EP0041002B1 - Procédé de traitement des huiles végétales pour l'amélioration de leur stabilité à froid - Google Patents

Procédé de traitement des huiles végétales pour l'amélioration de leur stabilité à froid Download PDF

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Publication number
EP0041002B1
EP0041002B1 EP81400750A EP81400750A EP0041002B1 EP 0041002 B1 EP0041002 B1 EP 0041002B1 EP 81400750 A EP81400750 A EP 81400750A EP 81400750 A EP81400750 A EP 81400750A EP 0041002 B1 EP0041002 B1 EP 0041002B1
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EP
European Patent Office
Prior art keywords
oil
process according
treatment
container
ppm
Prior art date
Legal status (The legal status 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 status listed.)
Expired
Application number
EP81400750A
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German (de)
English (en)
French (fr)
Other versions
EP0041002A3 (en
EP0041002A2 (fr
Inventor
François Zwobada
Albert Lacome
Jean Maris Klein
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Lesieur Cotelle et Associes SA
Original Assignee
Lesieur Cotelle et Associes SA
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.)
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Publication date
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Priority to AT81400750T priority Critical patent/ATE7306T1/de
Publication of EP0041002A2 publication Critical patent/EP0041002A2/fr
Publication of EP0041002A3 publication Critical patent/EP0041002A3/fr
Application granted granted Critical
Publication of EP0041002B1 publication Critical patent/EP0041002B1/fr
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11B—PRODUCING, e.g. BY PRESSING RAW MATERIALS OR BY EXTRACTION FROM WASTE MATERIALS, REFINING OR PRESERVING FATS, FATTY SUBSTANCES, e.g. LANOLIN, FATTY OILS OR WAXES; ESSENTIAL OILS; PERFUMES
    • C11B7/00—Separation of mixtures of fats or fatty oils into their constituents, e.g. saturated oils from unsaturated oils
    • C11B7/0075—Separation of mixtures of fats or fatty oils into their constituents, e.g. saturated oils from unsaturated oils by differences of melting or solidifying points

Definitions

  • the subject of the present invention is a process for treating vegetable oils for improving their cold stability. This process makes it possible to clarify (for example by dewaxing, wintering) oils and in particular edible oils, such as for example, sunflower oil, corn oil, or peanut oil.
  • the oil is cooled for a few hours to an appropriate temperature, making it possible to obtain crystals which can be separated by filtration.
  • a filter aid e.g. filter earth.
  • the second method mentioned requires the use of a large quantity of wetting agent solution (5 to 10%) and the use of an expensive separation material and requiring high maintenance costs.
  • the object of the present invention is to overcome these drawbacks by proposing a process making it possible to obtain clear oils even from oils having high levels of constituents with a high melting point (waxes, partial glycerides, etc.). without the use of filter earth or centrifugation.
  • This process is characterized in that, after cooling the oil to be treated to a temperature chosen so as to allow the crystallization of the compounds to be eliminated, at least part of this oil is subjected to a neutral gas pressure of 4 to 10 bars and then an expansion at atmospheric pressure so as to create fine gas bubbles which are fixed on the crystallized compounds so as to produce a foam with a density lower than that of the oil constituted by a crystal-bubble gas complex which rises to the surface of the container, thus making it possible to obtain at the lower part of the latter, after decantation, a clarified oil having a content of less than 30 ppm of crystals and with a yield greater than 90%.
  • the performance of such a process essentially depends on the formation of crystals of an appropriate size, a sufficient quantity of fine gas bubbles, in the liquid, and on the adhesion of the bubbles to the solid particles.
  • gas bubbles whose quantity and diameter are such that they promote the quantitative formation of a bubble-crystal complex with a density lower than that of the oil.
  • a small amount of clarification aid is added to the oil to be treated, making it possible to reduce the affinity of the crystals with respect to the oily phase.
  • the oil to be treated is a neutralized oil containing soaps, the latter fulfilling the function of clarifying adjuvants.
  • soaps the presence of water and surfactants (soaps) promotes the adhesion of waxes to air bubbles.
  • the gas-oil contact under pressure is carried out with stirring for a period of approximately 30 min.
  • the method comprises a step of reprocessing the waxes making it possible to recover the oils which are contained therein.
  • the oil to be treated is brought according to arrow A in a cooler 1 comprising an agitator 2.
  • the oil to be treated is brought to the appropriate temperature, chosen according to the type of oil to be treated .
  • the oil is then brought to a ripener 3 where it is kept at the same temperature so as to allow quantitative crystallization of the compounds to be removed, under conditions suitable according to the type of oil.
  • the oil is also subjected to agitation by means of an agitator 4.
  • the oil is brought along arrow D to the lower part of a decantation container 5 and, it is subjected to the action of fine bubbles of a neutral gas, which attach to the crystals to eliminate so as to produce a gas-crystal complex in the form of a foam with a density lower than that of oil.
  • This complex collects in zone 6 of the container, where it is removed by scraping according to arrow C.
  • the production of fine bubbles of neutral gas is obtained by taking a fraction E of clarified oil which is brought into a saturator 8, where it is subjected to the action of a neutral gas such as air or nitrogen arriving according to arrow F under a pressure of between 4 and 10 bar, before being expanded to atmospheric pressure, the duration of the gas-oil contact in the saturator 8 being approximately equal to 30 min.
  • a neutral gas such as air or nitrogen arriving according to arrow F under a pressure of between 4 and 10 bar
  • a clarified oil G is recovered, a fraction E of which is recycled to the saturator 8.
  • the flow rate of this fraction can range up to 300% of the flow rate of the oil to be treated leaving the ripener 3.
  • This oil enriched in waxes can be treated by the method according to the invention or by usual methods (decantation, centrifugation, filtration).
  • the starting raw material is a sunflower oil containing 800 ppm of waxes.
  • This oil which has been subjected beforehand to neutralization and contains 0.4% water and 1080 ppm of sodium hydroxide soap, it is introduced into a 5 liter beaker, equipped with an agitator, the whole placed in a refrigerated enclosure at 5 ° C for a period of approximately 10 hours with continuous stirring.
  • This oil is transferred to a 4 liter saturator equipped with an agitator.
  • the saturator is subjected to a pressure of 10 bars.
  • the contact time is 30 min. under continuous stirring, the oil temperature being maintained at 5 ° C by a coil located inside the reactor. At the end of this operation, the oil is expanded to atmospheric pressure by direct transfer to a 4-liter beaker. After one hour of decantation at + 5 ° C, a separation of two phases is obtained. At the bottom of the container, about 2,850 g of the dewaxed oil are recovered, which now contains only 20 ppm of waxes and 0.1% of water. At the top of the container, about 150 g of foam is recovered, consisting of a wax-fine gas bubble complex.
  • the dewaxed oil can either be subjected to the following stages of refining, or subjected to a new treatment cycle in order to perfect the dewaxing process.
  • the starting raw material is a sunflower oil containing 85 ppm of waxes. We take 3 kg of this oil previously neutralized and containing 0.3% water and 1400 ppm of sodium soap. By applying the method of Example 1, a dewaxed oil is obtained containing 7 ppm of waxes, 0.05% water and 52 ppm of soap. The dewaxed oil yield is 98.4
  • the starting oil is a neutralized and discolored sunflower oil, containing 700 ppm of waxes, less than 0.05% water and less than 2 ppm of sodium.
  • a dewaxed oil is obtained containing approximately 60 ppm of residual waxes with a yield greater than 93% of dewaxed oil.
  • the starting oil is a crude corn oil containing 150 ppm of waxes.
  • the procedure is as indicated in Example 1.
  • a dewaxed oil is obtained containing 50 ppm of residual waxes and from which the suspended materials such as mucilages, solid particles, etc. are at the same time partially removed.
  • the yield of dewaxed oil after clarification is therefore 95% and can range up to approximately 98.5%.
  • oils obtained in Examples 1 to 5 are subjected to conventional refining operations as the case may be, up to the stage before deodorization.
  • the samples thus obtained are stored at + 5 ° C for 24 hours or more.
  • An oil containing 1% of waxes from dewaxing foams obtained by the process according to the invention is cooled to 25-30 ° C overnight and then centrifuged.
  • the heavy phase containing the waxes represents 12% of the oil thus treated.
  • the light fraction represents approximately 88% partially dewaxed oil at 400 ppm of waxes, which can be recycled as a mixture with the oil to be treated.

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Fats And Perfumes (AREA)
EP81400750A 1980-05-22 1981-05-12 Procédé de traitement des huiles végétales pour l'amélioration de leur stabilité à froid Expired EP0041002B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81400750T ATE7306T1 (de) 1980-05-22 1981-05-12 Verfahren zur behandlung von pflanzenoelen zur verbesserung ihrer stabilitaet in der kaelte.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8011450A FR2482976A1 (fr) 1980-05-22 1980-05-22 Procede de traitement des huiles vegetales pour l'amelioration de leur stabilite a froid
FR8011450 1980-05-22

Publications (3)

Publication Number Publication Date
EP0041002A2 EP0041002A2 (fr) 1981-12-02
EP0041002A3 EP0041002A3 (en) 1981-12-09
EP0041002B1 true EP0041002B1 (fr) 1984-05-02

Family

ID=9242239

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81400750A Expired EP0041002B1 (fr) 1980-05-22 1981-05-12 Procédé de traitement des huiles végétales pour l'amélioration de leur stabilité à froid

Country Status (7)

Country Link
EP (1) EP0041002B1 (OSRAM)
AR (1) AR223283A1 (OSRAM)
AT (1) ATE7306T1 (OSRAM)
CA (1) CA1160643A (OSRAM)
DE (1) DE3163364D1 (OSRAM)
ES (1) ES502324A0 (OSRAM)
FR (1) FR2482976A1 (OSRAM)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2683225B1 (fr) * 1991-10-31 1993-12-31 Gattefosse Sa Procede pour ameliorer une huile glycerolysee.
US10349941B2 (en) 2015-05-27 2019-07-16 Covidien Lp Multi-fire lead screw stapling device

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB962814A (en) * 1959-10-12 1964-07-01 Procter & Gamble Ltd Winterizing hardened soyabean oils
GB1120456A (en) * 1964-12-14 1968-07-17 Ranchers Cotton Oil Method of separating components of oleaginous mixtures by fractional crystallization

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Guide de la séparation liquide-solide (P.Rivet), pub. 1981 ed. IDEXPO, Cachan, France Perry's Chemical Engineers' Handbook, 5e ed., McGraw-Hill Book Co. 1973 *

Also Published As

Publication number Publication date
ATE7306T1 (de) 1984-05-15
EP0041002A3 (en) 1981-12-09
ES8206617A1 (es) 1982-08-16
FR2482976B1 (OSRAM) 1985-03-22
DE3163364D1 (en) 1984-06-07
FR2482976A1 (fr) 1981-11-27
CA1160643A (fr) 1984-01-17
AR223283A1 (es) 1981-07-31
ES502324A0 (es) 1982-08-16
EP0041002A2 (fr) 1981-12-02

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