RU2244009C1 - Method for preparing diffusion juice - Google Patents

Abstract

FIELD: SUGAR INDUSTRY.

SUBSTANCE: invention relates to methods for preparing the sugar beet diffusion juice. Method involves mixing aluminum-containing reagent of bentonite clay with water and treatment of the mixture in a diaphragm electrolyzer up to pH value of anolyte 3.2-3.8 and that of catholyte up to 6.0-6.5. Before extraction beet chips are treated with anolyte and extraction of sucrose from beet chips in diffusion apparatus is carried out at temperature 62-68^o C with removal of diffusion juice. Method provides enhancing purity of diffusion juice by 0.5-1.5% and elevating yield of sugar by 0.42-0.55% as compared with the known method.

EFFECT: improved preparing method.

3 tbl, 1 ex

Description

The invention relates to the sugar industry, and in particular to methods for producing diffusion juice from sugar beets.

A known method of producing diffusion juice, comprising dissolving salt in water in an amount of 0.03-0.05% by weight of beets, processing the resulting solution in a diaphragm electrolyzer with a catholyte tap with a pH of 4.5-5.5 and extracting sucrose from beet chips by this catholyte with a drainage of diffusion juice (RU 2035515 C1, C 13 D 1/08, 05.20.95, Bull. No. 14).

The disadvantages of this method of obtaining diffusion juice:

- a low increase in the purity of diffusion juice;

- to ensure a sufficient disinfecting effect, the extraction must be carried out at an elevated temperature (up to 70 ° C), as well as scalding the chips, which leads to an increase in energy consumption.

The technical result of the invention is to improve the quality of diffusion juice, namely increasing its purity.

The technical result is achieved by the fact that in the proposed method for producing diffusion juice, which involves mixing an aluminum-containing reagent with water, processing the mixture in a diaphragm electrolyzer with anolyte and catholyte drain and extracting sucrose from beet chips with catholyte with a diffusion juice outlet, it is new that as an aluminum-containing reagent is used bentonite clay and the processing process in the electrolyzer is carried out until the pH of the anolyte reaches 3.2-3.8, and catholyte - 6.0-6.5 and the extraction At a temperature of 62-68 ° C, the beet chips are treated with anolyte before extraction.

The method is as follows. The beets are washed, chopped into chips and sprayed with anolyte with a pH of 3.2-3.8 in an amount of 10-20 dm ³ per 1 ton of beet. Anolyte is obtained by treating a mixture of bentonite clay with water in the anode chamber of a diaphragm electrolyzer. The consumption of bentonite clay is 0.2-0.4 g per 1 dm ^{3 of the} mixture.

The introduction of the anolyte thus obtained inhibits the cellular respiration of beetroot mass and inhibits the activity of concomitant microflora. The effectiveness of this effect is such that it can dispense with the scalding operation of the chips and carry out extraction at a lower temperature of 62-68 ° C. Anolyte with such parameters can be prepared on any serial domestic membrane electroactivators of the STEL-10 AK type, which have the corresponding certificates of the Sanitary and Epidemiological Service of the Russian Federation.

Anolyte treated beet chips are subjected to extraction. The extractant is prepared as follows. Bentonite clay is mixed with water (its consumption is 0.2-0.4 g per 1 dm ^{3 of the} mixture). The resulting mixture is treated in the cathode chamber of a diaphragm electrolyzer to a pH of 6.0-6.5. In this case, catholyte is obtained, which is used as an extractant. The extraction is carried out at a temperature of 62-68 ° C.

The catholyte used in the proposed method as an extractant has a high extracting ability for sucrose. The aluminosilicates that make up the bentonite clay form insoluble compounds with beet cell protopectin, preventing the cell wall components from passing into the diffusion juice, which reduce its purity. That is, the catholyte acts on the membrane of the beet cell in such a way that it increases its permeability for sucrose and reduces for non-sugars, and therefore the purity of diffusion juice increases by 0.5-1.5% compared to the known method.

Example. Since the quality of diffusion juice depends on the composition of sugar beets, studies were carried out on beets of the same quality under comparable conditions. The purity of the cell juice was 83.00%. The beets are washed and chopped and sprayed with anolyte with a pH of 3.5, obtained by treating a mixture of bentonite clay with water (consumption of bentonite clay was 0.28 g per 1 dm ^{3 of} mixture) in the anode chamber of the diaphragm electrolyzer. Chips sprinkled with anolyte are fed into the extractor. The extractant used is a catholyte with a pH of 6.2, obtained from the same mixture of bentonite clay by treating it in the cathode chamber of a diaphragm electrolyzer. The extraction process is carried out at a temperature of 65 ° C. The purity of the diffusion juice obtained by the proposed method is 87.67%.

In parallel, the process is carried out by a known method. The beets are washed, crushed into chips, scalded and sent to an extractor, to which an extractant — catholyte with a pH of 5.0, obtained from a solution of aluminum sulfate with a concentration of 0.04% by weight of beets — is fed. The extraction process is carried out at a temperature of 70 ° C. The purity of the diffusion juice obtained by the known method is 86.37%.

From the above example it is seen that the purity of the diffusion juice obtained by the proposed method is 1.3% higher than the purity of the diffusion juice obtained by the known method.

In the table. 1 shows the purity of diffusion juice obtained by known and proposed methods. Upon receipt of diffusion juice by the proposed method, a different extraction temperature is set, and the pH of the catholyte is 6.2. From the data given in table. 1, it follows that when using catholyte prepared from a mixture of bentonite clay with water for the extraction process by processing in the cathode chamber of a diaphragm electrolyzer, and at the temperature of the extraction process 62-68 ° C, the greatest increase in the purity of diffusion juice relative to the known method is observed. The catholyte obtained from a solution of aluminum sulfate by treatment in the cathode chamber of a diaphragm electrolyzer as an extractant has less efficiency.

In the table. 2 shows the purity of diffusion juice obtained by the known and proposed methods, depending on the pH of the extractant. Extraction according to the known method is carried out at a temperature of 70 ° C using catholyte obtained from a solution of aluminum sulfate by treatment in a cathode chamber of a diaphragm electrolyzer, and according to the proposed method - at a temperature of 65 ° C using catholyte obtained from a mixture of bentonite clay with water by treatment in a cathode the chamber of the diaphragm electrolyzer. From the table. 2 shows that the purity of the diffusion juice obtained by the known method is 0.5-1.5% less than the purity of the juice obtained by the proposed method. Going beyond the pH values of catholyte specified in the formula leads to a sharp deterioration in the quality of diffusion juice.

In the table. 3 shows the technological indicators of diffusion juices obtained by the known and proposed methods, as well as juices II saturation. The data confirm that the juice of the second saturation obtained using the proposed method has better performance in comparison with the juice of the second saturation II obtained using the known method: the purity of the juice is higher by 1.21%, the color is lower by 0.86 conv. units

Implementation of the proposed method in a production environment will increase the yield of sugar by 0.42-0.55% compared with the known technical solution.

Table 1 The temperature of extraction, ° C H% ΔH,% Known method 70 86.37 - The proposed method 58 86.41 +0.04 62 86.95 +0.58 65 87.67 +1.30 68 87.60 +1.23 70 86.43 +0.06 table 2 extractant pH The purity of diffusion juice,% known method the proposed method 5,0 86.22 86.20 5.5 86.20 86.23 6.0 - 86.50 6.2 - 87.70 6.5 - 87.23 7.0 - 86.35 Table 3 Kind of juice H% ΔH,% Tsv, conv. units The content of colloids,% by weight of juice Diffusion juice obtained by the method: famous 86.44 - - 0.274 proposed 87.74 +1.30 - 0,200 Saturation juice II obtained using the method: famous 91.22 - 5.12 0.145 proposed 92.43 +1.21 4.26 0.114

Claims (1)

A method for producing diffusion juice, which involves mixing an aluminum-containing reagent with water, processing the mixture in a diaphragm electrolyzer with anolyte and catholyte drain, and extracting sucrose from beet chips with catholyte with a diffusion juice outlet, characterized in that bentonite clay is used as an aluminum-containing reagent, the electrolysis process carried out until the pH of the anolyte reaches 3.2-3.8, and catholyte - 6.0-6.5 and the extraction is carried out at a temperature of 62-68 ° C, with beet chips before traction treated with anolyte.