AR054338A1 - Hidroisomerato parafinico como modificador de cristal de cera - Google Patents

Hidroisomerato parafinico como modificador de cristal de cera

Info

Publication number
AR054338A1
AR054338A1 ARP060101330A ARP060101330A AR054338A1 AR 054338 A1 AR054338 A1 AR 054338A1 AR P060101330 A ARP060101330 A AR P060101330A AR P060101330 A ARP060101330 A AR P060101330A AR 054338 A1 AR054338 A1 AR 054338A1
Authority
AR
Argentina
Prior art keywords
paraffinal
hydroisomerate
glass modifier
wax glass
wax
Prior art date
Application number
ARP060101330A
Other languages
English (en)
Original Assignee
Exxonmobil Res & Eng Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Exxonmobil Res & Eng Co filed Critical Exxonmobil Res & Eng Co
Publication of AR054338A1 publication Critical patent/AR054338A1/es

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
    • C10G73/00—Recovery or refining of mineral waxes, e.g. montan wax
    • C10G73/02—Recovery of petroleum waxes from hydrocarbon oils; Dewaxing of hydrocarbon oils
    • 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
    • C10G73/00—Recovery or refining of mineral waxes, e.g. montan wax
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L1/00—Liquid carbonaceous fuels
    • C10L1/04—Liquid carbonaceous fuels essentially based on blends of hydrocarbons
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L1/00—Liquid carbonaceous fuels
    • C10L1/10—Liquid carbonaceous fuels containing additives
    • C10L1/14—Organic compounds
    • C10L1/16—Hydrocarbons
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L1/00—Liquid carbonaceous fuels
    • C10L1/10—Liquid carbonaceous fuels containing additives
    • C10L1/14—Organic compounds
    • C10L1/16—Hydrocarbons
    • C10L1/1691—Hydrocarbons petroleum waxes, mineral waxes; paraffines; alkylation products; Friedel-Crafts condensation products; petroleum resins; modified waxes (oxidised)
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L10/00—Use of additives to fuels or fires for particular purposes
    • C10L10/14—Use of additives to fuels or fires for particular purposes for improving low temperature properties
    • C10L10/16—Pour-point depressants
    • 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
    • C10M111/00—Lubrication compositions characterised by the base-material being a mixture of two or more compounds covered by more than one of the main groups C10M101/00 - C10M109/00, each of these compounds being essential
    • C10M111/04—Lubrication compositions characterised by the base-material being a mixture of two or more compounds covered by more than one of the main groups C10M101/00 - C10M109/00, each of these compounds being essential at least one of them being a macromolecular organic compound
    • 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
    • C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
    • C10M169/04—Mixtures of base-materials and additives
    • C10M169/041—Mixtures of base-materials and additives the additives being macromolecular compounds only
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L1/00—Liquid carbonaceous fuels
    • C10L1/10—Liquid carbonaceous fuels containing additives
    • C10L1/14—Organic compounds
    • C10L1/16—Hydrocarbons
    • C10L1/1616—Hydrocarbons fractions, e.g. lubricants, solvents, naphta, bitumen, tars, terpentine
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
    • C10M2205/02—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers
    • C10M2205/022—Ethene
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
    • C10M2205/02—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers
    • C10M2205/022—Ethene
    • C10M2205/0225—Ethene used as base material
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
    • C10M2205/17—Fisher Tropsch reaction products
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
    • C10M2205/17—Fisher Tropsch reaction products
    • C10M2205/173—Fisher Tropsch reaction products used as base material
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
    • C10N2030/08—Resistance to extreme temperature

Landscapes

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

Abstract

Fracciones pesadas de lubricantes parafínicos producidos sobre catalizadores de descerificacion son efectivas como modificadores de cristal de cera por ser hidrocarburos a pesar de que dichas fracciones pesadas poseen puntos de fluidez por encima de aquellos del hidrocarburo líquido.
ARP060101330A 2005-04-05 2006-04-04 Hidroisomerato parafinico como modificador de cristal de cera AR054338A1 (es)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US66838405P 2005-04-05 2005-04-05
US11/374,726 US20060219597A1 (en) 2005-04-05 2006-03-14 Paraffinic hydroisomerate as a wax crystal modifier

Publications (1)

Publication Number Publication Date
AR054338A1 true AR054338A1 (es) 2007-06-20

Family

ID=37069027

Family Applications (1)

Application Number Title Priority Date Filing Date
ARP060101330A AR054338A1 (es) 2005-04-05 2006-04-04 Hidroisomerato parafinico como modificador de cristal de cera

Country Status (12)

Country Link
US (1) US20060219597A1 (es)
EP (1) EP1885824A4 (es)
JP (1) JP2008534772A (es)
KR (1) KR20070116968A (es)
AR (1) AR054338A1 (es)
AU (1) AU2006252955B2 (es)
BR (1) BRPI0609740A2 (es)
CA (1) CA2603846A1 (es)
NO (1) NO20075450L (es)
SG (1) SG160422A1 (es)
TW (1) TW200708613A (es)
WO (1) WO2006130219A2 (es)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080053868A1 (en) * 2005-06-22 2008-03-06 Chevron U.S.A. Inc. Engine oil compositions and preparation thereof
JP5466151B2 (ja) * 2007-05-31 2014-04-09 セイソル テクノロジー （プロプライエタリー） リミテッド 留分置換によるディーゼル燃料の低温流れ応答
RU2494140C2 (ru) * 2007-08-13 2013-09-27 Шелл Интернэшнл Рисерч Маатсхаппий Б.В. Смесь смазочного масла и способ ее получения
CN101821364B (zh) * 2007-09-28 2013-07-31 日本石油天然气·金属矿物资源机构 柴油燃料基材的制造方法及得到的柴油燃料基材
US20090143261A1 (en) * 2007-11-30 2009-06-04 Chevron U.S.A. Inc. Engine Oil Compositions with Improved Fuel Economy Performance
US8152869B2 (en) * 2007-12-20 2012-04-10 Shell Oil Company Fuel compositions
WO2009080673A2 (en) * 2007-12-20 2009-07-02 Shell Internationale Research Maatschappij B.V. Fuel compositions
EP2078743A1 (en) * 2008-01-10 2009-07-15 Shell Internationale Researchmaatschappij B.V. Fuel composition
KR102628686B1 (ko) * 2018-03-27 2024-01-25 에네오스 가부시키가이샤 왁스 이성화유

Family Cites Families (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB742267A (en) * 1952-04-09 1955-12-21 California Research Corp Improvements in or relating to lubricating oils and processes for preparing the same
US3792983A (en) * 1968-04-01 1974-02-19 Exxon Research Engineering Co Ethylene and acrylate esters, their preparation and their use as wax crystal modifiers
US4240916A (en) * 1976-07-09 1980-12-23 Exxon Research & Engineering Co. Pour point depressant additive for fuels and lubricants
US4514314A (en) * 1981-06-02 1985-04-30 Exxon Research And Engineering Co. Oil soluble ester pour point depressant additive for lubricants
US4880553A (en) * 1985-12-30 1989-11-14 The Lubrizol Corporation Methylene linked aromatic pour point depressant
US4943672A (en) * 1987-12-18 1990-07-24 Exxon Research And Engineering Company Process for the hydroisomerization of Fischer-Tropsch wax to produce lubricating oil (OP-3403)
US5641736A (en) * 1995-09-28 1997-06-24 Mobil Oil Corporation Synergistic pour point depressant combinations and hydrocarbon lube mixtures
US6080301A (en) * 1998-09-04 2000-06-27 Exxonmobil Research And Engineering Company Premium synthetic lubricant base stock having at least 95% non-cyclic isoparaffins
US6332974B1 (en) * 1998-09-11 2001-12-25 Exxon Research And Engineering Co. Wide-cut synthetic isoparaffinic lubricating oils
AU765274B2 (en) * 1998-10-05 2003-09-11 Sasol Technology (Pty) Ltd. Process for producing middle distillates and middle distillates produced by that process
US6255261B1 (en) * 1999-09-22 2001-07-03 Ethyl Corporation (Meth) acrylate copolymer pour point depressants
US6787022B1 (en) * 2000-05-02 2004-09-07 Exxonmobil Research And Engineering Company Winter diesel fuel production from a fischer-tropsch wax
MY139353A (en) * 2001-03-05 2009-09-30 Shell Int Research Process to prepare a lubricating base oil and a gas oil
US6699385B2 (en) * 2001-10-17 2004-03-02 Chevron U.S.A. Inc. Process for converting waxy feeds into low haze heavy base oil
US6605206B1 (en) * 2002-02-08 2003-08-12 Chevron U.S.A. Inc. Process for increasing the yield of lubricating base oil from a Fischer-Tropsch plant
EP1487942B2 (en) * 2002-02-25 2011-08-24 Shell Internationale Research Maatschappij B.V. Process to prepare a catalytically dewaxed gas oil or gas oil blending component
US6774272B2 (en) * 2002-04-18 2004-08-10 Chevron U.S.A. Inc. Process for converting heavy Fischer Tropsch waxy feeds blended with a waste plastic feedstream into high VI lube oils
EP1516037A1 (en) * 2002-06-26 2005-03-23 Shell Internationale Researchmaatschappij B.V. Lubricant composition
US6703353B1 (en) * 2002-09-04 2004-03-09 Chevron U.S.A. Inc. Blending of low viscosity Fischer-Tropsch base oils to produce high quality lubricating base oils
US7201838B2 (en) * 2002-10-08 2007-04-10 Exxonmobil Research And Engineering Company Oxygenate treatment of dewaxing catalyst for greater yield of dewaxed product
US7132042B2 (en) * 2002-10-08 2006-11-07 Exxonmobil Research And Engineering Company Production of fuels and lube oils from fischer-tropsch wax
US20040065582A1 (en) * 2002-10-08 2004-04-08 Genetti William Berlin Enhanced lube oil yield by low hydrogen pressure catalytic dewaxing of paraffin wax
US6846778B2 (en) * 2002-10-08 2005-01-25 Exxonmobil Research And Engineering Company Synthetic isoparaffinic premium heavy lubricant base stock
US20040065584A1 (en) * 2002-10-08 2004-04-08 Bishop Adeana Richelle Heavy lube oil from fischer- tropsch wax
US7344631B2 (en) * 2002-10-08 2008-03-18 Exxonmobil Research And Engineering Company Oxygenate treatment of dewaxing catalyst for greater yield of dewaxed product
US7144497B2 (en) * 2002-11-20 2006-12-05 Chevron U.S.A. Inc. Blending of low viscosity Fischer-Tropsch base oils with conventional base oils to produce high quality lubricating base oils
US20040159582A1 (en) * 2003-02-18 2004-08-19 Simmons Christopher A. Process for producing premium fischer-tropsch diesel and lube base oils
US6962651B2 (en) * 2003-03-10 2005-11-08 Chevron U.S.A. Inc. Method for producing a plurality of lubricant base oils from paraffinic feedstock
US20040256286A1 (en) * 2003-06-19 2004-12-23 Miller Stephen J. Fuels and lubricants using layered bed catalysts in hydrotreating waxy feeds, including Fischer-Tropsch wax
WO2005004739A2 (en) * 2003-06-30 2005-01-20 Instabar Technologies, Llc Dental prosthesis support and method
US7018525B2 (en) * 2003-10-14 2006-03-28 Chevron U.S.A. Inc. Processes for producing lubricant base oils with optimized branching
US7053254B2 (en) * 2003-11-07 2006-05-30 Chevron U.S.A, Inc. Process for improving the lubricating properties of base oils using a Fischer-Tropsch derived bottoms

Also Published As

Publication number Publication date
BRPI0609740A2 (pt) 2011-10-18
KR20070116968A (ko) 2007-12-11
AU2006252955B2 (en) 2011-06-16
WO2006130219A3 (en) 2008-01-17
EP1885824A2 (en) 2008-02-13
CA2603846A1 (en) 2006-12-07
SG160422A1 (en) 2010-04-29
AU2006252955A1 (en) 2006-12-07
US20060219597A1 (en) 2006-10-05
NO20075450L (no) 2007-10-29
WO2006130219A2 (en) 2006-12-07
JP2008534772A (ja) 2008-08-28
EP1885824A4 (en) 2009-09-02
TW200708613A (en) 2007-03-01

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