SU977494A1 - Process for purifying sugar-bearing liquor - Google Patents

Description

(54) METHOD FOR CLEANING SUGAR-CONTAINING SOLUTION

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The invention relates to methods for purifying sugar juices from salts, for example calcium salts, by introducing chemical reagents therein and can be used in the sugar industry.

In the process of sugar beet production, calcium salts are formed, which contribute to the deposition of scale in evaporating and vacuum apparatus, as a result of which the heat transfer coefficient decreases, and the yield and loss of sugar in molasses increase. Reducing the content of calcium salts is a pressing issue for the sugar industry.

The crtoco6 purification of sugar juices from salts is known by introducing chemical reagents into them. Soda 1 is used as a chemical reagent.

The disadvantage of this method is the low quality of purification and the formation of a precipitate of high dispersion, which causes difficulty in filtering.

There is also known a method for purifying sugar juices from calcium salts, which consists in introducing a chemical reagent into them, in which ammonium carbonate is used in an amount equivalent to the content of soluble calcium salts 2. The disadvantage of this method is the insufficiently high quality of purification due to that the introduction of nitrogen-containing chemical reagents promotes the formation of dyes.

The closest technical solution to the present invention is a method for purifying a sugar-containing solution, which involves saturating the latter and introducing a reagent for precipitating calcium and magnesium salts into a saturated solution. Trisodium phosphate 3 is used as a chemical reagent.

The disadvantages of this method are the insufficiently high quality of purification and the formation of poorly filtering sediments, which makes it difficult to separate them by filtration.

The purpose of the invention is to improve the quality of the purified sugar-containing solution.

The goal is achieved by the fact that according to the method of purification of sugar-containing solution, which involves saturation of the latter and the introduction of reagent to precipitate calcium and magnesium salts into the saturated solution, the difference is that sodium silicate is used in the amount of 0.01-0.15 ° / o to the volume of the solution. The cleaning method is as follows. To the purified sugar-containing solution after saturation, for example, juice II of saturation, a 1-5% solution of sodium silicate is added at the rate of 0.01-0.155% by volume of the solution being purified and the mixture is stirred. When introduced into the solution to be purified, the latter interacts with ions and an insoluble precipitate of CaSiOj forms. The formation of the latter occurs quickly, and, most importantly, the particles of the latter are large aggregates that quickly precipitate and are well filtered. Thus, by adding, better filtration of the precipitated Ca and Mg salts is achieved, their removal is more complete, and due to this, the quality of the purified juice is improved. Example. The proposed method is carried out by factory juice of carbonation II, obtained during the processing of beets in 1980, the following composition CB-14.8%, DB 90.2%, chroma 18.2 ° C / 100 CB, alkalinity 0.018% CaO, the content of calcium salts is 0.185% CaO. Samples of this juice in the amount of 100 ml are placed in flasks of 100/110 ml (up to the bottom label), then 1, 2, 4, 6, 8 and 10 ml of a 2.5% aqueous solution of sodium silicate distilled are added to these samples. with water the volume of the flasks is adjusted to 110 ml (to the second label). The contents of the flasks are stirred, incubated for 2 minutes and then filtered. In the filtrates, the salt content is determined by complexometric titration using dark blue chromogen as an indicator. The table shows the comparative data of the proposed and known methods.

Claims (1)

Claim The method of purification of a sugar-containing solution, which involves saturation of the latter and the introduction of a reagent into the carbonized solution to precipitate calcium and magnesium salts, characterized in that, in order to improve the quality of the sugar-containing solution, sodium silicate in an amount of 0.01-0.15% is used as a reagent to the volume of the solution.