US3627673A - Process for producing low-pour point transformer oils from waxy crudes - Google Patents

Process for producing low-pour point transformer oils from waxy crudes Download PDF

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US3627673A
US3627673A US794688*A US3627673DA US3627673A US 3627673 A US3627673 A US 3627673A US 3627673D A US3627673D A US 3627673DA US 3627673 A US3627673 A US 3627673A
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percent
fraction
pour point
oil
vacuum gas
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US794688*A
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Lorne W Sproule
Donald W Murray
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ExxonMobil Technology and Engineering Co
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Exxon Research and Engineering Co
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/20—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances liquids, e.g. oils
    • H01B3/22—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances liquids, e.g. oils hydrocarbons
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M101/00—Lubricating compositions characterised by the base-material being a mineral or fatty oil
    • C10M101/02—Petroleum fractions
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
    • C10M2203/06—Well-defined aromatic compounds
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
    • C10M2203/10—Petroleum or coal fractions, e.g. tars, solvents, bitumen
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
    • C10M2203/10—Petroleum or coal fractions, e.g. tars, solvents, bitumen
    • C10M2203/102—Aliphatic fractions
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/02—Hydroxy compounds
    • C10M2207/023—Hydroxy compounds having hydroxy groups bound to carbon atoms of six-membered aromatic rings
    • C10M2207/026—Hydroxy compounds having hydroxy groups bound to carbon atoms of six-membered aromatic rings with tertiary alkyl groups
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/14—Electric or magnetic purposes
    • C10N2040/16—Dielectric; Insulating oil or insulators
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/14—Electric or magnetic purposes
    • C10N2040/17—Electric or magnetic purposes for electric contacts

Definitions

  • the dewaxed oil may be hydrofined before fractionation to improve color. stability and sulfur content.
  • the insulating oil fraction is obtained from the dewaxed oil as a heart cut.
  • the bottoms fraction may be used as a lubricating oil, and the pour point of this fraction can be improved with further fractionation.
  • the high-boiling waxy contaminants picked up during processing are removed as bottoms, thus yielding a product having an improved pour point when compared with an oil prepared by fractionation prior to dewaxing,
  • This invention relates to a method of preparing high-stability insulating oils. More particularly, this invention relates to an improved method for preparing high-stability insulating oils having high-flash points and low-pour points from parafiinic distillates. Still more particularly, this invention relates to a method wherein high-stability insulating oils are cut with a high degree of fractionation from a previously dewaxed, broad hydrocarbon oil fraction from a parafi'inic crude.
  • High-stability insulating oils are known in the prior art and are used in transformers and other electrical equipment such as circuit breakers. These oils are 2by (l) a relatively low viscosity, (2) a high-dielectric strength, (3) a relatively highflash point, and (4) a low-pour point. In addition, these oils must be low in corrosive agents such as acid, alkali, and sulfur and resistant to oxidation and sludge formation.
  • insulating oils are known in the prior art. In general, they are produced from wax-free naphthenic crude oils which are not native to many parts of the world and consequently command premium prices and involve high transportation costs. Although these crudes permit production of exceptionally low-pour point insulating oils without the need for dewaxing or special attention to the degree of fractionation or distillate cut width, they also contain high percentages of sulfur and nitrogen which must be removed in order to satisfy the stringent stability requirements of insulating oils.
  • the foregoing and other objects are accomplished by separating the insulating oil fraction from a previously dewaxed oil fraction.
  • the previously dewaxed fraction which contains the desired insulating oil fraction as a heart cut, is treated to remove aromatic and polar components prior to the dewaxing step.
  • the dewaxed fraction is then hydrofined to improve color and oxidation stability prior to the fractionation step.
  • FIG. 1 is a flow diagram of the complete insulating oil preparation process.
  • FIG. 2 is a detailed drawing of the fractional distillation tower used to separate both the insulating oil fraction and a low-pour point light lube from the broad, dewaxedhydrocarbon oil containing these fractions.
  • a wax-containing crude oil is fed through line 1, to a crude distillation unit 11, wherein the crude oil is fractionated into several cuts.
  • the crude cut containing the insulating oil fraction is taken from the vacuum portion of the crude still through line 2, and transferred to an extraction unit 12, wherein the aromatic and polar components content of the vacuum oil fraction is reduced by selective extraction.
  • the extraction solvent enters the extraction unit 12 through line 3, and leaves through line 4.
  • the raffinate goes overhead through line 5 to the dewaxer 13.
  • the wax content of the vacuum oil fraction is reduced to the desired level by cooling to a predetermined temperature. As is well known in the art, the cooling causes precipitation of the wax, which is then removed by filtration.
  • the wax-containing oil is diluted with a suitable solvent prior to the dewaxing step.
  • the dewaxing solvent will enter the dewaxer 13 through line 6.
  • the diluted oil containing precipitated wax leaves the dewaxer through line 7.
  • the wax is then separated from the diluted oil by conventional means such as filtration, l4, and the diluent is flashed off by the use of suitable means, 15.
  • the dewaxed oil then enters a hydrofiner, 16, through line 8.
  • the hydrofined oil fraction is then transferred through line 9 to a fractional distillation tower 17 wherein the insulating oil fraction is separated as a heart cut, leaving the distillation tower through line 10(b).
  • the lighter components which are unsuitable for use as an insulating oil pass overhead and leave the fractional distillation tower through 10(4).
  • the heavier fraction which may be used as a lubricating oil contains the high-boiling wax contaminants and is removed from the fractional distillation tower as bottoms through line 10(0). As is shown in FIG. 2, the heavier fraction can be further separated into two streams. In this embodiment the high-boiling, waxy contaminants are removed as bottoms through 10(d). The remaining portion of the heavy fraction is removed through line 10(c) and is suitable for use as a low-pour point lubricating oil.
  • a high-stability insulating oil fraction can be recovered from any waxy paraffinic crude.
  • Such crude oils are obtained from Western Canada, Saudi Arabia, Kuwait, the Panhandle, North Louisiana, Tia Juana, etc.
  • the vacuum gas oil fraction which is taken from the crude distillation unit, will, in general, have a 50 to percent boiling range of 550 to 750 F.
  • the pour point of this fraction will, generally, be between 35 and 70 F.
  • This cut will, obviously, contain the insulating oil fraction sought to be recovered in the present invention. It is important, however, that this fraction containing the insulating oil fraction as a heart cut; i.e., that the vacuum gas oil fraction contain both lowerand higher-boiling materials.
  • the aromatic and polar components are removed from the vacuum gas oil fraction by contacting this fraction with a solvent having a preferential selectivity for these constituents.
  • solvents such as phenol, furfural and the like are used in these processes.
  • the temperature employed is, generally, in the range of 120 to 250 F. while pressures are in the range of about atmospheric to 250 p.s.i.g. in general, the solvent flows downwardly and countercurrently contacts the upflowing oil under conditions wherein the more aromatic and polar-type constituents are dissolved in the solvent.
  • the solvent extract phase is removed from the extraction zone and is processed to segregate the solvent from the aromatic and polar type compounds. The solvent is then recycled to the treating zone. Moreover, any solvent which may be entrained in the rafi'inate phase is separated prior to the dewaxing step.
  • the dewaxing step is accomplished by means well known in the prior art.
  • the vacuum gas oil fraction may be contacted with any one or more of a number of suitable dewaxing solvents such as liquid propane, methyl ethyl ltetone, methyl isobutyl ketone, or mixtures thereof to secure a product having a pour point between the range of +20to 25 F.
  • suitable dewaxing solvents such as liquid propane, methyl ethyl ltetone, methyl isobutyl ketone, or mixtures thereof to secure a product having a pour point between the range of +20to 25 F.
  • the temperature to which the solvent oil mixture is cooled will be between +20 and 40 F.
  • the pour point of the final insulating oil product will depend upon both the dewaxing temperature and the particular solvent or solvents employed.
  • the hydrofining step may be accomplished by contacting the dewaxed oil with a suitable hydrofining catalyst containing the sulfides or oxides of such combinations of metals as cobalt and molybdenum. nickel and molybdenum, nickel and tungsten, etc. in general, the hydrofining will be accomplished by passing the dewaxed oil over a fixed bed at a space velocity of between 0.3 and 3.0 v./v./hr., a temperature between 350 and 650 F. and under a hydrogen pressure between 300 and 900p.s.i.g.
  • the purpose of this step is to improve color, oxidation stability and sulfur content of the vacuum gas oil. it should be clear, that this step may be omitted.
  • the fractionation of the dewaxed vacuum gas oil fraction is most advantageously effected by an efficient fractional distillation carried out in such a manner so as to produce a relatively sharp separation between the fractions such as to separate the dewaxed vacuum gas oil fraction into at least three fractions.
  • the insulating oil fraction should be cut so as to have a 5 to 95 percent boiling range between 600 and 700 F. It will be appreciated that the exact boiling range of this fraction will depend upon the specifications sought to be met.
  • the higher-boiling fraction will, in general, have a 5 to 95 percent boiling range between 680 and 770 F. This fraction will contain the high-boiling contaminants accumulated in the prior processing steps, but can be used directly as a light lube oil.
  • the pour point of this material will range between 0 and 20 F. if desired, the pour point of this material can be improved by further fractionation.
  • the pour TAB LE point can be brought within the range of 20 to 50 F. by taking a second side stream product from the tower and removing the high-boiling contaminants as the bottoms product.
  • the bottoms product will range between 3 and 20 percent of the total vacuum gas oil fraction and will have a boiling range between 700 and 1,000 F., the upper limit depending on the amount and type of contamination present.
  • EXAMPLE 1 With reference to H0. 1, in this example, a waxy Western Canadian crude (Pembina) was fed through line 1. to a conventional refinery crude distillation unit ll. A vacuum gas oil fraction comprising 2.67 percent of the crude feed and having a 5 to percent boiling range of 579-715 F. was recovered through line 2. The boiling range of this fraction was determined in a 15-plate distillation column operated at a 5 to l reflux ratio. The pour point of the vacuum gas oil fraction was +50 F. The vacuum gas oil fraction was then fed to an extraction unit 12, wherein the excess aromatic and polar components were removed by phenol extraction. The volume ratio of phenol, entering through line 3, and the vacuum gas oil fraction entering through line 2 was 1.2 to 1.
  • the yield was 72 percent based on feed to the dewaxing unit of a dewaxed oil having a pour point of -1 5 F., a cloud point of 12 F., a gravity of 340 API, and a viscosity of 55.1 SUS at F. It contained about 14 percent of aromatic components and 0.07 percent sulfur.
  • the dewaxed oil was then hydrofined by contacting with a typical sulfided cobalt-molybdate catalyst to improve its color and oxidation stability and to reduce its sulfur content.
  • the dewaxed oil was fed through line 8 to the hydrofiner 16.
  • a space velocity of 1.0 v./v./hr., a temperature of 450 F and a hydrogen pressure of 400 p.s.i.g. were used.
  • the product obtained through line 9 had a sulfur content of 0.035 percent.
  • the hydrofined product was then fed through line 9 to the fractional distillation tower 17.
  • the fractionation column was designed such that the degree of separation was equivalent to that which would be obtained by the use of a l5-plate batch column operated at a 2 to 1 reflux ratio. In the preferred embodiment, four fractions were taken from this column; (a) the fractipn distilling below 621 F.
  • the fraction (0) meets all specifications for a low pour point. light lube oil.
  • EXAMPLE 2 This example was carried out on the same feed and same conditions as set forth in example 1, except that only three fractions were obtained in the final distillation step. These fractions were: (a) the fraction distilling below 621 F. (29.6 LV percent), (b) the fraction distilling between 621 and 685 F. (49.8 LV percent), and (c) the residual fraction (20.6 LV percent). These fractions had the following 5 to 95 percent boiling ranges as determined by a 15/5 distillation: (a) 553 to 635 F., (b) 616 to 685 F., and (c) 678 to 748 F. Their pour points and viscosities at 100 F.
  • fraction (b) has properties identical with those of the insulating oil fraction obtained in example 1.
  • the fraction (c) has a slightly higher pour point and viscosity but was obtained in higher yields and still meets specifications as a 1ight-1ubricating oil.
  • EXAMPLE 3 In this example, the feedstock and conditions were the same as those in example 1, except that the hydrofining step was omitted.
  • the insulating oil fraction, fraction (b) was obtained with a boiling range of 610 to 682 F. in a yield of 49.9 LV percent. This fraction had a viscosity of 57.0 SUS at 100 F. and a pour point of -55 F. without pour depressants. 1ts oxidation stability was, however, inferior to that of the oil which was hydrofined before distillation. It will be apparent that either of the product streams obtained by the process of this invention may be used directly as either an insulating oil or a light lube oil.
  • oxidation inhibitors include the butylated hydroxytoluenes
  • suitable pour point depressants include the polyacrylates, wax-alkylated naphthalenes, etc.
  • hydrofining said dewaxed, extracted vacuum gas oil fraction with hydrogen and a hydrogenation catalyst said catalyst comprising hydrogenation components selected from the group consisting of the oxides and sulfides of metals of the sixth and eighth groups of the Periodic Table and mixtures thereof, and
  • a process for preparing a ow-pour point insulating 011 which comprises the steps of (1) solvent-extracting a broad waxy parafi'mic vacuum gas oil fraction having a 5 LV percent to 95 LV percent boiling range of 550750 F. at atmospheric pressure, (2) dewaxing said extracted vacuum gas oil fraction to a pour point between the range of+20 to 25 F., and then (3) distilling the dewaxed fractions and recovering as a heart cut an insulating oil fraction having a 5 LV percent to 95 LV percent boiling range of 580-720 F. at atmospheric pressure, thus obtaining further pour point improvement relative to step 2.

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  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (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)
  • Lubricants (AREA)
  • Organic Insulating Materials (AREA)
US794688*A 1969-01-28 1969-01-28 Process for producing low-pour point transformer oils from waxy crudes Expired - Lifetime US3627673A (en)

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US (1) US3627673A (enrdf_load_stackoverflow)
JP (1) JPS4946123B1 (enrdf_load_stackoverflow)
CA (1) CA946313A (enrdf_load_stackoverflow)
DE (1) DE2003533A1 (enrdf_load_stackoverflow)
FR (1) FR2030202B1 (enrdf_load_stackoverflow)
GB (1) GB1274811A (enrdf_load_stackoverflow)
NL (1) NL7001189A (enrdf_load_stackoverflow)
NO (1) NO130773C (enrdf_load_stackoverflow)

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5148200A (en) * 1974-10-23 1976-04-24 Nippon Oil Co Ltd Denkizetsuenyuno seizohoho
DE2634436A1 (de) * 1975-07-30 1977-02-10 Nippon Oil Co Ltd Elektrische isolieroele
US4018666A (en) * 1975-07-28 1977-04-19 Exxon Research And Engineering Company Process for producing low pour point transformer oils from paraffinic crudes
US4069165A (en) * 1975-04-09 1978-01-17 Nippon Oil Company, Ltd. Electrical insulating oils
US4069166A (en) * 1975-06-20 1978-01-17 Nippon Oil Company, Ltd. Electrical insulating oils
US4070297A (en) * 1976-02-03 1978-01-24 Nippon Oil Co., Ltd. Electrical insulating oil compositions
US4124489A (en) * 1977-02-16 1978-11-07 Exxon Research & Engineering Co. Production of transformer oil feed stocks from waxy crudes
US4137148A (en) * 1977-07-20 1979-01-30 Mobil Oil Corporation Manufacture of specialty oils
US4181598A (en) * 1977-07-20 1980-01-01 Mobil Oil Corporation Manufacture of lube base stock oil
US4303499A (en) * 1976-09-11 1981-12-01 Deutsche Texaco Aktiengesellschaft Process for the production of a transformer oil
US4770763A (en) * 1986-06-23 1988-09-13 Nippon Mining Co., Ltd. Process for producing lubricant base oil
US5474668A (en) * 1991-02-11 1995-12-12 University Of Arkansas Petroleum-wax separation
US5620588A (en) * 1991-02-11 1997-04-15 Ackerson; Michael D. Petroleum-wax separation
US5840175A (en) * 1997-08-29 1998-11-24 Exxon Research And Engineering Company Process oils and manufacturing process for such using aromatic enrichment with extraction followed by single stage hydrofinishing
US20080308461A1 (en) * 2005-12-30 2008-12-18 Abb Research Ltd. Method for On-Line Removal of Corrosive Components of Transformer Oil
CN103305268A (zh) * 2012-03-09 2013-09-18 中国石油天然气股份有限公司 一种降低变压器油基础油凝点的方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1103913A (en) * 1976-08-24 1981-06-30 Jerry Ourlian Insulating oil
JPS61162554U (enrdf_load_stackoverflow) * 1985-03-29 1986-10-08

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3014859A (en) * 1958-07-28 1961-12-26 Exxon Research Engineering Co Solvent dewaxing process
US3095366A (en) * 1960-03-03 1963-06-25 Standard Oil Co Insulating oil
US3224955A (en) * 1962-12-18 1965-12-21 Shell Oil Co Lubricating oil process
US3382168A (en) * 1965-03-01 1968-05-07 Standard Oil Co Process for purifying lubricating oils by hydrogenation
US3438887A (en) * 1967-07-11 1969-04-15 Texaco Inc Production of lubricating oils
US3481863A (en) * 1966-07-14 1969-12-02 Gulf Research Development Co Refining high sulfur lubricating oil charge stocks

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3014859A (en) * 1958-07-28 1961-12-26 Exxon Research Engineering Co Solvent dewaxing process
US3095366A (en) * 1960-03-03 1963-06-25 Standard Oil Co Insulating oil
US3224955A (en) * 1962-12-18 1965-12-21 Shell Oil Co Lubricating oil process
US3382168A (en) * 1965-03-01 1968-05-07 Standard Oil Co Process for purifying lubricating oils by hydrogenation
US3481863A (en) * 1966-07-14 1969-12-02 Gulf Research Development Co Refining high sulfur lubricating oil charge stocks
US3438887A (en) * 1967-07-11 1969-04-15 Texaco Inc Production of lubricating oils

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5148200A (en) * 1974-10-23 1976-04-24 Nippon Oil Co Ltd Denkizetsuenyuno seizohoho
US4008148A (en) * 1974-10-23 1977-02-15 Nippon Oil Company Ltd. Method for the preparation of insulating oil
US4069165A (en) * 1975-04-09 1978-01-17 Nippon Oil Company, Ltd. Electrical insulating oils
US4069166A (en) * 1975-06-20 1978-01-17 Nippon Oil Company, Ltd. Electrical insulating oils
US4018666A (en) * 1975-07-28 1977-04-19 Exxon Research And Engineering Company Process for producing low pour point transformer oils from paraffinic crudes
DE2634436A1 (de) * 1975-07-30 1977-02-10 Nippon Oil Co Ltd Elektrische isolieroele
US4062791A (en) * 1975-07-30 1977-12-13 Nippon Oil Co., Ltd. Electrical insulating oil
US4070297A (en) * 1976-02-03 1978-01-24 Nippon Oil Co., Ltd. Electrical insulating oil compositions
US4303499A (en) * 1976-09-11 1981-12-01 Deutsche Texaco Aktiengesellschaft Process for the production of a transformer oil
US4124489A (en) * 1977-02-16 1978-11-07 Exxon Research & Engineering Co. Production of transformer oil feed stocks from waxy crudes
DE2831968A1 (de) * 1977-07-20 1979-02-08 Mobil Oil Corp Verfahren zur herstellung von qualitativ hochwertigem spezialoel
FR2398106A1 (fr) * 1977-07-20 1979-02-16 Mobil Oil Procede de fabrication d'huiles visqueuses a partir de fractions de petrole brut
US4181598A (en) * 1977-07-20 1980-01-01 Mobil Oil Corporation Manufacture of lube base stock oil
US4137148A (en) * 1977-07-20 1979-01-30 Mobil Oil Corporation Manufacture of specialty oils
US4770763A (en) * 1986-06-23 1988-09-13 Nippon Mining Co., Ltd. Process for producing lubricant base oil
US5474668A (en) * 1991-02-11 1995-12-12 University Of Arkansas Petroleum-wax separation
US5620588A (en) * 1991-02-11 1997-04-15 Ackerson; Michael D. Petroleum-wax separation
US5853564A (en) * 1991-02-11 1998-12-29 University Of Arkansas Petroleum-wax separation
US6024862A (en) * 1991-02-11 2000-02-15 Advanced Refining Technologies, Inc. Petroleum-wax separation
US5840175A (en) * 1997-08-29 1998-11-24 Exxon Research And Engineering Company Process oils and manufacturing process for such using aromatic enrichment with extraction followed by single stage hydrofinishing
US20080308461A1 (en) * 2005-12-30 2008-12-18 Abb Research Ltd. Method for On-Line Removal of Corrosive Components of Transformer Oil
CN103305268A (zh) * 2012-03-09 2013-09-18 中国石油天然气股份有限公司 一种降低变压器油基础油凝点的方法

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NO130773B (enrdf_load_stackoverflow) 1974-10-28
JPS4946123B1 (enrdf_load_stackoverflow) 1974-12-07
DE2003533A1 (de) 1970-08-27
CA946313A (en) 1974-04-30
FR2030202A1 (enrdf_load_stackoverflow) 1970-10-30
NO130773C (enrdf_load_stackoverflow) 1975-02-05
FR2030202B1 (enrdf_load_stackoverflow) 1974-02-01
GB1274811A (en) 1972-05-17
NL7001189A (enrdf_load_stackoverflow) 1970-07-30

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