SU1640148A1 - Refining of sulfur containing vegetable oils - Google Patents

Abstract

The invention relates to the oil industry and can be used in the refining of sulfur-containing vegetable oils. The goal is to improve the quality and reduce losses in the process of refining the oils, which is achieved due to the fact that neutralization is carried out in 50% miscella, and bleaching and removal of sulfur-containing substances is carried out after separation of the stockpile by processing neutralized miscella thionite brand KU-2 in the H-form, which is taken in the amount of 4-5% by weight of the oil. 3 tab.

Description

The invention relates to the oil and fat industry and can be used in the refining of sulfur-containing vegetable oils.

The aim of the invention is to improve the quality and reduce losses in the process of refining oils.

The method is applicable to the refining of sulfur-containing vegetable oils - rapeseed, mustard, camelina and is carried out as follows.

After hydration, the vegetable oils in the form of a 50% miscella are neutralized with stirring with an alkali solution of NaOH (an alkali concentration of 140 g / l with an excess of it against the theoretically required 40%) at L5-60 ° C for 30 minutes with stirring. The reaction mixture is then allowed to settle for 60 minutes and the mixture is separated, while the temperature of the mixture drops to 45-50 ° C.

i

Count what to remove traces of soap

Neutralized miscella is treated with sulfur-containing compounds with KU-2 cation exchanger in the H-form, which is taken in an amount of 4-5% by weight of the oil.

Before using for processing the neutralized miscella, the cationite is activated with concentrated hydrochloric acid at the rate of 10 ml of acid per 1 g of cation exchanger. Activation is carried out for. 1-0 min. After which the acid is drained, the 5 cation resin is washed with distilled water until the acid is completely removed and dried.

The results of studying the effect of miscella concentration on the quality indicators of refined rapeseed oil are given in Table 1 (neutralization is carried out for 30 minutes at

about

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ABOUT

316

55-60 ° C with alkali NaOH with a concentration of 140 g / l with an excess of alkali 40%),

Analysis of the data in Table 1 shows that with an increase in the concentration of miscella up to 50%, the acid number and color of the refined oil decrease. With a further increase in miscella concentration, an increase in the acid number and color of the oil is observed. The yield of refined oil decreases with increasing concentration of miscella. When the concentration of miscella is 50%, a refined oil is obtained that meets the requirements of GOST (acid number 0.4 mg KOH, color number Sr30 mg 1) The yield of oil according to the proposed method (at 50% miscella concentration) is 94.2% against 91 , 4% by a known method.

The results of studying the effect of cathinite concentration on the quality of refined rapeseed oil are shown in Table 2.

At the same time, as an adsorbent, sulfacationites of the grades KU-1, KU-2, KU-5 and KFUR-1 can be used in the H-form. However, among the series of these cation exchangers, the cation exchanger KU-2 has the highest exchange capacity for Na and S ions, which is recommended for the purification of sulfur-containing vegetable oils.

From Table 2 it can be seen that to completely remove soap and sulfur-containing compounds, it is necessary to use cation exchanger in an amount of 4-5%, a further increase in the amount of cation exchanger is not economically feasible. In this case, the removal of soap and sulfur-containing compounds follows the following scheme:

RCOONa + HR

RCOOH + R Na

RNCS + HR-R-NH-C-R

II

i s

where is cation exchanger in Ntform; RCOONa - sodium salt of fatty acids,

48 4

In addition, the implementation of the neutralization of oils in miscella allows for an increase in the yield of refined oil by reducing the viscosity of the oil and reducing the fat content of the juice.

Comparative data of soap stock produced by neutralizing the oil according to the known and proposed methods is given in table 3.

From Table 3 it can be seen that when refining rapeseed oil according to the proposed method, the total fat content in the soap stock is 46.3% versus 50.7% of the total fat in the stock flow when the oil is refined by a known method, i.e., the yield of refined oil increases.

Thus, when refining sulfur-containing oils in accordance with the proposed method, the quality of the oils improves in terms of color, acid number and residual content of traces of soap and sulfur in the oil, moreover, the loss of oil in soap stock is reduced by about 2-3%.

Claims (1)

Invention Formula A method of refining sulfur-containing vegetable oils, including hydration, neutralization, bleaching with an adsorbent under agitation and removal of sulfur-containing substances, characterized in that, in order to improve the quality and reduce losses in the process of refining oils, hydration and neutralization are carried out in 50% miscella, and bleaching and removal of sulfur-containing substances are carried out simultaneously, and the cation exchanger KU-2 in the H-form is used as the adsorbent, which is taken in an amount of 4-5% by weight of the oil. 16401486 Table 1 Concentration - Acidic Chromaticity, Yield of refined mis- number, - mg of 12 foot oil,% cella,% mg KOH The proposed method 30 0.51 40 .97.1 40 0.38 3595.7 50 0.24 2594.2 60 0.27 3593.8 80 0.29 4092.3 Known method 100 0.31 4091.4 Table 2 Quality indicators The values of indicators for the amount of cation exchanger,% of refined oil are rm-tm.  „° ° L2 ° J. 1 Acid number, mg KOH 0,22 0,25 0,27 0,290,300,30 Soap content (quality test) Traces Traces Traces Traces No-Sulfur content, mg / kg 9.3 7.5 5.0 2.1 OO - -Table3 Indicators Values of stock indicators during refining oils Stny method) (the proposed method) Neutral fat% 22.1 17.9 Fatty acids,% 28.6 28.4 Total fat,% 50.7 46.3 Compiled by Yu.Skorbov Editor N.Gunko Tekhred L.Oliynyk Proofreader I.Erdeyi Order 996 Circulation 289Subscription VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab 4/5 Production and publishing plant Patent, Uzhgorod, st. Gagarin, 101