SU552361A1 - The method of cleaning the swelling of the sugar industry - Google Patents

Description

The invention relates to a method for cleaning sugar production edema using ion exchange materials and alkaline earth metal compounds, followed by saturation. A known method of cleaning low-quality edemas of sugar production (for example, green molasses, molasses), which provides for the elimination of edemas, i.e. treatment with lime and carbon dioxide. The calcium carbonate formed during such processing has the ability to adsorb non-sugars anions from solution, which are replaced by an equivalent amount of avionic CO. The cleaning effect is due to the fact that the anion mass is equivalent to CO | less than the equivalent mass of adsorbed organic anions. However, this does not have a sufficiently high purification effect, due only to an equivalent exchange of anions, and the K + and Na + cations remain as part of the non-sugars, due to their high molasses-forming ability. In order to increase the cleaning effect during de-cosification treatment of edemas and reduce the loss of sugar in molasses, before odeco-saturation, the effluent is subjected to ion-exchange treatment, as a result of which the ions present in the depletion (mainly K + and Na + ions) are replaced partially with ions of polyvalent metals (or Mg2 +). Direct replacement of K + and Na + ions with ions or M.g2 + can be achieved by passing the effluent (according to Quentin's method) through a cation exchanger in the appropriate form. In the subsequent depaturization purification, the equivalent replacement of the anions of the solution due to adsorption on calcium carbonate to the anion CO–– results in the formation of carbonates or Mg2 +. The latter, due to low solubility, are precipitated from the solution, thus contributing to additional adsorption purification. Therefore, in this case, the effect of purification is due not only to the equivalent exchange of anions, but also to the removal from the solution of the amount of cations equivalent to the adsorbed anions. An additional source of sugar loss in molasses is the lower molasses-forming ability of the calcium or magnesium salts remaining in the purified solution, and this effect can be regulated by the degree of K + and Na + ions exchange on or. The increase in the purity of the effluent during the combined ion-exchange and de-cosification treatment increases if Ca- or Mg-cation is preceded

anion exchange using anion exchange resin in S04 form.

The proposed method is carried out as follows.

The blend obtained after the fuffing is heated or diluted to get rid of crystalline flour and passed through ion exchangers in the appropriate form. It is then subjected to a defocused purification at 70-80 ° C, after which it is filtered, boiled and crystallized in the usual way.

Example I. 500 ml of a green molasses solution is passed through 400 ml of KU-2 cation exchanger in the Ca-form, after which de-cosaturation is carried out with a consumption of lime 10% by weight of the dry matter of the solution to a pH of 8.5-9.0. A parallel sample is subjected to defaturation cleaning with the same amount of lime without first passing through ion exchanger.

The results are shown in Table. one.

Table 1

The number of non-sugars removed during the defaturation purification of the syrup passed through the Ca-cation exchanger is 1.8 times greater than during the purification of the original syrup.

Example 2. A solution of molasses in an amount of 500 ml is passed through 400 ml of cation exchanger KU-2 in the Ca-form, and then purified by defecoaturation with a consumption of lime 15% by weight of the dry matter of the solution to Latok pH, purified by defecosaturation after Ca-cationified, has molasses coefficient, 1.4 times smaller than the original. A more complete removal of non-sugars and a decrease in the molasses ratio ensured a 2.2 times decrease in sugar losses with molasses. Example 3. A solution of molasses in an amount of 500 ml is passed through 400 ml of anion-exchanger AB-17 in 504-form, and then through cation exchanger KU-2 in Ca-form, and then subjected to dekosaturation with a lime consumption of 10% by weight of dry matter of the solution and get molasses with a pH of 5-9.0. A parallel sample is subjected only to defaceosation cleaning with the same lime consumption (without passing through ion exchangers). The results are shown in Table. 3

8.5-9.0. The parallel sample is cleaned by defecation with the same lime consumption without passing through the cation exchanger.

In all samples, the values of normal good quality (DB) were determined according to P. M. Silin, i.e., the DB values of saturated molasses, having a viscosity of 71 pz at 40 ° C.

The results are presented in Table. 2

Table 2 The number of non-sugars removed is 3.5 times more than when cleaning the initial molasses solution that was not treated with ionites. At present, the losses of sugar with molasses when working by a known method are quite large — 2.5–2.8% by weight of beets. The proposed method of combining ion exchange and de-coke saturation removes more non-sugars from the sugar solution and replaces strong syrupters with weak ones, which reduces the loss of sugar in molasses by more than 2 times. The proposed method does not require acid-resistant equipment for its performance, and, being a salt ion exchange, virtually eliminates the loss of sucrose due to inversion.

For the regeneration of ion exchangers, such readily available and inexpensive reagents as CaCl2 and Na2SO4 are used. Fertilizers containing potassium can be made from spent regeneration solutions, which will reduce the cost of the ion-exchange unit. Industrial use of the proposed method will increase the sugar yield by 25% by weight of the beets, which will justify the cost of equipping sugar factories with ion-ion plants.

Claims (2)

1. A method for cleaning the edema of the sugar industry, which provides for defecosaturation of the mother liquor, characterized in that, in order to increase the cleaning effect, the effluent is passed through the cation resin in the form of a salt of a polyvalent metal before defecosation. 2. A method according to claim 1, characterized in that the solution is passed through the anion exchange resin in the mold before the cation resin.