DE1940262A1 - Process for refining edible oil - Google Patents

Description

UR. MDLLtR-BORi DIPt .-! NG. GRALFS 0IPL-FHyS-DR-MANlTZDlPL-CHEM-DlLDEUFEL 1940262

PATENT LAWYERS

-7. From 4BSI

Lo / Sh - E 1004

Extraction de Srnet Prins Boudewijnlaan 265 «Edegem, Belgium

Process for refining edible oil Priority: Luxembourg v. August 8, 1968

No. 56 683

The invention relates to a method of refining Edible oil in which crude oil bit a »neutralizing agent mixed with a solvent and then the mixture obtained is allowed to settle «-

It is known to neutralize edible oil by adding a neutralization agent to the crude oil, for example sodium hydroxide (caustic soda). The soaps obtained by combining the fatty acids and the neutralization agent retain a certain amount of neutral oil 1st difficult to separate read neutral oil from the soap _t if you own the NeutraliBationsmlttel the crude oil SU-mlecht. This working level therefore gives an average or even poor yield.

Likewise, it is already known «the neutralization agent, for example sodium hydroxide, not the crude oil but a Hohmiscella, d. H. that in a solvent, e.g. B.

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BATH ORIGINAL

dissolved raw ^ oil, add, Wean to adding the neutralizing agent of raw Mi se el la, it is still impossible, the soaps obtained by linking the fatty acids and the neutralizing agent from the neutral mixture ά .. h. • the solvent containing neutralized oil, %. B. hexane, separated by a simple clarification process. Therefore, the separation of the soaps from the neutralized miscella must be effected by centrifuges. The necessary arrangements for carrying out this procedure are consequently rather complicated. The separation remains incomplete and a certain percentage of neutral oil is carried along by the soap in the form of the milk

In another known procedure, the crude oil is the solution of crude oil in a solvent, with the neutralizing agent and a third solvent, ie a liquid which is partially soluble in the solvent of the cellular cell and in the neutralizing agent, mixed, then the mixture thus obtained is allowed to settle. For example, hexane is used as an intermediate solvent in the blend composition; Sodium hydroxide can be used as a neutralizing agent and a third solvent istIsopropylalkohol particularly suitable · This work W as allows the treatment of mixtures of very different concentrations with increased Auebeute of oil. It justifies the use of the steam required to recover the solvents used if the oil to be treated has a fairly high degree of acidity. However, this mode of operation is less economical when the oil to be treated is relatively weakly acidic.

The method according to the invention allows a particularly economical refining of slightly acidic edible oil.

To do this, first mix crude oil and from 0 to 50 % of the solvent with the neutralizing agent, and

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the mixture obtained in this way 100 to 50 % dee solvent β see below.

Hence, the raw oil kit can be used as a fertilizer mix and add the total amount of solvent to this mixture «. In the same way, neutralizing agents can be mixed with a mixture kit concentrated in oil and the solvents required for supplementation can be added to this mixture.

In a particular embodiment of the invention, heated nan the mixture of raw oil, 0 to 500 solvents and Neutralizing agent before adding the solvent required or supplemented.

In another particular embodiment of the invention heated for about 2 to 3 minutes.

In a preferred embodiment of the invention, it washes the upper phase formed by settling

In a further, very advantageous embodiment of the Invention is the lower bladder, which forms itself through subsidence acidified,

Further details and peculiarities of Irfindtaas result from the following beach description, in much of the example the haffination of spittoon oil under Bengmatee on the Zeidtaasag I am inclined to accept the Brfindua «st n» s »hrl« Ven.

The drawing is a diagram of the implementation of the procedure on the basis of the ination of cooking oil with the Iff charge.

The crude oil is in the mixer 1 by means of 4 pipe 2, in which a flow meter 3 is installed, sugefeits. Oils Line 4-, in which a flow meter 5 is switched is, the neutralizing agent leads into the mixer 1. The

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An example of a neutralizing agent is sodium hydroxide. The amount of RatrixifflhydroxyA which is added depends on the acidity of the mixture and can be determined by titration; it should be sufficient to neutralize the oil. ,, However, it is advisable to use an excess of about 10 % . The concentration of the caustic soda can vary within very large limits. Sodium hydroxide solution with a concentration of 20 ⁰ Be (15%) is perfectly suitable.

For example, 0.75 l of sodium hydroxide solution with a concentration of 20 ° Be (15 %) is added to 20 kg of oil with an acidity of 4 %. The formed in the mixer 1 temperature of the mixture depends on the temperature of W apparently introduced into the mixer crude oil and that of the introduced sodium hydroxide solution and is equally determined by the occurring in the mixer neutralization reaction. This temperature is generally of the order of magnitude of MO ⁰ G. The mixture formed in the mixer 1 is passed through the line 6 to the mixer 7 heated to a temperature of the order of 80 ^{° O.} The heating is carried out quickly, the passage time of the liquid through the heater is la of the order of magnitude of 2 to 3 "in. : '.-

. In the mixer 7, the mixture originating from the mixer 1 is "mixed with the soldering agent, i.e. hexane, which through the line 9 carrying a flow meter 10 is introduced «, The amount of hexas added can be within very large limits vary. For example, adds »to 5 liters of hexane to 1 liter of treated Oil too. The liquid emerging from the mixer 7 is therefore a mixture of hexane and caustic soda in the mixer 1 neutralizes the oil, d. n. eim © mixture, which already contains neutralized oil.

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In contrast to the way of working, in which nan the neutralizing agent to which the crude oil containing hexane is added, separates the mixture granulating aua the mixer 7 as a result of gravity into a neutral Hieeella, d. H. Heawa. and neutral oil, containing upper phase and one which is obtained by neutralization Soap made of crude oil fatty acids doing lower Phase. This separation is in a continuous Ahsatsba container 12 carried out, which through line 11 old aue the mixer 7 exiting mixture is supplied. ^

The neutralized Hlecelltt which forms the upper phase is turned off the upper part of the Abeet "container" 12 Via line 13 see below a wash column 14 out. The neutral miscelle is in this column. washed old fresh water in the counterstroa, which is introduced via line 15. The water will fed into the upper bearing of the column and through the old the lower part of the column 14 connected line 16. as Soapy water removed. The biaotle passed through line 13 into the lower part of column 14. is considered neutral Mixing via the one connected to the upper rope of the column 14 Line 1? deducted. The Kolonne14 can according to the described in French patent specification 1,289,856 Form. * »

In the column 14, fresh water introduced through the line 15 takes with it the traces of soap which were brought in by the miscellaneous _ω emerging from the settling tank 12 via the line 13.

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oo The soap is poured out of the lower part of the sedimentation tank 12,

^ to which the line 18 is connected, this remote

^ Soap is then traditionally

NJ acts. For example, »it is acidified with sulphurous acid

w or in la der fraaeöeleoaeii Pfttentichrlft 1 071 291

or in the German patent "cfcr £ ft 961 360 b" eö2irebenen device treated _t alt de "goal, dte" la

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pulled soap to recover contaminating neutral oil and then acidifying this soap to make concentrated fatty acids. The fact that the French Patent specification 1 071 291 only applies to the one from the Abeat container The third solvent is nutritious can only be added to the amount of soap and therefore it is not necessary to watch the alcohol in the total amount of oil,. which is a great advantage if the raw oil is weak is angry. The amount of alcohol to be evaporated is therefore very large much lower and the steam consumption reduced accordingly «

In another embodiment of the method described above one leads into the mixer 1 by means of the line 2 concentrated miscella. This miscella contains belspielswois3 11 oil to 2.5 liters of hexane.

This other implementation of the procedure corresponds to further course of the procedure described above, depending on but it should be pointed out that it is sufficient via the line 9 in the mixer 7 the hexane required sur supplement add, for example 2.5 l to 11 oil, d. H. to 3.5 1; Miscelle was introduced into mixer 1 via line 2. That - Process can therefore both starting from crude oil as well "To be carried out by concentrated raw miecella. Important Is that part of the solvent through line 9 in the mixer 7 is introduced after the crude oil or the concentrated, raw miso # 1la already with the ffeutrallsationsmittel has reacted »

Ea should also be noted that in the description the term "edible oils" used in the process according to the invention vegetable and animal fatty substances in general.

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Claims (1)

Fate η tans ρ ν te he 1. Method but refining you edible oil by boiling crude oil with a neutralizing agent and a solvent and allowing the mixture thus obtained to settle, thereby g © k © & η ζ © i © h η β t that you first-.rohes' oil and Mix 50 % of the solution with the neutralizing agent and add 100 to 1% of the refining agent to the resulting mixture. 2. The method according to claim i _t thereby k β η η s β i η © t, that mm ai® mixture of "'crude oil" 0 to ^ O % W- imä. Samtealisatioaemitt®! before adding the Gasification © 2> f © ^ d © 3Plietoa solvents © rwärota - A method Saoli claim 2, characterized g β k © η m β ι ei h net, DAB "erhitst to the Hlsohusg to a temperature in the feoBenordaung VOA 70 to 80 ⁰ C. Terfahrea after a® »- the aspiration 2 or 3 _S ärdm ^ ch. ge ken & £ 9 i have to pay attention to the fact that the srhitstmgi is carried out very well. after Asf ^ msli ^, £ afts »e £ if # k ^ m & ® .1 ο 2i« t β that one \ m $ * £ & hx 2 to 3 nia «raitst» S. T ^^ drive naeli alia®® € ^ T®rherg®ke®ä, en A & sprüch © _s .by * g ® ke η η ε eic h, u ausiAsoht. ?. Method according to Claim 6, characterized net, that the washing is carried out with fresh water in countercurrent. 8. Method according to one of the preceding claims, characterized in that characterized by acidifying the lower phase formed by settling * «. · 7'- -. '■ 909887/1238. teeieite