US2348459A - Process for producing oils with low pour points - Google Patents

Process for producing oils with low pour points Download PDF

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Publication number
US2348459A
US2348459A US248874A US24887438A US2348459A US 2348459 A US2348459 A US 2348459A US 248874 A US248874 A US 248874A US 24887438 A US24887438 A US 24887438A US 2348459 A US2348459 A US 2348459A
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United States
Prior art keywords
wax
solvent
oil
temperature
hydrocarbons
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Expired - Lifetime
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US248874A
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English (en)
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Engel Bruno
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SEPARATOR NOBEL AB
SEPARATOR-NOBEL AB
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SEPARATOR NOBEL AB
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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
    • C10G21/00—Refining of hydrocarbon oils, in the absence of hydrogen, by extraction with selective solvents
    • 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
    • C10G73/06—Recovery of petroleum waxes from hydrocarbon oils; Dewaxing of hydrocarbon oils with the use of solvents

Definitions

  • the obtained extract is a concentrate of viscosity bearers rich in aromatics, which renders diicult the precipitation of. soft wax, etc., in the same manner as takes place on addition of so-called pour point reducers. Consequently the second separating stage, that is, the division into solid wax and par-v alinic lubricating oil components, can be carried out at comparatively high temperatures.
  • the pour point of the hydrocarbons is substantially lowered, and simultaneously the viscosity index of the dewaxed primary oil or extract and the total yield of oil are considerably raised.
  • This process is advantageously carried out in continuous operation in centrifuges, as indicated in the following example.
  • a is a tank for blending the distillate with the selective solvent; b, c, c, chillers; d a centrifugal separator in which is separated the primary dewaxed oil dissolved in a minor proportion of the solvent from the mixture of solid and fluid hydrocarbons (theprimary wax) and the bulk of the solvent; c a still for distilling off the solvent (whichA is returned to the solvent storage tank .f through line g) from the extract; h a heat exchanger whereraising the pour Ain the temperature of the diluted primary wax is raised, usually Vfrom 20 to 25 C., to obtain a mixture of solid crystalline wax and a solution of fluid wax hydrocarbons and solvent, i the centrifuge in which the solid crystalline wax and some of the solvent are separated from the solution of uid parainicv oil and the remainder of the solvent; Ic the still in which the solvent is separated from the said parafnic oil;
  • the selective effect of the dewaxing agents herein considered may also be utilized for obtaining substances which have the same qualities as the so-called pour point reducers sold in the open market. It has been found, in connection with the dewaxing of (particularly) mixed base oils or distillates with, for instance, dichloretnane, dichlorethylene, methylenechloride, trichlorethane, and less desirably, tetrachlorethylene and carbontetrachl-oride, and with mixtures of the same with ketones, alcohols, ⁇ ethers, esters, etc. at low temperatures, for instance, below w20" C., that extracts are obtained of which small amounts suice to reduce the pour point of oils 10 to 20 or more degrees, without having any practically unfavorable influence on the viscosity index.
  • the amount of natural pour point reducer to be added is generally so small that a harmful iniiuence on the color of the oils treated therewith need not be feared. If necessary, the pour point reducer may be made lighter in color by chemical or physical rening, for instance, with fullers earth in benzine solution yor the like.
  • the natural pour point reducers may also beM obtained by first liberating the oil at low tem-iA perature with the aid of a non-selective solventy from the crystalline hard wax, whereupon the treatment with the selective agent is effected.
  • the natural pour point reducers produced acl.
  • cording to the process described above Imay be added to the oils to be dewaxed also prior to the chilling to low temperature or the removal of the wax, respectively, in order to obtain a better,v
  • naphtha, propane and similar light hydrocarbon oil fractions are not selective" solvents, as their temperature-solubility-curves for paraiflnic compounds do not essentially differ from their temperature-solubility-curves for non-parailnic compounds.
  • the following solvents may be mentioned as examples of selective solvents: chlorinated hydrocarbons, alcohols, ketones, aldehydes, esters and the like, separate or in mixtures, but of course the method is not restricted to the use of these solvents and mixtures.
  • a selective solvent is meant to include only those solvents whose temperature-solubility curve for parafiinic compounds differs so substantially from their temperature-solubility curve for nonfparainic compounds that they are relatively good solvents for the naphthenic and/or aromatic compounds and relatively poor solvents for the paraflinic compounds.
  • solvents those whose sole or main constituent is a chlorinated hydrocarbon, of which a number of ex amples are hereinbefore given, offer distinct advantages.

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  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
US248874A 1938-01-05 1938-12-31 Process for producing oils with low pour points Expired - Lifetime US2348459A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEA85390D DE741471C (de) 1938-01-05 1938-01-05 Verfahren zur Gewinnung tiefstockender OEle

Publications (1)

Publication Number Publication Date
US2348459A true US2348459A (en) 1944-05-09

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ID=6949463

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US248874A Expired - Lifetime US2348459A (en) 1938-01-05 1938-12-31 Process for producing oils with low pour points

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US (1) US2348459A (de)
DE (1) DE741471C (de)
FR (1) FR848457A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2654692A (en) * 1950-04-07 1953-10-06 Texaco Development Corp Solvent dewaxing

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE925310C (de) * 1951-02-27 1955-05-02 Bataafsche Petroleum Entparaffinieren von Mineraloelen mit selektiven Loesungsmitteln
DE954635C (de) * 1953-09-24 1956-12-20 Edeleanu Gmbh Verfahren zum Abtrennen von n-Paraffin aus Kohlenwasserstoffoelen
US5607035A (en) * 1994-10-13 1997-03-04 Delphi France Automotive Systems Hydraulic damper

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR748925A (fr) * 1931-11-23 1933-07-13 Standard Oil Co Perfectionnements aux procédés pour le traitement des huiles minérales
US2049046A (en) * 1932-05-09 1936-07-28 Union Oil Co Method of separating asphalt and wax from oil
US2045567A (en) * 1934-02-27 1936-06-30 Union Oil Co Process for separation of hard wax from soft wax associated therewith
FR790853A (fr) * 1934-07-14 1935-11-28 Standard Oil Dev Co Procédé de déparaffinage des huiles par centrifugation, à l'aide de solvants lourds
FR796385A (fr) * 1934-11-03 1936-04-06 Sharpes Specialty Company Perfectionnements aux procédés et aux appareils pour la séparation par centrifugation
FR801583A (fr) * 1935-02-13 1936-08-07 Sharples Specialty Co Perfectionnements au déparaffinage des huiles
FR811562A (fr) * 1935-10-03 1937-04-17 Bataafsche Petroleum Procédé pour préparer, en partant de mélanges d'hydrocarbures, des fractions ayant un point de fusion inférieur à celui de la cire de paraffine, par refroidissement et séparation à l'état solide

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2654692A (en) * 1950-04-07 1953-10-06 Texaco Development Corp Solvent dewaxing

Also Published As

Publication number Publication date
FR848457A (fr) 1939-10-31
DE741471C (de) 1943-11-11

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