EP0668342B1 - Verfahren zur Herstellung von Basisschmieröl - Google Patents

Verfahren zur Herstellung von Basisschmieröl Download PDF

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Publication number
EP0668342B1
EP0668342B1 EP19950200281 EP95200281A EP0668342B1 EP 0668342 B1 EP0668342 B1 EP 0668342B1 EP 19950200281 EP19950200281 EP 19950200281 EP 95200281 A EP95200281 A EP 95200281A EP 0668342 B1 EP0668342 B1 EP 0668342B1
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Prior art keywords
catalyst
alumina
silica
hydrogen
hydroconversion
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French (fr)
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EP0668342A1 (de
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Jacobus C/O Shell Nederland Raffin. B.V. Eilers
Jean-Pierre Gilson
Arend Hoek
Sytze Abel Posthuma
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Shell Internationale Research Maatschappij BV
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Shell Internationale Research Maatschappij BV
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    • 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
    • C10G65/12—Treatment of hydrocarbon oils by two or more hydrotreatment processes only plural serial stages only including cracking steps and other hydrotreatment steps
    • 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
    • C10G65/043—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 change in the structural skeleton

Definitions

  • the present invention relates to a process for the preparation of lubricating base oils, in particular the preparation of very high viscosity index lubricating base oils from a mixture of carbon monoxide and hydrogen.
  • very high viscosity index refers to a viscosity index (VI) above 135, as determined by ASTM-D-2270.
  • Fischer-Tropsch synthesis The preparation of hydrocarbons from a mixture comprising carbon monoxide and hydrogen by contacting the mixture with a suitable synthesis catalyst at elevated temperatures and pressures is known in the art as the Fischer-Tropsch synthesis. It is known in the art to apply Fischer-Tropsch synthesis processes in the preparation of a range of principally aliphatic hydrocarbons having a wide range of molecular weights.
  • US patent specification No. 4 478 955 discloses a process scheme comprising contacting the effluent of a Fischer-Tropsch synthesis process with hydrogen in the presence of a suitable hydrogenation catalyst.
  • the effluent of the Fischer-Tropsch synthesis is described in this US patent specification as comprising pre-dominantly olefins and carboxylic acids.
  • useful fuel components comprising alkanes, alcohols and esters are produced.
  • European patent application No. 0 583 836 discloses a process for the preparation of hydrocarbon fuels from carbon monoxide and hydrogen.
  • Fischer-Tropsch synthesis is the use of the Fischer-Tropsch synthesis to prepare hydrocarbons suitable for use as lubricating base oil or lubricating base oil precursor, such as a Fischer-Tropsch wax.
  • European patent application No. 0 515 256 describes a process for the hydroisomerisation (hydroconversion) of Fischer-Tropsch waxes, using a catalyst containing zeolite Y. Upon solvent dewaxing of a fraction boiling above 380 °C a lubricating base oil is obtained having a VI of at least 130 and a pour point of at least -12 °C.
  • the hydroisomerisation treatment can be preceded by a hydrogenation treatment to remove any unsaturated hydrocarbons and oxygenates from the Fischer-Tropsch wax.
  • European patent application No. 0 321 303 discloses the preparation of middle distillate products from Fischer-Tropsch wax by a hydroisomerisation (hydroconversion) treatment. At least a portion of the bottoms fraction from the hydroisomerisation zone is either (a) further processed in a second hydroisomerisation zone or (b) fractionated and/or dewaxed for the production of a lubricating oil fraction boiling in the range of 343.3 °C to 510 °C. If desired, oxygenates may be removed from the Fischer-Tropsch wax by distillation.
  • the hydroisomerisation catalyst to be used in the first hydroisomerisation (hydroconversion) treatment is a platinum on fluorided alumina catalyst which is particularly effective (selective) at converting paraffinic Fischer-Tropsch wax to middle distillate material.
  • this catalyst is reported to be more effective than a catalyst containing a zeolite, in particular zeolite beta, as described in Example 3 of this patent application.
  • Example 3 describes in Example 3 that a zeolite Y catalyst can be as effective (selective) in the preparation of middle distillates from Fischer-Tropsch wax as a platinum on silica-alumina catalyst, but that a zeolite Y catalyst is much more active.
  • the zeolite Y catalyst required a reactor temperature of 260 °C, whilst the platinum on silica-alumina catalyst required a reactor temperature of 340 °C.
  • a hydroisomerisation (or hydroconversion) process involves both hydrocracking of paraffinic hydrocarbons and isomerisation of linear paraffinic hydrocarbons to branched paraffinic hydrocarbons. If it is desired to prepare lubricating base oils, it is advantageous to minimise the hydrocracking activity and to maximise the hydroisomerisation activity. Nevertheless, some hydrocracking activity is still required to crack the heaviest wax molecules to lower boiling products.
  • a disadvantage of a highly active catalyst, such as a zeolitic catalyst like zeolite Y, is that normally the hydrocracking activity is still too high and the hydroisomerisation activity too low.
  • molecular sieve catalysts such as silicoaluminophosphates and other zeolitic catalysts wherein the activity (expressed in terms of acidity) has been reduced to an alpha-value below 20 or even below 10 or 5.
  • these catalysts normally do not have sufficient hydrocracking activity.
  • European patent application No. 0 464 547 describes a process for the preparation of high viscosity index lubricants from slack wax by a two-step process wherein the first step the slack wax is hydrocracked under mild conditions using an amorphous catalyst, in particular a catalyst comprising Ni and W on a fluorided alumina carrier, and in the second step hydroisomerised using a low acidity zeolite beta catalyst, preferably having an alpha value of not greater than 5.
  • the alpha value is an approximate indication of the catalytic cracking activity of the catalyst compared to a standard catalyst.
  • the alpha test is described in United States patent specification No. 3 354 078 and in J. Catalysis, 4, 527 (1965); 6, 278 (1966); and 61, 395 (1980) and discussed in European patent application No. 0 464 547.
  • the alpha value is determined on the catalyst carrier not containing any catalytically active metals.
  • European patent application No. 0 323 092 discloses a process to prepare lubricating base oils starting from a Fischer Tropsch wax, by first hydrogenating the wax at a temperature of 343 to 412 °C and a pressure of between 70 and 100 bars in the presence of a catalyst having an alumina containing carrier. According to this publication a significant conversion of high boiling products occurs during hydrogenation. The hydrogenation step is followed by a hydrocracking/hydroisomerisation step and a pour point reducing treatment. A disadvantage of this process are the severe conditions employed in the hydrogenation step.
  • hydroconversion process refers to a process in which hydrocracking reactions and hydroisomerisation reactions occur and which is carried out in the presence of a catalyst comprising a refractory oxide carrier.
  • hydroisomerisation process refers to a process in which hydroisomerisation reactions and hydrocracking reactions occur, but which is carried out after a hydroconversion treatment and in which process generally less hydrocracking occurs than in the hydroconversion process.
  • a disadvantage of hydroconversion catalysts comprising a refractory oxide carrier is the high operating temperature which is required, in particular if the catalyst has been used for a prolonged time such as more than 2 years. In order to compensate for any catalyst deactivation generally the reaction temperature is increased. Above 350 °C and in particular above 400 °C at least part of the Fischer-Tropsch wax is converted into undesired aromatic compounds. Accordingly, it would be desirable to be able to provide a process which allows a hydroconversion process to be carried out at an operating temperature well below 400 °C and preferably below 350 °C, whilst using a catalyst containing a refractory oxide carrier and a catalytically active metal having hydrogenation/dehydrogenation activity.
  • the hydroconversion process can be operated at a reaction temperature below 400 °C, and even below 350 °C, even after the hydroconversion catalyst has been used for a prolonged time, that is for example more than 2 years.
  • the reaction temperature can be at least 5 °C, preferably at least 10 °C lower.
  • the hydroconversion catalyst deactivates much slower in a process which involves a preceding hydrogenation step.
  • the rate of reaction temperature increase required to compensate for any loss of catalyst activity can be much slower.
  • the present invention relates to a process for the preparation of lubricating base oils comprising subjecting a waxy raffinate to a pour point reducing treatment, and recovering a lubricating base oil therefrom, which waxy raffinate has been prepared by contacting a hydrocarbon product with hydrogen in the presence of a hydroconversion catalyst, comprising a catalytically active metal having hydrogenation/dehydrogenation activity supported on a refractory oxide carrier, under conditions such that hydrocracking and hydroisomerisation of the hydrocarbon product occur to yield the waxy raffinate, wherein the hydrocarbon product has been prepared by:
  • conditions such that substantially no hydrocracking or hydroisomerisation occurs in step (b) of the process of the present invention are defined as such conditions that the conversion in step (b) of the fraction of the feed boiling above 370 °C in % by weight, to a fraction boiling below 370 °C, is less than 10%.
  • hydroconversion step conditions such that hydrocracking and hydroisomerisation of the hydrocarbon product occur are defined as such conditions that the conversion as defined hereinabove is at least 15%.
  • substantially paraffinic when used in connection with hydrocarbon wax refers to a hydrocarbon mixture comprising at least 70 %wt (% by weight) paraffins, preferably at least 80 %wt paraffins.
  • Hydrocarbon wax produced by the process of this invention typically comprises at least 90 %wt paraffins, more typically at least 95 %wt paraffins.
  • a feed comprising a mixture of carbon monoxide and hydrogen is contacted at elevated temperature and pressure with a catalyst active in the synthesis of paraffinic hydrocarbons.
  • Suitable processes for the preparation of the mixture of carbon monoxide and hydrogen are well known in the art and include such processes as the partial oxidation of methane, typically in the form of natural gas, and the steam reforming of methane.
  • the relative amounts of carbon monoxide and hydrogen present in the feed may vary over a wide range and may be selected according to the precise catalyst and process operating conditions being employed.
  • the feed contacting the catalyst comprises carbon monoxide and hydrogen in a hydrogen/carbon monoxide molar ratio of below 2.5, preferably below 1.75. More preferably, the hydrogen/carbon monoxide ratio is in the range of from 0.4 to 1.5, especially from 0.9 to 1.3.
  • Unconverted carbon monoxide and/or hydrogen may be separated from the synthesis product and recycled to the inlet of the synthesis reactor.
  • the catalyst comprises, as the catalytically active component, a metal from Group VIII of the Periodic Table of the Elements.
  • a metal from Group VIII include ruthenium, iron, cobalt and nickel.
  • a catalyst comprising cobalt as the catalytically active metal is preferred.
  • the catalytically active metal is preferably supported on a porous carrier.
  • the porous carrier may be selected from any suitable refractory metal oxide or silicate or mixture thereof. Particular examples of preferred carriers include silica, alumina, titania, zirconia and mixtures thereof. Carriers comprising silica and/or alumina are especially preferred.
  • the catalytically active metal may be applied to the carrier by any of the techniques known in the art, for example comulling, impregnation or precipitation. Impregnation is a particularly preferred technique, in which the carrier is contacted with a compound of the catalytically active metal in the presence of a liquid, most conveniently in the form of a solution of the metal compound.
  • the compound of the active metal may be inorganic or organic, with inorganic compounds being preferred, in particular nitrates.
  • the liquid employed may also be either organic or inorganic. Water is a most convenient liquid.
  • the amount of catalytically active metal present on the carrier is typically in the range of from 1 to 100 parts by weight, preferably 10 to 50 parts by weight, per 100 parts by weight of carrier material.
  • the catalytically active metal may be present in the catalyst together with one or more metal promoters or co-catalysts.
  • the promoters may be present as metals or as the metal oxide, depending upon the particular promoter concerned. Suitable metal oxide promoters include oxides of metals from Groups IIA, IIIB, IVB, VB or VIB of the Periodic Table, oxides of the lanthanides and/or the actinides.
  • the catalyst comprises an oxide of an element in Group IVB of the Periodic Table, in particular titanium or zirconium. Catalysts comprising zirconium are especially preferred.
  • the catalyst may comprise a metal promoter selected from Groups VIIB and/or VIII of the Periodic Table.
  • Preferred metal promoters include platinum and palladium.
  • a most suitable catalyst comprises cobalt as the catalytically active metal and zirconium as a promoter.
  • the promoter may be incorporated in the catalyst using any of the methods discussed hereinbefore with respect to the catalytically active component.
  • the promoter if present in the catalyst, is typically present in an amount of from 1 to 60 parts by weight, preferably from 2 to 40 parts by weight, per 100 parts by weight of carrier material.
  • the hydrocarbon synthesis is conducted under conditions of elevated temperature and pressure. Typically, the synthesis is effected at a temperature in the range of from 125 to 300 °C, preferably from 175 to 250 °C.
  • the reaction pressure is typically in the range of from 5 to 100 bar, preferably from 12 to 50 bar.
  • the synthesis may be conducted using a variety of reactor types and reaction regimes, for example in a fixed bed regime, a slurry phase regime or an ebullating bed regime.
  • the hydrocarbon wax of the synthesis step (a) is subjected to a hydrogenation treatment in step (b) of the process of the present invention.
  • the entire effluent of the synthesis stage may be led directly to the hydrogenation step.
  • the low molecular weight products of the synthesis stage in particular the C 4 - fraction, for example methane, ethane and propane, may also be removed prior to the hydrogenation treatment.
  • the separation is conveniently effected using distillation techniques well known in the art.
  • the hydrocarbon wax can be separated into a low boiling fraction, boiling for example below 330 °C or below 370 °C and at least one high boiling fraction, boiling above 330 °C or above 370 °C and treat the high boiling fraction in the process of the present invention. Separation may be effected using vacuum distillation or alternatively short path distillation such as vacuum film distillation (using wiped film evaporators).
  • the hydrocarbon product is contacted with hydrogen in the presence of a hydrogenation catalyst.
  • a hydrogenation catalyst Suitable catalysts for use in this stage are known in the art.
  • the catalyst comprises as catalytically active component one or more metals selected from Groups VIB and VIII of the Periodic Table of Elements, in particular one or more metals selected from molybdenum, tungsten, cobalt, nickel, ruthenium, iridium, osmium, platinum and palladium.
  • the catalyst comprises on or more metals selected from nickel, platinum and palladium as the catalytically active component.
  • a particularly suitable catalyst comprises nickel as a catalytically active component.
  • Catalysts for use in the hydrogenation stage typically comprise a refractory metal oxide or silicate as a carrier.
  • Suitable carrier materials include silica, alumina, silica-alumina, zirconia, titania and mixtures thereof.
  • Preferred carrier materials for inclusion in the catalyst for use in the process of this invention are silica, alumina, silica-alumina, and diatomaceous earth (kieselguhr).
  • the catalyst may comprise the catalytically active component in an amount of from 0.05 to 80 parts by weight, preferably from 0.1 to 70 parts by weight, per 100 parts by weight of carrier material.
  • the amount of catalytically active metal present in the catalyst will vary according to the specific metal concerned.
  • One particularly suitable catalyst for use in the hydrogenation stage comprises nickel in an amount in the range of from 30 to 70 parts by weight per 100 parts by weight of carrier material.
  • a second particularly suitable catalyst comprises platinum in an amount in the range of from 0.05 to 2.0 parts by weight per 100 parts by weight of carrier material.
  • Suitable catalysts for use in the hydrogenation stage of the process of this invention are available commercially, or may be prepared by methods well known in the art, for example the methods discussed hereinbefore with reference to the preparation of the hydrocarbon synthesis catalyst.
  • the hydrocarbon wax is contacted with hydrogen at elevated temperature and pressure.
  • the operating temperature may typically range from 100 to 300 °C, more preferably from 150 to 275 °C, in particular from 175 to 250 °C.
  • the operating pressure ranges from 5 to 150 bars, preferably from 10 to 50 bars.
  • Hydrogen may be supplied to the hydrogenation stage at a gas hourly space velocity in the range of from 100 to 10000 Nl/l/hr, more preferably from 250 to 5000 Nl/l/hr.
  • the hydrocarbon wax being treated is typically supplied to the hydrogenation stage at a weight hourly space velocity in the range of from 0.1 to 5 kg/l/hr, more preferably from 0.25 to 2.5 kg/l/hr.
  • the ratio of hydrogen to hydrocarbon wax may range from 100 to 5000 Nl/kg and is preferably from 250 to 3000 Nl/kg.
  • the hydrogenation stage is operated under conditions such that substantially no isomerisation or hydrocracking of the feed occurs.
  • the precise operating conditions required to achieve the desired degree of hydrogenation without substantial hydrocracking or hydroisomerisation occurring will vary according to the composition of the hydrocarbon wax being fed to the hydrogenation stage and the particular catalyst being employed.
  • the degree of conversion of the feed hydrocarbon may be determined. In this respect, conversion, in percent, is defined as the percent weight of the fraction of the feed boiling above 370 °C which is converted during the hydrogenation to a fraction boiling below 370 °C.
  • the conversion of the hydrogenation stage is below 10%, preferably below 8%, more preferably below 5%.
  • the hydrocarbon product leaving the hydrogenation stage substantially consists of high molecular weight, paraffinic hydrocarbons having a boiling point range within and above that of lubricating base oils.
  • Lubricating base oils typically have a 5% by weight boiling point of at least 330 °C, preferably at least 370 °C.
  • the boiling point range of lubricating base oils may range up to 650 °C, preferably up to 600 °C. It will be appreciated that the above boiling points and boiling point ranges refer to boiling point (ranges) at atmospheric pressure. At least a part of this hydrocarbon product is subjected to the hydroconversion step of the process of this invention, to yield the waxy raffinate.
  • the entire effluent of the hydrogenation stage may be led directly to the hydroconversion stage.
  • the separation may be conveniently achieved using distillation techniques well known in the art. At least a part of the remaining C 5 + fraction of the hydrocarbon product is then used as feed for the hydroconversion stage.
  • waxy raffinate is prepared from the hydrocarbon product of the hydrogenation stage by hydrocracking and hydroisomerising the product with hydrogen in the presence of a suitable catalyst.
  • the catalyst comprises as catalytically active component one or more metals selected from Groups VIB and VIII of the Periodic Table of Elements, in particular one or more metals selected from molybdenum, tungsten, cobalt, nickel, ruthenium, iridium, osmium, platinum and palladium.
  • the catalyst comprises one or more metals selected from nickel, platinum and palladium as the catalytically active component. Catalysts comprising platinum as the catalytically active component have been found to be particularly suitable for use in the hydroconversion stage.
  • Catalysts for use in the hydroconversion stage typically comprise a refractory metal oxide as a carrier.
  • Suitable carrier materials include silica, alumina, silica-alumina, zirconia, titania and mixtures thereof.
  • Preferred carrier materials for inclusion in the catalyst for use in the process of this invention are silica, alumina and silica-alumina.
  • a particularly preferred catalyst comprises platinum supported on a silica-alumina carrier.
  • the acidity of the catalyst carrier may be enhanced by applying a halogen moiety, in particular fluorine, or a phosphorous moiety to the carrier. This may be especially preferred if the catalyst carrier itself is not acidic, for example if the catalyst carrier contains alumina or silica.
  • the catalyst may comprise the catalytically active component in an amount of from 0.05 to 80 parts by weight, preferably from 0.1 to 70 parts by weight, per 100 parts by weight of carrier material.
  • the amount of catalytically active metal present in the catalyst will vary according to the specific metal concerned.
  • a particularly preferred catalyst for use in the hydroconversion stage comprises platinum in an amount in the range of from 0.05 to 2 parts by weight, more preferably from 0.1 to 1 parts by weight, per 100 parts by weight of carrier material.
  • Suitable catalysts for use in the hydroconversion stage of the process of this invention are available commercially, or may be prepared by methods well known in the art, for example the methods discussed hereinbefore with reference to the preparation of the hydrocarbon synthesis catalyst.
  • the hydrocarbon product of the hydrogenation stage is contacted with hydrogen in the presence of the catalyst at elevated temperature and pressure.
  • the temperatures necessary to yield the waxy raffinate will lie in the range of from 175 to 380 °C, preferably from 250 to 350 °C, more preferably from 250 to 330 °C.
  • the pressure typically applied ranges from 10 to 250 bars, more preferably from 25 to 250 bars.
  • 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 from 0.25 to 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 degree of hydrocracking and isomerisation occurring in the hydroconversion stage may be measured by determining the degree of conversion of the fraction boiling above 370 °C, as hereinbefore defined.
  • the hydroconversion stage is operated at a conversion of at least 20%, preferably at least 25%, but preferably not more than 50%, more preferably not more than 45%.
  • the hydrogen required for the operation of both the hydrogenation and the hydroconversion stages may be generated by processes well known in the art, for example by the steam reforming of a refinery fuel gas.
  • the waxy raffinate is then subjected to a pour point reducing treatment to reduce the pour point to at least -12 °C, preferably at least -18 °C, more preferably at least -24 °C.
  • Pour point reducing treatments are well known to those skilled in the art and include solvent dewaxing, catalytic dewaxing, (hydro) isomerisation (dewaxing) and/or addition of pour point depressing agents.
  • solvent dewaxing catalytic dewaxing
  • hydro isomerisation
  • pour point depressing agents addition of pour point depressing agents.
  • the latter treatment is generally not preferred in the preparation of lubricating base oils as additives contained in a base oil may deteriorate rather quickly and blending of different base oils and additive packages to prepare a finished base oil may become a problem.
  • Catalytic dewaxing is well known to those skilled in the art. In a catalytic dewaxing process straight chain paraffins and slightly branched paraffins are cracked to products boiling below the lubricating base oil boiling point range. However, the catalysts which are employed are not fully selective to wax molecules only. In fact also branched paraffins having a very high VI and a sufficiently low pour point are cracked to lower boiling products. Thus, cracking of those compounds to products boiling below the lubricating base oil range results in lubricating base oils having a lower VI than lubricating base oils which have been prepared by a solvent dewaxing process. Further, as compared with solvent dewaxing, lubricating base oils are prepared in lower yield. Nevertheless, catalytic dewaxing is being applied commercially as generally the operation of the process is cheaper than operation of a solvent dewaxing process.
  • Catalysts which can be used in a catalytic dewaxing process include zeolites having a constraint index from 1 to 12, in particular of the MFI structure type, such as ZSM-5, -11, -22, -23, -35 as well as Ferrierite and composite crystalline silicates described in European patent application Nos. 0 100 115, 0 178 699 and 0 380 180.
  • Another suitable catalytic dewaxing catalyst comprises mordenite. If desired, waxy raffinate feed can be separated into various fractions and the various fraction can then be treated separately using different dewaxing catalysts, as disclosed in European patent application No. 0 237 655 and also European patent application No. 0 161 833.
  • the catalysts typically contain at least one catalytically active metal chosen from Groups VIb, VIIb and VIII of the Periodic Table of the Elements.
  • the catalytic dewaxing process is typically carried out at a temperature from 200 °C to 500 °C, a hydrogen pressure from 5 to 100 bar, a space velocity from 0.1 to 5 kg/l/h and a hydrogen/oil ratio from 100 to 2500 Nl/kg.
  • Solvent dewaxing is well known to those skilled in the art and involves admixture of one or more solvents and/or wax precipitating agents with waxy raffinate and cooling the mixture to a temperature in the range of from -10 °C to -40 °C, preferably in the range of from -20 °C to -35 °C, to separate the wax from the oil.
  • the oil containing the wax is usually filtered through a filter cloth which can be made of textile fibres, such as cotton; porous metal cloth; or cloth made of synthetic materials.
  • the solvents may be recovered from the wax and the lubricating base oil by filtration and recirculation of the solvents into the process. It will be appreciated that although solvents are recirculated the process is still rather expensive as a large amount of solvents is required and cooling of the waxy raffinate/solvent mixture requires much energy.
  • the wax that is separated in the solvent dewaxing process may be recycled to the hydroconversion stage, or alternatively, may be sent to a hydroisomerisation stage if for example, the pour point reducing treatment involves both a solvent dewaxing stage and a hydroisomerisation stage.
  • the wax may be subjected to a deoiling treatment prior to recycling. Another possibility is to fractionate the wax and sell one or more of the fractions on the wax market. Fractionation is typically effected using short path distillation.
  • a very suitable pour point reducing treatment comprises a hydroisomerisation treatment, in the art sometimes referred to as isomerisation dewaxing or iso-dewaxing.
  • the hydroisomerisation treatment typically comprises contacting the waxy raffinate with hydrogen in the presence of a hydroisomerisation catalyst.
  • the hydroisomerisation treatment is cheaper to operate and the hydroisomerisation treatment does substantially not suffer from the disadvantages of catalytic dewaxing, that is a lower VI and a lower yield as compared with solvent dewaxing.
  • a hydroisomerisation catalyst having a high activity for catalysing hydroisomerisation reactions, but a low activity for catalysing hydrocracking reactions. It has been found that in order to achieve this the acidity of the catalyst, as expressed by the alpha value, should be below 20.
  • the catalyst comprises a molecular sieve.
  • the hydroisomerisation catalyst comprises a molecular sieve having an alpha value below 20, more preferably below 10, even more preferably below 5.
  • the experimental conditions of the alpha test to be used to determine the alpha values referred to in this specification include a constant temperature of 538 °C and a variable flow rate as described in detail in J. Catalysis, 61, 395 (1980).
  • the molecular sieve operating in hydroisomerisation duty is a zeolite, preferably having a silica/alumina molar ratio of at least 10, more preferably at least 30.
  • a zeolite having a high silica/alumina ratio generally has a lower acidity than a zeolite having a low silica/alumina ratio.
  • a high silica/alumina ratio may be obtained by synthesis of the zeolite at a high silica/alumina ratio and/or by a dealumination treatment such as steaming. Both methods are well known to those skilled in the art.
  • framework aluminium may be replaced by another trivalent element such as boron which results in a lower level of acidity.
  • the molecular sieve is chosen from the group of ZSM-12, mordenite and zeolite beta, more preferably zeolite beta.
  • the low acidity forms of zeolite beta may be obtained by synthesis of a highly siliceous form of the zeolite, e.g. with a silica/alumina ratio above 50 or by steaming zeolites of lower silica-alumina ratio to the requisite acidity level.
  • Another method is by replacement of a portion of the framework aluminium of the zeolite with another trivalent element such as boron.
  • the zeolite contains framework boron, typically at least 0.1% by weight, preferably, at least 0.5% by weight.
  • the zeolite also may contain material in the pores of the structure which do not form part of the framework constituting the characteristic structure of the zeolite.
  • framework boron refers to boron that is actually present in the framework of the zeolite. As opposed to material present in the pores of the zeolite, framework boron contributes to the ion exchange capacity of the zeolite.
  • zeolite beta to be used in the process of the present invention contains at least 0.1% by weight.
  • the boron content will usually be not more than 5% by weight, preferably not more than 2% by weight.
  • the silica/alumina ratio of the as-synthesized zeolite is typically below 30.
  • the boron containing zeolite is steamed to reduce the alpha value to not more than 10, preferably not more than 5. Typical steaming conditions are known and have been described in European patent application No. 0 464 547.
  • the zeolite will usually be composited with a matrix material (binder) to form the finished catalyst.
  • a matrix material binder
  • Non-acidic refractory oxide binder materials like silica, titania or alumina are preferred. Silica is especially preferred.
  • the zeolite is usually composited with the matrix in amounts from 20 to 80% by weight, preferably from 50 to 80% by weight. Methods for extruding zeolite with the binder are known to those skilled in the art.
  • the molecular sieve is an aluminophosphate.
  • Aluminophosphates are well known in the art and have been described in, for example, United States patent Nos. 4 310 440, 4 440 871, 4 567 029, and 4 793 984.
  • Aluminophosphates have the advantage of an intrinsically lower acidity as compared with zeolites.
  • aluminophosphates are to be understood as reference to the class of aluminophosphates, that is including metallo-aluminophosphates, silico-aluminophosphates, metallo-silico-aluminophosphates as well as non-metal substituted aluminophosphates and silico-aluminophosphates.
  • the molecular sieve has at least some intrinsic acidity and therefore the aluminophosphate is chosen from the group of metallo-aluminophosphates, wherein the further metal present in the framework of the aluminophosphate is not a trivalent metal, silico-aluminophosphates or metallo-silico-aluminophosphates.
  • the aluminophosphate is a silico-aluminophosphate.
  • the process is preferably carried out with a hydroisomerisation catalyst comprising an aluminophosphate, in particular a silico-aluminophosphate, chosen from the group of structure types 11, 31 and 41, more preferably structure type 11. Silico-aluminophosphates of structure types 11, 31 and 41 have been described in international patent application No. WO 90/09362.
  • the hydroisomerisation catalyst comprises a silico-aluminophosphate of structure type 11, and having a special silica/alumina distribution over the crystalline particle.
  • the silico-aluminophosphate molecular sieve is characterised by an X-ray diffraction pattern according to Table I.
  • X-ray powder diffraction patterns can be determined by standard techniques, using K-alpha/doublet copper radiation.
  • the silico-aluminophosphate is further characterised by a P 2 O 5 to alumina molar ratio at the surface of 0.80 or less and a P 2 O 5 to alumina ratio of the bulk of the silico-aluminophosphate is 0.96 or greater, and the silica to alumina mole ratio at the surface is greater than in the bulk of the silico-aluminophosphate.
  • This silico-aluminophosphate is known in the art as SM-3. Preparation of SM-3 has been disclosed in international patent application No. WO 91/13132.
  • the isomerisation catalyst comprises an inorganic, non-layered, porous, crystalline phase material as described in international patent application No. WO 93/02161.
  • the hydroisomerisation catalyst typically comprises a catalytically active metal having hydrogenation/dehydrogenation activity, such as those of Groups VIb and VIII.
  • the hydroisomerisation catalyst comprises a Group VIII metal, in particular a Group VIII noble metal such as platinum and/or palladium.
  • Means for incorporating the metal into the catalyst carrier, comprising a molecular sieve as described hereinbefore, are well known to those skilled in the art and have been described hereinbefore.
  • the amount of noble metal is typically in the range of from 0.5 to 5% by weight of the total catalyst, preferably in the range of from 0.5 to 2% by weight.
  • the waxy raffinate is contacted with hydrogen in the presence of a catalyst as described hereinabove at elevated temperature and pressure.
  • the temperatures necessary to yield the lubricating base oil will lie in the range of from 175 to 380 °C, preferably from 200 to 350 °C.
  • the pressure typically applied ranges from 10 to 250 bars, more preferably from 25 to 250 bars.
  • the waxy raffinate may be provided at a weight hourly space velocity of from 0.1 to 20 kg/l/hr, preferably from 0.1 to 5 kg/l/hr.
  • the finished lubricating base oil preferably has a pour point of less than -15 °C, more preferably less than -20 °C and a VI of more than 135, preferably more than 140.

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Claims (29)

  1. Verfahren zur Herstellung von Schmiermittelgrundölen, umfassend die Ausführung einer Pourpoint-Erniedrigungsbehandlung an einem Wachsraffinat und ein Gewinnen eines Schmiermittelgrundöles daraus, welches Wachsraffinat durch Inkontaktbringen eines Kohlenwasserstoffproduktes mit Wasserstoff in Gegenwart eines Hydrokonversionskatalysators, der ein katalytisch aktives Metall mit Hydrier/Dehydrieraktivität, aufgebracht auf einen feuerfesten Oxidträger, umfaßt, unter solchen Bedingungen hergestellt worden ist, daß das Hydrocracken und die Hydroisomerisation des Kohlenwasserstoffproduktes unter Ausbildung des Wachsraffinats ablaufen, wobei das Kohlenwasserstoffprodukt hergestellt worden ist durch:
    (a) Inkontaktbringen eines Gemisches aus Kohlenmonoxid und Wasserstoff mit einem Kohlenwasserstoffsynthesekatalysator bei erhöhter Temperatur und erhöhtem Druck zur Ausbildung eines im wesentlichen paraffinischen Kohlenwasserstoffwachses; und
    (b) Inkontaktbringen des so erhaltenen Kohlenwasserstoffwachses mit Wasserstoff in Gegenwart eines Hydrierkatalysators bei einer Temperatur zwischen 100 und 300°C und unter solchen Bedingungen, daß der Gewichtsprozentanteil des über 370°C siedenden Einsatzmaterials, das zu einer unter 370°C siedenden Fraktion umgewandelt wird, unter 10 % liegt, um das Kohlenwasserstoffprodukt zu ergeben.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das Gemisch aus Kohlenmonoxid und Wasserstoff, das mit dem Katalysator in Stufe (a) in Kontakt gebracht wird, ein Wasserstoff/Kohlenmonoxid-Verhältnis von weniger als 2,5, vorzugsweise weniger als 1,75, stärker bevorzugt von 0,4 bis 1,5, aufweist.
  3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Kohlenwasserstoffsynthesekatalysator in Stufe (a) Ruthenium, Eisen, Nickel oder Kobalt, vorzugsweise Kobalt, als katalytisch aktives Metall umfaßt.
  4. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß der Kohlenwasserstoffsynthesekatalysator in Stufe (a) einen Träger, vorzugsweise ausgewählt unter Siliciumoxid, Aluminiumoxid, Titanoxid, Zirkoniumoxid und Gemischen hievon, am stärksten bevorzugt Siliciumoxid oder Aluminiumoxid, umfaßt.
  5. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß der Kohlenwasserstoffsynthesekatalysator in Stufe (a) als Promotor ein Oxid eines Metalls, ausgewählt aus der Gruppe IVB des Periodensystems der Elemente, vorzugsweise Titan oder Zirkonium, umfaßt.
  6. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß das Gemisch aus Kohlenmonoxid und Wasserstoff mit dem Katalysator in Stufe (a) bei einer Temperatur von 175 bis 250°C in Kontakt gebracht wird.
  7. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß das Gemisch aus Kohlenmonoxid und Wasserstoff mit dem Katalysator in Stufe (a) bei einem Druck von 12 bis 50 bar in Kontakt gebracht wird.
  8. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß der Hydrierkatalysator der Stufe (b) Molybdän, Wolfram, Kobalt, Nickel, Ruthenium, Iridium, Osmium, Platin oder Palladium als katalytisch aktives Metall umfaßt, vorzugsweise eines oder mehrere von Nickel, Platin und Palladium.
  9. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß der Hydrierkatalysator der Stufe (b) einen Träger umfaßt, vorzugsweise ausgewählt unter Siliciumoxid, Aluminiumoxid, Siliciumoxid-Aluminiumoxid, Titanoxid, Zirkoniumoxid und Gemischen hievon, vorzugsweise Siliciumoxid, Aluminiumoxid oder Siliciumoxid-Aluminiumoxid.
  10. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß in Stufe (b) das Kohlenwasserstoffprodukt mit dem Hydrierkatalysator bei einer Temperatur von 150 bis 275°C in Kontakt gebracht wird.
  11. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß in Stufe (b) das Kohlenwasserstoffprodukt mit dem Hydrierkatalysator bei einem Druck von 10 bis 50 bar in Kontakt gebracht wird.
  12. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß in Stufe (b) Wasserstoff mit einer Gasraumgeschwindigkeit von 100 bis 1000 Nl/h, vorzugsweise von 250 bis 5000 Nl/h, zugeführt wird.
  13. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß in Stufe (b) der Gewichtsprozentanteil des über 370°C siedenden Einsatzmaterials, das zu einer unter 370°C siedenden Fraktion umgewandelt wird, unter 5 % liegt.
  14. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß der Hydrokonversionskatalysator Molybdän, Wolfram, Kobalt, Nickel, Ruthenium, Iridium, Osmium, Platin oder Palladium als katalytisch aktives Metall umfaßt, vorzugsweise eines oder mehrere von Nickel, Platin und Palladium.
  15. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß der Hydrokonversionskatalysator einen Träger, vorzugsweise ausgewählt unter Siliciumoxid, Aluminiumoxid, Siliciumoxid-Aluminiumoxid, Titanoxid, Zirkoniumoxid und Gemischen hievon, vorzugsweise Siliciumoxid, Aluminiumoxid oder Siliciumoxid-Aluminiumoxid, umfaßt.
  16. Verfahren nach Anspruch 15, dadurch gekennzeichnet, daß der Hydrokonversionskatalysator einen halogenhältigen Träger umfaßt.
  17. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß das Kohlenwasserstoffprodukt mit dem Hydrokonversionskatalysator bei einer Temperatur von 175 bis 380°C, vorzugsweise 250 bis 350°C, in Kontakt gebracht wird.
  18. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß das Kohlenwasserstoffprodukt mit dem Hydrokonversionskatalysator bei einem Druck von 10 bis 250 bar, vorzugsweise von 25 bis 250 bar, in Kontakt gebracht wird.
  19. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß in der Hydrokonversionsstufe Wasserstoff mit einer stündlichen Gasraumgeschwindigkeit von 100 bis 10.000 Nl/l/h, vorzugsweise 500 bis 5.000 Nl/l/h, zugeführt wird.
  20. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß in der Hydrokonversionsstufe der Gewichtsprozentanteil des über 370°C siedenden Einsatzmaterials, das zu einer unter 370°C siedenden Fraktion umgewandelt wird, wenigstens 20 % liegt.
  21. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß die Pourpoint-Erniedrigungsbehandlung das Inkontaktbringen des Wachsraffinats mit Wasserstoff in Gegenwart eines Hydroisomerisationskatalysators umfaßt.
  22. Verfahren nach Anspruch 21, dadurch gekennzeichnet, daß der Hydroisomerisationskatalysator ein Molekularsieb umfaßt und der Katalysator einen α-Wert unter 20, stärker bevorzugt unter 10, aufweist.
  23. Verfahren nach Anspruch 22, dadurch gekennzeichnet, daß das Molekularsieb ein Zeolith, vorzugsweise mit einem Siliciumoxid/Aluminiumoxid-Molverhältnis von wenigstens 10, ist.
  24. Verfahren nach Anspruch 22 oder 23, dadurch gekennzeichnet, daß das Molekularsieb aus der Gruppe von ZSM-12, Mordenit und Zeolith-β, vorzugsweise Zeolith-β, ausgewählt ist.
  25. Verfahren nach Anspruch 22, dadurch gekennzeichnet, daß das Molekularsieb ein Aluminophosphat ist.
  26. Verfahren nach Anspruch 25, dadurch gekennzeichnet, daß das Aluminophosphat ein Silicoaluminiumphosphat ist.
  27. Verfahren nach Anspruch 25 oder 26, dadurch gekennzeichnet, daß das Aluminophosphat aus der Gruppe der Strukturtypen 11, 31 und 41, vorzugsweise Strukturtyp 11, ausgewählt ist.
  28. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß der Hydrokonversionskatalysator ein katalytisch aktives Metall, ausgewählt aus den Gruppen VIB und/oder VII des Periodensystems der Elemente, vorzugsweise ein oder mehrere Gruppe VIII-Edelmetalle, umfaßt.
  29. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß die Pourpoint-Erniedrigungsbehandlung eine Lösungsmittelentwachsungsbehandlung oder eine katalytische Entwachsungsbehandlung umfaßt.
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