SU1214746A1 - Method of refining sulphur-containing natural oils - Google Patents

Description

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FIELD OF THE INVENTION The invention relates to oil and fat and relates to the purification of oils.

The goal is to simplify the process by simultaneously removing sulfur-containing substances in the bleaching process. The temperature range of the proposed method is determined by the fact that at temperatures below 80 ° C, the rate of interaction of the basic carbonates of these metals with sulfur-containing rapeseed compounds is so low that it does not allow to prolong the purification under actual process conditions, at such temperatures undesirable processes such as oxidation and polymerization of oil.

The amount of basic carbonate is chosen from the consideration of the need for a twofold molar excess of metal (mainly carbonate) with respect to sulfur (in oil). Since the sulfur content in the oil fluctuates as the rules are from 0.001 to 0.02%, taking into account the mass fraction of the metal in the main carbonate, the proposed consumption limits for the main carbonate are chosen from 0.01 to 0.2% by weight of the oil.

Example. 500 g of hydrated and neutralized rapeseed oil with a total sulfur content of 10 mg / kg was heated to 60 ° C. At this temperature, to the oil with vigorous stirring, May 1 .7 (5 g) of bleaching clay (ascanite) is added, after which the temperature is raised to 80 ° C and, without stopping stirring, 0.01 wt.% (0.05 g a) basic copper carbonate.

After 20 minutes of mixing, bleached clay, basic copper carbonate and products of its interaction with sulfur-containing compounds are separated by filtration through a paper filter. In the thus-purified oil, sulfur-containing substances were absent.

Data on experimental verification of the proposed method are summarized in table. one.

As can be seen from the data given in table. 1, the refining of sulfur-containing vegetable oil on the offer

o

s

0

five

0

five

0

This method, within the limits of reagent consumption and temperature conditions, allows to obtain oils with the absence of sulfur-containing components.

The effectiveness of the applied method of refining was evaluated by. refractive indices of oil samples before and after hydrogenation, and expressed as the degree of reduction of unsaturated oil.

The results of the hydrogenation of rapeseed oil samples are presented in Table. 2

The data table. 2 indicate that the refining of sulfur-containing vegetable oil by the proposed method allows it to be prepared for hydrogenation no less efficiently than by a known method.

The effectiveness of the oil treatment stage with basic metal carbonates follows from the comparison of examples 1, 2 and 4, 5 in table. 2

 It should be noted that the purification of sulfur-containing vegetable oil from sulfur-containing compounds in the process of refining by the proposed method does not require additional equipment and can be combined with the stage of removal of pigments by adsorbents (when bleaching oil), and eliminates the stage of deodorization.

The use of specific metals when cleaning is reflected in the table. 3

As can be seen from the data given in table. 3, the refinement of the proposed method using basic carbonates of copper, zinc, iron, manganese, nickel almost completely removes sulfur-containing compounds (sulfide sulfur) from oils when processing the raw material in the range of 80-140 ° C and the specific consumption of carbonates from 0, 01 to 0.20%.

The results of experiments on the refining of mustard oil by the proposed method are given in table. four.

The proposed method is applicable for the refining of all sulfur-containing vegetable oils: rapeseed, mustard, and exotic.

Basic copper carbonate

Also

Basic zinc carbonate

Basic nickel carbonate

The main iron carbonate (P)

Basic manganese carbonate (P)

A mixture of basic nickel and copper carbonates

0.01

0.10

0.20

0,005

0.25

0.15 0.10 0.05 0.03

0.02

Partial polymerization and oxidation of the oil is observed.

table 2

Highly manual oil, 0.2% nickel

Hydration, neutralization, bleaching

The same and additional processing of 0.05% basic copper carbonate at 120 s at the bleaching stage (proposed method)

Hydration, neutralization, bleaching, deodorization (lime process)

10 34 34 10 34

34 34 10 10

ten

Oh oh

Ltd

about

23-25

39-40

39-40

Low hand oil, 0.1% nickel

Hydration, neutralization, bleaching

The same and additional processing of a 0.02% mixture of nickel and copper carbonates at 120 ° C at the bleaching stage (proposed method)

Hydration, neutralization, bleaching, deodorization (known method)

Copper

Oh, of

Continuation of table 2

23-25

36-40

36-40

Table 3

ten

Not detected

Also

Not detected

one

Not detected

Also

Not detected

Also

Not detected

1 10% 1 mg / kg

In these experiments, partial polymerization and oxidation of the oil was observed (an increase in the refractive index of the oil after the treatment).

Continuing tpbl. 3

During the experiment, the oil oxidized.

Compiled by E. Vudantsev Editor I. Segl nick Tehred S. Migunova Proofreader A. Zimokoson

Order 857/38

Circulation 392

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Fipial ShSh Patent, Uzhgoood, ul. Project, 4

Table 4

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Claims (1)

METHOD FOR REFINING SURFACE-CONTAINING VEGETABLE OILS, including hydration, neutralization, bleaching with an adsorbent with stirring and removal of sulfur-containing substances, characterized in that, in order to simplify the process by combining the bleaching and removal of sulfur-containing substances, the oil is heated to 80-140 ° after the adsorbent is introduced into the oil C, after reaching which 0.01-0.20% of the mass of the mixture of basic metal carbonate selected from the series is introduced into a mixture of oil with an adsorbent: copper, zinc, manganese, iron, nickel. ί