• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Process for the manufacture of lubricating base oils from nitrogen-containing distillates and/or deasphalted oils by subjecting them to a catalytic hydrotreatment which may be followed by a dewaxing treatment, wherein distillates and/or deasphalted oils having a nitrogen content which numerically expressed exceeds the value f.PH2.Sv -1, wherein f is a constant relating to the viscosity of the final base oil, PH2 represents the hydrogen partial pressure in bar applied in the catalytic hydrotreatment and Sv represents the weighted hourly space velocity in t/m3.h at which the catalytic hydrotreatment is carried out, are subjected to a preceding solvent extraction.
    公开号:SU1507213A3
    申请号:SU853961257
    申请日:1985-10-10
    公开日:1989-09-07
    发明作者:Джордж Бэйли Герхард；Майкл Джозеф Бийваард Хенрикус；Мария Петрус Янссен Мартинус
    申请人:Шелл Интернэшнл Рисерч Маатсхаппий Б.В. (Фирма)；
    IPC主号:
    专利说明:

    The invention relates to a process for the preparation of lubricating base oils and can be used in the petrochemical industry.
    The aim of the invention is to improve the quality of the target product.
    The method is carried out as follows.
    The stage of selective extraction of the feedstock with furfural is carried out at 81-1 ° C, and the mass ratio of furfural: starting material is 0.8-2.4.
    The feedstock containing nitrogen in an amount exceeding the value calculated by the formula f-Ph, - 2 (mg / kg) where f is the viscosity coefficient of the target
    cm
    th base oil, defined by the expression 2, 1, 1 2,, where), oo kinematic viscosity at, cSt (in the case of obtaining the target residual lubricant base oil of 4.5); P, is the hydrogen partial pressure of the Hydrotreating process, bar} S is the feed rate, t / h per 1 m of the Hydrotreating catalyst, is extracted to a nitrogen content of the obtained raffin of 0.3-0.96, calculated from specified formula.
    Conducting excessively deep or insufficient extraction leads to a decrease in the yield and quality of the jelly product.
    In selective extraction of the residual oil fraction, asphalt bitumen is previously removed from the latter. The asphalting is carried out at elevated temperature and pressure in the presence of an excess amount, for example, propane, butane, pentane, or mixtures thereof. The deasphalting process is carried out at a pressure of 20-100 bar 50-150 ° C and a solvent / oil mass ratio of 7: 1-1: 1.
    The hydrotreating step is carried out at 290-425 0, preferably at 310-400 ° C and most preferably at 325-380 ° C. The pressure is 80-200 bar. Preferably, a hydrogen pressure of 90-160 bar is used. The hydrotreating process is carried out at values of the bulk feed rate of 0.5-1.5. Preferably, the process is carried out at space velocity values in the range of 0.5-1.2 t / m3 .4.
    In this process, you can use both pure hydrogen and any gas mixed with hydrogen, the content of which reaches 60% by volume or more. In practice, it is advisable to use a hydrogen-containing gas leaving the catalytic reforming unit. Such a gas not only contains hydrogen in sufficient quantity but also low-boiling hydrocarbons, for example methane and small amounts of propane. The applicable hydrogen / feedstock ratio is 300-500 standard liters (liters at a pressure of 1 bar and 0 C) per kg kg. It is preferable to use a ratio of 500-2500 standard liters per
    Q
    0 5
    0 5 0
    j
    0
    five
    34
    1 kg of raw materials, in particular from 500-2000 standard liters of ita 1 kg of raw materials.
    The catalysts used in the hydrotreatment stage include one or more metals selected from groups VI B and VIll, the Periodic Table of the Elements, or sulphides or their oxides, which can be supported on a carrier containing one or more oxides of the elements selected from the groups II, III and IV of the Periodic Table of the Elements. The catalysts may also contain one or more promoters. Preference is given to catalysts consisting of one or more metals, for example molybdenum, chromium, tungsten, platinum, nickel, iron and cobalt, or their oxides and / or sulfides, both on the support and on and without it. In particular, catalysts consisting of combinations of one-IO or several metals selected from group VIII (for example, iron, cobalt, nickel) and one or several metals of group IV (chromium, molybdenum and tungsten), for example cobalt and molybdenum, nickel and tungsten, nickel and molybdenum, deposited on alumina.
    It is advisable to use catalysts in sulfide form. Sulfidation may be carried out, for example, by contacting the catalysts with a sulfur-containing gas, for example, with a mixture of hydrogen and hydrogen sulphide, with a mixture of hydrogen and carbon disulfide, or with a mixture of hydrogen and mercaptan, for example butyl mercaptan. Sulfidation can also be carried out by reacting the catalyst with hydrogen and a sulfur-containing hydrocarbon oil fraction, for example sulfur-containing kerosene or gas oil.
    In addition, the catalysts may contain one or more promoters. Promoters used include compounds containing phosphorus, fluorine or bromine.
    Silicon dioxide, alumina, zirconium, thorium, and boron are used as catalyst carriers, as well as their mixtures, for example, aluminosilicate, magnesium silicate, and zirconium silicate. It is advisable to use catalysts that carry alumina as a carrier.
    51
    Metals HJTH metal compounds are introduced into catalysts by any of the known techniques used to prepare supported catalysts. It is preferable to introduce them by impregnation of the catalyst in one or several stages with an aqueous solution containing one or several metal compounds, followed by drying and calcination. If the impregnation is carried out in several stages, the material may be impregnated and calcined between successive impregnation stages.
    The metal content of the catalyst can vary over a wide range. Preferably, the catalysts contain at least 10 ma.h of the metal of group VI B and / or at least 3 ma.h. Group VIII metal at 100 mph. carrier. The catalyst may also contain up to 100 May, h, of a metal of group VI B and / or a metal of group VIII per 100 parts by weight. carrier.
    On en respectful rolled. The catalysts are fluorine-containing catalysts; none of the catalysts include nickel and / or cobalt and, in addition, molybdenum, nickel and tungsten supported on alumina as a carrier, the bulk weight of the state-controlled catalysts is not less than 0.8 g / m. Moreover, these catalysts contain at least 3 ma.ch. nickel and / go cobalt, 10 mach. molybdenum and 20 ma.ch. tungsten, respectively, on 100 ma.ch. carrier. These catalysts are obtained from an alumina hydrogel, during the drying and calcination of which xerogel can be obtained, the bulk weight in the compacted state of which is not less than 0.8 g / ml. Catalysts for
    shine as follows
    If the xerogel porosity ratio is not less than 0.5, the catalyst is obtained either by drying and calcining the alumina hydrogel, then introducing nickel and tungsten into the xerogel and re-drying and calcining the resulting compositions, or by introducing the metals into the alumina hydrogel, drying and calcining the resulting composition.
    In the event that the coefficient of porosity of the indicated xerogel is
    five
    72
    Q J5
    20 25
    Jq.
    l
    35
    45
    55
    136
    A catalyst of less than 0.5 is obtained either by introducing at least one part of fluorine into an aluminum oxide hydrogel, drying and calcining the resulting composition, and introducing nickel and nolfram into the xerogel and re-drying and calcining the composition, or by introducing metals and at least one part of fluorine. in an alumina hydrogel, by drying and calcining the resulting composition. An additional condition is if the alumina hydrogel with the coefficient porosity less than 0.5 ohm necessary to introduce sufficient quantitative zo fluorine into the alumina hydrogel to obtain a fluorine-containing alumina hydrogel, yielding when drying and calcining xenon P01 spruce porosity coefficient not less than 0.5.
    If a catalyst containing nickel and tungsten, which is obtained by diffusion and xerogel (i, e, with the introduction of metals into the xerogel) is used in the hydrotreating step, preference is given to a catalyst containing 3 to 12 wt.h. Nickel and 20-75 May, h, alumina, and in particular such a catalyst, in which the mass ratio of nickel / tungsten ranges between 1: 1.5 and 1: 5,
    g
    .If at this stage use
    the catalyst, the contents of nickel and tungsten, which is obtained by diffusion of a hydrogel (t, e, by the incorporation of metals into the hydrogel), preference is given to a catalyst containing 20–50 May, h, nickel, and 50–80 wt.h. tungsten per 100 weight, h, alumina and, in particular, the catalyst, the mass ratio of nickel / tungsten which varies in the range of 1: 1.5 and 1: 5,
    When using a catalyst containing nickel and / or cobalt and optionally molybdenum, preference is given to a catalyst comprising 25-80 May, h, nickel and / or cobalt and 50-80 us, h, molybdenum per 100 mah.h. alumina, in particular a catalyst, in which the mass ratio of nickel / and - or cobalt on the one hand and molybdenum
    7150
    on the other hand, it ranges between 1: 1 and 1: 5.
    The fluorine content in said catalysts is preferably 0.5-10 mash., Per 100 mash. alumina upon receipt of the catalyst by diffusion of xerogel and 10-25 wt.h. - 100 ma.ch. alumina in its manufacture by diffusion hydrogel.
    Some or all of the components of the fluoride compound may be introduced into the catalyst prior to local fluorination, carried out with the introduction of suitable fluorine coupling coefficients, for example, o-fluorotoluene or difluoroethane, into the gas stream and / nl liquid passing through the catalyst.
    Some or all of the hydrotreated products may be dewaxed to further improve the quality of the target base oil for lubricants. It is possible to use selective and catalytic dewaxing. High boiling hydrotreated products must be subjected to catalytic dewaxing or catalytic dewaxing with preliminary dewaxing with a selective solvent. I
    Selective dewaxing of the product when using paired plant growers, one of which dissolves and maintains the fluidity of the products at low temperatures (for example methyl isobutyl ketone, in particular toluene) and the other, which dissolves a small amount of paraffin at low temperatures and acts as paraffin precipitator (for example, methyl ethyl ketone). In addition, propane and chlorinated hydrocarbons, such as dichloromethane, can be used for this. Typically, the product to be dewaxed is mixed with solvents and heated to form a solution. Then the resulting mixture is cooled to a filtration temperature, usually in the range from -10 to.
    After that, the cooled mixture is filtered, and the separated paraffin is washed with a cooled solvent. At the final stage, the solvents are reduced from to a waxy oil distillate and separated paraffin during filtration and recycled to the process.
    d
    five
    about 5
    0
    with y
    0
    five
    38
    Catalytic dewaxing is carried out by contacting the hydrotreated product in the presence of hydrogen with an appropriate catalyst. The catalysts used are crystalline aluminum silicates, for example ZSM-5, related compounds, for example ZSM-8, ZSM-n, ZSM-23 and ZSM-35, ferroferrite type compounds. In addition, composite crystal structures are used.
    The process of catalytic dewaxing is carried out at 250-500 0, hydrogen pressure 5-100 bar, space velocity 0.1-5.0 kg / G hydrogen / feed ratio, 100-2500 standard liters per 1 kg of raw material. Catalytic dewaxing is preferably carried out at 275-450 C, hydrogen pressure 10-75 bar, a space velocity of 0.2-3 kg 1 and a hydrogen / feedstock ratio of 200-2000 standard liters per 1 kg of raw material.
    However, in the case of solvent dewaxing, as a result of which a gas is formed at the same time, it is desirable to subject part of the obtained gas to Purification with hydrogen, i.e. Hydrotreating for isomerization or hydrocracking under mild conditions of said paraffin fractions into an isoparaffinous base oil having an ultra-high viscosity index exceeding 140.
    In addition, it is possible to conduct purification using hydrogenation under mild conditions or extraction / mild under mild conditions to improve certain properties of the product, for example, resistance to oxidation.
    Example 1 To obtain a neutral enamel base oil — 500 (neutralization number 500) with a kinematic viscosity of 10.9 cSt, with a neutral spray of 500 fraction obtained from Arabian heavy oil with a total nitrogen content of 950 mg / kg , is subjected to selective extraction with furfural before carrying out a catalytic hydrotreating process. The extraction was carried out at 85 ° C and a solvent / feed ratio of 0.8.
    In the obtained paraffin refining, the total content of organic nitrogen is 410 mg / kg. Rafi
    91
    The nat is then subjected to a catalytic hydrotreatment using a fluorinated alum-nickel-tungsten catalyst containing 5 wt.% nickel, 23 may L tungsten and 3 wt.% fluorine. The catalytic hydrotreating is carried out at a partial pressure of hydrogen at the reactor inlet of 140 bar, a space velocity of 0.74 t / m-h and a process temperature of 366 ° C.
    After the solvent dewaxing of the resulting catalytic hydrotreatment of the liquid product subjected to distillation, a neutral lubricating base oil-500 is obtained. The yield of the latter is 53% by weight of the starting material. The target product has a lower pour point and a viscosity index of 95, resistant to oxidation, the induction period is 127 minutes.
    The required minimum depth of extraction corresponds to a paraffin raffinate with a nitrogen content of 634 mg / kg. Thus, the feedstock is proestracted solution. up to 0.63 of the maximum permissible nitrogen content.
    A neutral lubricating base oil of 500 with a kinematic viscosity of 11.2 cSt is obtained from a neutral distillate fraction of 500 obtained from Arabian heavy oil, the total nitrogen content of which is 940 mg / kg when performing only selective extraction. Furfural extraction is carried out at 110 ° C and the furfural ratio / feedstock is 2.7. The base oil thus obtained has a comparable viscosity index and shows similar results in standard oxidability tests. In this case, nitrogen was removed in an amount of 91% by weight of the total content of organic nitrogen and the yield of the target product was 41% by weight.
    Example 2: To obtain a neutral base oil-250 with kinematic viscosity. 7.7 cSt at neutral distyLp t-250, obtained from Arabian heavy oil with a total nitrogen content of 760 mg / kg, is subjected to furfural extraction prior to catalytic hydrotreating. Extrac
    Q
    J5 20
    25 jq
    .Q, "
    35
    five
    1310
    The reaction was carried out at 81 s and the solvent / feed ratio was 1.4.
    The total content of organic nitrogen in the resulting paraffin wax is 180 mg / kg. After that, the paraffin raffinate is subjected to catalytic hydrotreating using the catalyst described in Example 1. The catalytic hydrotreating is carried out at a partial pressure of hydrogen at the inlet of the reactor 140 bar, a space velocity of 0.73 t / m h and.
    After solvent dewaxing of a liquid product of secondary distillation, obtained by catalytic hydrotreating, a neutral base oil-250 is obtained with a yield of 59.8 wt.% To the feedstock of selective extraction. The specified neutral base oil-250 has a pour point below -9 ° C and a viscosity index of 9.7. The resulting base oil meets the requirements for oxidation tests, the induction period is 160 minutes. The required minimum depth of extraction corresponds to paraffin raffinate with a total nitrogen content of 589 mg / kg. Thus, the neutral distillate 250 is selectively extracted to 0.30 of the maximum allowable nitrogen content.
    A neutral base oil of 250 cc and a viscosity index of 7.3 cSt is obtained from neutral distillate, m-250 obtained from Arabian heavy oil with a total nitrogen content of 610 mg / kg, and only selective extraction. Furfural extraction is performed at a solvent / feed ratio of 2.6. The base oil thus obtained has a comparable viscosity index and shows similar results in standard oxidability tests. In this case, the extraction process removed 92 wt.% Of nitrogen from its total content; the yield of the target product was 44.5 wt.%.
    Example 3. To obtain a lubricant residual base oil (BrightStock) with a kinematic viscosity of 29.5 mSt at 100 ° C, a deas- faltered oil fraction obtained from crude oil, with a total nitrogen content of 1880 mg / kg
    15
    subjected to extraction with furfural before catalytic hydrotreating. The extraction was carried out at 110 ° C and a solvent / feed ratio of 2.4.
    The resulting paraffin intermediate raffinate has a total nitrogen content of 820 mg / kg. Then, the intermediate raffinate is subjected to catalytic hydrotreating in the presence of the catalyst described in Example 1. The catalytic hydrotreating is carried out at a partial inlet pressure of 150 bar, with a volumetric rate of 0.6 t / m. h and 374 C.
    After solvent dewaxing of a liquid product of secondary distillation obtained by catalytic hydrotreating, a Bright stock is obtained with a yield of 51% by weight. The Brightstock has a pour point of below -9 ° C and a viscosity index of 96. The resulting base oil meets the requirements of standard oxidation tests. The induction period is 158 minutes. The minimum extraction depth in accordance with the above expression, where the value is 4.5, corresponds to a paraffin refinery, the total nitrogen content of which is 1050 mg / kg. By this is meant that de-asphalted oil is applied to fraction 1 and extracted with a solvent up to O, 78 of the maximum permissible nitrogen content.
    A BrightStock with a kinematic viscosity of 35 cSt at 100 ° C is obtained from a deasphalted oil fraction obtained from crude oil, the total nitrogen content of which is 1700 mg / kg when performing only selective extraction. Extraction using furfural is carried out at 140 ° C and the solution ratio
    solvent / feedstock 2.9. The resulting bright stock has a comparable viscosity index and shows similar results in standard oxidability tests. In this case, 82% by weight of nitrogen is removed from its total content. The yield of the target product is 41 May,%, Example 4. To obtain a neutral base oil-500 with a kinematic viscosity of 11.25 cSt at neutral distillate-500, obtained from Iranian heavy crude oil with an obtstsim content
    five
    0 5 o
    ,
    five
    0
    five
    1312
    in it, nitrogen equal to 2430 mg / kg is subjected to furfural extraction prior to a catalytic hydrotreatment process. The extraction was carried out at 90 ° C and a solvent / feedstock ratio of 0.9.
    The resulting paraffin intermediate raffinate contains 543 mg / kg nitrogen. Then, the intermediate paraffin raffinate is subjected to catalytic hydrotreating using the catalyst used in Example 1. The catalytic hydrotreating is carried out at a partial pressure of hydrogen at the inlet of the reactor 140 bar, a space velocity of 0.8 t / min. h and 375 ° C.
    After selective dewaxing of the liquid product of the secondary distillation, obtained by catalytic hydrotreating, a neutral base oil of 500 is obtained with a yield of 46 wt.%. Neutral base oil-500 has a pour point below -9 ° C and a viscosity index of 96. The base oil indicated meets the requirements for standard oxidability tests. The induction period is 137 minutes. The required minimum depth of extraction corresponds to a paraffin refinery with a total nitrogen content of about 612 mg / kg. Thus, the neutral distillate t-500 was selectively extracted to 0.89 from the maximum allowable soda ash load.
    When performing conventional selective extraction of a similar kind of distillate to obtain a similar high-quality product, there is a significant loss in the output of the base oil. Thus, the yield of the target product is 20% by weight. It is necessary to use a solvent / feedstock ratio that is higher in order to meet the required quality of intermediate base oil-500.
    Example 6. In order to obtain a base oil with a kinematic viscosity of 9.7 cSt at 100 ° C, the distillate fraction of Iranian heavy oil (475-520 ° C) with a nitrogen content of 2433 mg / kg was subjected to extraction by furfural before catalytic hydrotreating. The extraction was carried out at 100 ° C and a solvent / feedstock ratio of 1.8.
    The intermediate product has a nitrogen content of 373 mg / kg. It is hydrotreated using the catalyst of example 1, with a partial pressure of hydrogen of 140 bar, a space velocity of 0.8 t / m h and.
    After selective dewaxing, a boiling boiling point product (430 ° C) is isolated as a lubricant base oil. This base oil has a viscosity index of 103,
    The minimum extraction depth corresponds to an intermediate product with a nitrogen content of 580 mg / kg. Thus, the raw material is extracted with furfural up to 0.64 of the maximum permissible nitrogen content.
    To demonstrate the base oil production process, in which the stage of selective extraction is carried out under non-optimal conditions, the same raw material is subjected to furfural treatment at 80 ° C and with a solvent / raw material ratio of 1.9, resulting in an intermediate raffinate with a nitrogen content of 732 mg / kg After hydrotreating such a product at 370 ° C, at a hydrogen pressure of 140 bar and a space velocity of 0.8 t / mh using the same catalyst, and after dewaxing the hydrotreating product, a lubricant base oil is obtained with a viscosity coefficient of only 82.
    Example 7. To obtain a base oil with a kinematic viscosity of 6.7 cSt at 100 ° C, a fraction of the distillate of Iranian heavy oil (430-475 ° C) with a nitrogen content of 1829 mg / kg is subjected to an extraction treatment with furfurol before catalytic hydrotreating The extraction was carried out at 75 ° C and a solvent / 1.58 ratio.
    The intermediate product has a nitrogen content of 447 mg / kg. It is hydrotreated using the catalyst of example 1, with a partial pressure of hydrogen of 140 ba and a bulk velocity of 0.8 and.
    After ceJ effective dewaxing, the fractions release a lubricating base oil. The resulting base oil has a viscosity index of 96.
    The required minimum depth of extraction corresponds to an intermediate product with a nitrogen content
    Q
    j
    0 5 0
    Q
    -
    five
    517 mg / kg. This means that the cell has been extracted with furfural up to 0.86 of the maximum permissible nitrogen content.
    In order to demonstrate the process of obtaining a lubricating base oil under non-optimal conditions of the extraction stage, the same process is treated with furfural at a solvent / raw material ratio of 0.87, resulting in an intermediate product with a nitrogen content of 522 mg / kg. After hydrotreating the product ethorr at a hydrogen pressure of 140 bar and a space velocity of 0.8 t / m.h, using the catalyst of example 1 and after selectively dewaxing the hydrotreating product, a lubricant base oil having a viscosity index of only 90 is obtained.
    Example 8. In order to obtain a bright stock with a kinematic viscosity of 25.2 cSt, with deasphalted oil (520 C) obtained from Iranian heavy oil and having a nitrogen content of 1956 mg / kg, is subjected to an extraction treatment with furfurol prior to catalytic hydrotreating. The extraction is carried out at a solvent / feedstock ratio of 2.0.
    The intermediate product has a nitrogen content of 1010 mg / kg. It is hydrotreated using a catalyst as in example 1, with a partial pressure of hydrogen of 140 bar, a space velocity of 0.6 t / m and 380 C.
    After selective dewaxing of the hydrotreating fraction, the targeted BrightStock is recovered. The resulting bright drain has a viscosity factor of 97.5,
    The required minimum depth of extraction corresponds to an intermediate product with an azo content of 1050 mg / kg. Thus, the cell was extracted with furfural up to 0.96 of the maximum allowable nitrogen content.
    In order to demonstrate the process of producing a lubricant base oil under non-optimal conditions, the above raw material is directly hydrotreated without an extraction step. After hydrotreating the raw material at 380 ° C, a partial pressure of hydrogen of 140 bar and a volume velocity of 0.6 t / m. Using a catalyst in Example 1, and after the solvent deparaffinization of the Hydrotreating product, the boitstock having a viscosity coefficient of only 86 is obtained below.
    权利要求:
    Claims (1)
    [1]
    Invention Formula
    The method of producing lubricant base oils from distillate petroleum fractions or deasphalted petroleum fractions by extraction with furfural at 81-110 0, furfural mass ratio of 0.8-2.4, followed by hydrotreating of the resulting raffinate the presence of a catalyst containing metals VI B and VIII of the Periodic Table of Elements, followed by dewaxing of the isolated from the
    Hydrotreating oil fractions, characterized in that, in order to improve the quality and yield of the target product, the initial quantity containing nitrogen in an amount exceeding the value calculated by the formula f-Pyi -Sy where f is the viscosity coefficient of the target base oil,
    2.15-t-O, 12), oo
    where V, 04 is the kinematic viscosity at 100 ° C, cSt, and in the case of obtaining the target lubricating residual base oil is 4.5; P n the partial pressure of hydrogen Hydrotreating process, bar; S V is the feed rate of the starting feed, t / h per 1 m of hydrotreating catalyst, is subjected to extraction to a nitrogen content in the obtained raffin of 0.3-0.96 from the value calculated using this formula.
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    同族专利:
    公开号 | 公开日
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    ZA857823B|1986-05-28|
    DE3586887D1|1993-01-21|
    SG9594G|1994-04-15|
    AU4848885A|1986-04-17|
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    EP0178710A3|1987-12-02|
    NO167515B|1991-08-05|
    GB8425837D0|1984-11-21|
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    DK463185A|1986-04-13|
    CA1249538A|1989-01-31|
    JPS6197386A|1986-05-15|
    DK463185D0|1985-10-10|
    HU196448B|1988-11-28|
    AR243922A1|1993-09-30|
    US4622129A|1986-11-11|
    NO854026L|1986-04-14|
    CN85107475A|1986-04-10|
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    HUT44067A|1988-01-28|
    KR930011067B1|1993-11-20|
    AU572001B2|1988-04-28|
    YU161285A|1987-12-31|
    BR8505038A|1986-07-29|
    KR860003330A|1986-05-23|
    MX168425B|1993-05-25|
    CN1007732B|1990-04-25|
    YU45746B|1992-07-20|
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    法律状态:
    2007-09-20| REG| Reference to a code of a succession state|Ref country code: RU Ref legal event code: MM4A Effective date: 20041011 |
    优先权:
    申请号 | 申请日 | 专利标题
    GB848425837A|GB8425837D0|1984-10-12|1984-10-12|Manufacture of lubricating base oils|
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