur- containing compounds, said weight percentage indicating the amount of elemental sulphur relative to the total amount of feedstock, in order to be useful as a sulphiding agent. From a cost and efficiency perspective, it is generally preferred to sulphide the catalyst in situ, i.e. first loading the unsulphided catalyst into a reactor and thereafter contacting it with the sulphiding agent(s) under appropriate sulphiding conditions.
  • the refractory oxide support of the first stage hydrotreating catalyst may be any inorganic oxide, aluminosilicate or combination of these, optionally in combination with an inert binder material.
  • suitable refractory oxides include inorganic oxides, such as alumina, silica, titania, zirconia, boria, silica-alumina, fluorided alumina, fluorided silica-alumina and mixtures of two or more of these.
  • an acidic carrier such as alumina, silica-alumina or fluorided alumina is used as the refractory oxide carrier.
  • the refractory oxide support may also be an aluminosilicate.
  • aluminosilicates Both synthetic and naturally occurring aluminosilicates may be used. Examples are zeolite beta, faujasite and zeolite Y. A preferred aluminosilicate to be applied is alumina- or silica-bound zeolite Y.
  • the Group VIII noble metal component of the first stage hydroconversion catalyst suitably is a platinum (Pt) and/or a palladium (Pd) component. If the catalyst is sulphided prior to operation, the noble metal component will usually be present as a sulphide during normal operation, but part of it may very well be present in elemental and/or oxide form. Beside the Group VIII noble metal component, a non-noble Group VIII metal component and/or a Group VIB metal component may be present as well on the catalyst. Accordingly, nickel (Ni), cobalt (Co) and/or chromium (Cr), molybdenum (Mo) or tungsten (W) -suitably in their sulphide form- may also be present on the catalyst.
  • Ni nickel
  • Co cobalt
  • Cr chromium
  • Mo molybdenum
  • W tungsten
  • tungsten and chromium are preferred.
  • first stage catalysts are those noble metal based-catalysts disclosed in European Patent Application No. 0,653,242 and International Patent Application No. WO 96/03208.
  • suitable catalysts include PdCr and PdW on silica-bound zeolite Y, on alumina-bound zeolite Y, on fluorided alumina-bound zeolite Y, on silica-alumina or on fluorided alumina.
  • Pt on silica-alumina PtPd on silica-bound zeolite Y
  • PtPd on alumina-bound zeolite Y and PtPd on silica-alumina All catalysts mentioned preferably are sulphided prior to operation.
  • Particularly preferred first stage catalysts are sulphided PdW on silica- or alumina-bound zeolite Y, sulphided PdW on silica-alumina and sulphided PdW on fluorided alumina.
  • the second hydroconversion stage, i.e. step (b), of the process according to the present invention may involve hydrogenation, hydrodesulphurisation, hydrodenitrogenation, hydroisomerisation of paraffinic molecules and any combination of two or more of these processes, depending on the type of hydroconversion catalyst used. Hydrocracking of paraffinic molecules may also occur in step (b), but only as a (minor) side reaction to one or more of the hydroconversion reactions mentioned above. Accordingly, the hydroconversion catalyst to be used in step (b) will not be a catalyst specifically suited for hydrocracking of paraffinic molecules.
  • the hydroconversion catalyst used in step (b) of the process according to the present invention i.e. the second stage catalyst, in principle may be any catalyst known to be active in the hydrogenation, hydrodesulphurisation, hydrodenitrogenation and/or hydroisomerisation of the relevant hydrocarbons with the purpose of manufacturing lubricating base oils.
  • a first class of suitable second stage catalysts are the hydrogenation catalysts comprising at least one Group VIII metal component and optionally at least one Group VIB metal component as the hydrogenating component(s).
  • Such catalysts have hydrogenation activity and may also have hydrodesulphurisation and/or hydrodenitrogenation activity. Usually they do not possess any relevant hydroisomerisation activity.
  • Suitable Group VIII metal components include both noble and non-noble metals and/or compounds thereof, usually oxides and/or sulphides.
  • the second stage catalyst may accordingly comprise one or more of the non-noble Group VIII metals nickel (Ni) or cobalt (Co) and/or one or more of the noble Group VIII metals Pt and Pd.
  • this catalyst is suitably at least partly sulphided prior to operation in order to increase its sulphur tolerance. It will be understood that the extent of sulphidation depends on the sulphur content of the first stage effluent. At sufficiently low sulphur content of the first stage effluent, sulphidation of a second stage noble metal-based catalyst may be dispensed with.
  • the second stage catalyst may also comprise a Group VIB metal component, which may be Cr, Mo and/or W in elemental, oxide and/or sulphide form.
  • the second stage catalyst support also is an refractory oxide support and includes the same supports as listed above for the first stage catalyst.
  • the second stage catalyst comprises a non-noble Group VIII metal, it may be advantageous to use phosphorus (P) as a promoter.
  • suitable second stage catalysts include NiMo(P) on alumina or fluorided alumina, CoMo(P) on alumina, NiW on fluorided alumina, PdW on silica-alumina, fluorided alumina or silica-bound zeolite Y.
  • a second class of suitable second stage catalysts are those catalysts having predominantly hydroisomerisation activity. These catalysts are used, if the main objective of step (b) is to lower the pour point of the first stage effluent, i.e. dewaxing.
  • Hydroisomerisation catalysts are well known in the art and usually are based on an intermediate pore size zeolitic material, suitably comprising at least one Group VIII metal component, preferably Pt and/or Pd.
  • Suitable zeolitic materials include ZSM-5, ZSM-22, ZSM-23, ZSM-35, SSZ-32, ferrierite, zeolite beta, mordenite and silica-aluminophosphates, such as SAPO-11 and SAPO-31.
  • hydroisomerisation catalysts examples include, for instance, described in International Patent Application No. WO 92/01657. Since hydroisomerisation catalysts generally are relatively quickly poisoned by sulphur-containing compounds, the first stage effluent must have a low sulphur content prior to entry in the second stage.
  • first and second stage catalyst may vary between wide limits.
  • a Group VIII noble metal may suitably be present on first and second stage catalyst in an amount ranging from 0.1 to 10, preferably 0.2 to 5, percent by weight (% wt), which weight percentage indicates the amount of metal (calculated as element) relative to total weight of catalyst.
  • a non-noble Group VIII metal may suitably be present on the second stage catalyst in an amount of from 1 to 25% wt, preferably 2 to 15% wt, calculated as element relative to total weight of catalyst.
  • a Group VIB metal is suitably present on first and second stage in an amount of from 5 to 30% wt, preferably 10 to 25% wt, calculated as element relative to total weight of catalyst.
  • Operating conditions in the first and second hydroconversion stage are those conventionally applied in the relevant hydroconversion operations. Accordingly, the operating temperature may range from 250 to 500 °C, the operating pressure may range from 10 to 250 bar, the weight hourly space velocity (WHSV) may range from 0.1 to 10 kg of oil per litre of catalyst per hour (kg/l.h), preferably from 0.5 to 5 kg/l.h, and the hydrogen to oil ratio is suitably in the range from 100 to 2,000 litres of hydrogen per litre of oil.
  • WHSV weight hourly space velocity
  • the first stage catalyst used in accordance with the present invention allows a lower first stage operating temperature, thus reducing the amount of polynuclear aromatic species formed in this first hydroconversion stage and hence allowing less severe conditions in the second hydroconversion stage.
  • an activity gain in the first hydrotreatment stage of only three degrees Celsius may already significantly reduce the amount of polynuclear aromatics formed.
  • the liquid effluent of the first stage may first be treated to remove undesired gaseous species, such as hydrogen sulphide (H 2 S) and ammonia (NH 3 ).
  • H 2 S hydrogen sulphide
  • NH 3 ammonia
  • H 2 S may, for instance, be removed by absorption in an aqueous amine solution.
  • a di-isopropanolamine solution is very useful in this respect.
  • a preferred option is to remove H 2 S and NH 3 simultaneously from the first stage effluent by passing said effluent through a high pressure stripper prior to introduction into the second stage.
  • the second stage catalyst suitably comprises a Pt and/or a Pd component as the Group VIII metal component.
  • This catalyst may further comprise a Group VIB metal component, preferably based on W or Cr. In this mode of operation it may be advantageous to use the same noble metal-based catalyst in the first and second hydroconversion stage.
  • H 2 S and NH 3 are not removed from the first stage effluent, whereas the feed used is not substantially free of any sulphur-and/or nitrogen-containing compounds, it is preferred to use a second stage catalyst comprising a nickel or cobalt component as the Group VIII metal component and a molybdenum or tungsten component as the Group VIB metal component. Suitable examples of any of these catalysts have already been described above.
  • Step (c) Recovery of the lubricating base oil(s) in step (c) is usually attained by distillation of the second stage effluent. Each lubricating base oil is then recovered as a distillate fraction. Suitably the distillation is carried out under reduced pressure. However, atmospheric distillation may also be applied. The cutpoint(s) of the distillate fraction(s) is/are selected such that each base oil recovered has the desired viscosity.
  • the second stage catalyst is a hydrogenation catalyst having no or hardly any hydroisomerisation activity
  • a subsequent dewaxing step (d) is required to obtain lubricating base oils having sufficiently low pour points.
  • Dewaxing can be achieved by catalytic dewaxing or solvent dewaxing. Both dewaxing techniques are well known in the art.
  • suitable catalysts for use in catalytic dewaxing include catalysts based on ZSM-5, ZSM-23 or ZSM-35. Suitable dewaxing catalysts and dewaxing processes are for instance described in U.S. Patents Nos.
  • Solvent dewaxing is also a well known dewaxing process.
  • the most commonly applied solvent dewaxing process is the methyl ethyl ketone (MEK) solvent dewaxing route, wherein MEK is used as the dewaxing solvent, possibly in admixture with toluene.
  • MEK methyl ethyl ketone
  • step (c) If the second stage catalyst is a hydroisomerisation catalyst, then a separate dewaxing step after step (c) can be dispensed with.
  • the lubricating base oil(s) obtained in step (c) in this case meet the specifications with respect to both viscosity index and pour point and accordingly no further pour point lowering treatment is necessary in that case.
  • the first stage effluent must have a sufficiently low sulphur content before being contacted with a hydroisomerisation catalyst.
  • step (a) If the hydrocarbon oil feed used in step (a) is a hydrowax or a synthetic waxy raffinate, which usually have low sulphur and nitrogen contents, then an interstage treatment for removing H 2 S and NH 3 can be dispensed with and the first stage effluent can be directly passed to step (b). If, on the other hand, the hydrocarbon oil feed used in step (a) has relatively high sulphur and nitrogen contents, such as in the case of vacuum distillates of atmospheric residues, then an interstage removal of H 2 S and NH 3 is required.
  • the lubricating base oils eventually produced using the process according to the present invention have a viscosity index of at least 80, preferably at least 90 and more preferably at least 95, and a pour point of -6 °C or lower and preferably -9 °C or lower.
  • a hydrocarbon oil vacuum distillate obtained by vacuum flashing of an atmospheric residue and having the properties as indicated in Table I was contacted in a first step with hydrogen in the presence of a presulphided catalyst comprising 4.3% wt Pd and 21.9% wt of W (both calculated as element relative to total weight of catalyst) on a fluorided alumina carrier (4.4% wt F, basis total carrier).
  • the effluent of the first step was subsequently contacted in the second step with hydrogen in the presence of a conventional NiMoP/alumina catalyst (3.0% wt Ni, 13.0% wt Mo, 3.2% wt P, all calculated as element relative to total weight of catalyst).
  • the process according to the present invention requires a lower temperature in the first step, wherein the noble metal-based catalyst is used, whilst still obtaining a product having better VI and viscosity at a higher yield.

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  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
  • Catalysts (AREA)

Claims (12)

  1. Procédé de préparation d'une huile de base lubrifiante comprenant les étapes suivantes :
    (a) la mise en contact d'une alimentation d'huile hydrocarbonée dans un premier stade avec de l'hydrogène en présence d'un catalyseur comprenant au moins un composant de métal noble du Groupe VIII et au moins un composant de métal du Groupe VIB sur un support d'oxyde réfractaire;
    (b) la mise en contact de l'effluent liquide dans un second stade avec de l'hydrogène en présence d'un catalyseur d'hydroconversion comprenant au moins un composant de métal du Groupe VIII sous des conditions d'hydroconversion, et
    (c) la récupération d'au moins une huile de base lubrifiante ayant un indice de viscosité d'au moins 80.
  2. Procédé suivant la revendication 1, dans lequel le catalyseur de premier stade comprend un composant de platine et/ou de palladium comme composant de métal noble du Groupe VIII.
  3. Procédé suivant l'une ou l'autre des revendications 1 et 2, dans lequel le catalyseur de premier stade comprend un composant de tungstène ou de chrome comme composant de métal du Groupe VIB.
  4. Procédé suivant l'une quelconque des revendications 1 à 3, dans lequel le catalyseur de premier stade est sulfuré.
  5. Procédé suivant la revendication 4, dans lequel le catalyseur de premier stade est un PdW sulfuré sur zéolite Y liée à de la silice ou de l'alumine, un PdW sulfuré sur silice-alumine ou un PdW sulfuré sur alumine fluorurée.
  6. Procédé suivant l'une quelconque des revendications 1 à 5, dans lequel le catalyseur d'hydroconversion utilisé dans l'étape (b) comprend de plus au moins un composant de métal du Groupe VIB.
  7. Procédé suivant l'une quelconque des revendications 1 à 6, dans lequel le catalyseur d'hydroconversion utilisé dans l'étape (b) est un catalyseur d'hydrogénation n'ayant pas ou guère d'activité d'hydroisomérisation et de plus comprenant l'étape de (d) soumettre l'huile ou les huiles lubrifiantes récupérées dans l'étape (c) à un traitement de déparaffinage.
  8. Procédé suivant l'une quelconque des revendications 1 à 6, dans lequel le catalyseur d'hydroconversion utilisé dans l'étape (b) est un catalyseur d'hydroisomérisation.
  9. Procédé suivant l'une quelconque des revendications 1 à 8, dans lequel l'effluent liquide de l'étape (a) est d'abord traité pour séparer l'hydrogène sulfuré et l'ammoniac avant d'être mis en contact avec de l'hydrogène dans l'étape (b).
  10. Procédé suivant la revendication 9, dans lequel l'hydrogène sulfuré et l'ammoniac sont séparés en faisant passer ledit effluent dans un épurateur à haute pression.
  11. Procédé suivant l'une quelconque des revendications 1 à 10, dans lequel l'alimentation d'huile hydrocarbonée est une fraction de distillat sous vide provenant d'un résidu atmosphérique.
  12. Procédé suivant l'une quelconque des revendications 1 à 6, dans lequel l'alimentation d'huile hydrocarbonée est une hydrocire ou un raffinat cireux synthétique et l'effluent de l'étape (a) est directement amené à l'étape (b), dans laquelle le catalyseur d'hydroconversion est un catalyseur d'hydroisomérisation.
EP19960201338 1995-05-19 1996-05-15 Procédé de préparation d'huiles de base lubrificante Expired - Lifetime EP0743351B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP19960201338 EP0743351B1 (fr) 1995-05-19 1996-05-15 Procédé de préparation d'huiles de base lubrificante

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP95401178 1995-05-19
EP95401178 1995-05-19
EP19960201338 EP0743351B1 (fr) 1995-05-19 1996-05-15 Procédé de préparation d'huiles de base lubrificante

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EP0743351A2 EP0743351A2 (fr) 1996-11-20
EP0743351A3 EP0743351A3 (fr) 1997-01-22
EP0743351B1 true EP0743351B1 (fr) 2000-08-09

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8557106B2 (en) 2010-09-30 2013-10-15 Exxonmobil Research And Engineering Company Hydrocracking process selective for improved distillate and improved lube yield and properties

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5976353A (en) * 1996-06-28 1999-11-02 Exxon Research And Engineering Co Raffinate hydroconversion process (JHT-9601)
AU724570B2 (en) * 1996-07-15 2000-09-28 Chevron U.S.A. Inc. Base stock lube oil manufacturing process
JP2000515198A (ja) * 1996-08-01 2000-11-14 シエル・インターナシヨネイル・リサーチ・マーチヤツピイ・ベー・ウイ 水素処理法
US6096189A (en) * 1996-12-17 2000-08-01 Exxon Research And Engineering Co. Hydroconversion process for making lubricating oil basestocks
US6099719A (en) * 1996-12-17 2000-08-08 Exxon Research And Engineering Company Hydroconversion process for making lubicating oil basestocks
FR2805276B1 (fr) * 2000-02-23 2004-10-22 Inst Francais Du Petrole Procede de conversion d'hydrocarbures sur catalyseur a acidite controlee
US6569318B2 (en) 2000-02-23 2003-05-27 Institut Francais Du Petrole Process for conversion of hydrocarbons on a catalyst with controlled acidity
WO2014098820A1 (fr) 2012-12-19 2014-06-26 Exxonmobil Research And Engineering Company Catalyseur d'hydrocraquage mésoporeux de type zéolithe y et procédés d'hydrocraquage associés

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Publication number Priority date Publication date Assignee Title
US3673078A (en) * 1970-03-04 1972-06-27 Sun Oil Co Process for producing high ur oil by hydrogenation of dewaxed raffinate
EP0323092B1 (fr) * 1987-12-18 1992-04-22 Exxon Research And Engineering Company Procédé d'hydro-isomérisation de la cire de Fischer-Tropsch en vue de la production d'une huile lubrifiante
DE3874510T2 (de) * 1987-12-18 1993-03-18 Exxon Research Engineering Co Verfahren zur stabilisierung von hydroisomeraten.
US5275719A (en) * 1992-06-08 1994-01-04 Mobil Oil Corporation Production of high viscosity index lubricants

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8557106B2 (en) 2010-09-30 2013-10-15 Exxonmobil Research And Engineering Company Hydrocracking process selective for improved distillate and improved lube yield and properties
US9487714B2 (en) 2010-09-30 2016-11-08 Exxonmobil Research And Engineering Company Hydrocracking process selective for improved distillate and improved lube yield and properties

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EP0743351A3 (fr) 1997-01-22
EP0743351A2 (fr) 1996-11-20

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