RU2340680C1 - Method of manufacturing raw sugar melt liquor - Google Patents

Abstract

FIELD: food products, chemistry.

SUBSTANCE: method implies melting raw sugar by hot sweet washed filtrate up to solids content of 53-57%, liming melt liquor, carbonatation up to pH of 9.2-9.5 and filtration. During melting raw sugar solution is treated by ozone-air mixture with the ozone concentration in the mixture equal to 5-15 g/nm³ and with the amount of ozone-air mixture equal to 3.0-4.5 nm³/m³ of the solution.

EFFECT: proposed method allows decreasing colour degree of the melt liquor, improving purification efficiency and reducing lime consumption as compared to the known process.

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Description

The invention relates to the sugar industry and can be used in the processing of raw cane sugar.

A known method for the production of sterilized sugar, including dissolving sugar in water to obtain a syrup, treating the syrup with ultraviolet radiation for 10-40 minutes after dissolving the sugar, treating the syrup with ozone, crystallization, whitening with a liquid medium saturated with ozone, and packaging for no more than 40 minutes after whitening (RU 2001121288 A, C13F 1/00, C13F 3/00, 07/10/2004).

The disadvantage of this method is a significant complication of the technological scheme and increased energy consumption in the production of sugar of standard quality.

The closest in technical essence and the achieved effect is a method for obtaining curing, including curing of raw sugar by hot washing and subsequent cleaning of curing (Sapronov A.R. Technology of sugar production. - 2nd ed., Corrected and add. - M .: Kolos, 1999 .-- P.382).

The disadvantage of this method is the relatively low effect of removing sugar in the process of subsequent cleaning.

The technical result of the invention is to increase the effect of cleaning cleverings during the processing of raw sugar and reduce the consumption of lime for cleaning clearing.

The technical result is achieved by the fact that in the method for producing raw sugar curing, it provides for hot curing with a promo wash to the content of CB 53-57%, clearing of the curing, saturation to pH 9.2-9.5 and filtration, in the process of curing the raw sugar solution treated with an ozone-air mixture with an ozone concentration of 5-15 g / nm ³ in the mixture, the amount of the ozone-air mixture being 3.0-4.5 nm ³ / m ^{3 of the} solution.

The method is as follows.

Raw cane sugar is glued with promoys. In the process of cloning, the solution is treated with an ozone-air mixture in an amount of 3.0-4.5 nm ³ / m ^{3 of a} solution with an ozone concentration of 5-15 g / nm ³ in the mixture. Mass fraction of solids in the obtained clearing 53-57%. Klerovka is directed to defecation with a CaO consumption of 1.6% by weight of raw sugar at a temperature of 80-90 ° C for 10 minutes. Next, a two-stage saturation is carried out to a pH of 9.2-9.5 and filtration.

Dissolved ozone leads to the destruction of the molecules of the initial compounds of high molecular weight compounds. Decomposition products have a significantly lower molecular weight than the starting compounds, as a result of which the content of high molecular weight substances causing a high viscosity of the curing is significantly reduced in the solution. In this regard, ozone treatment accelerates the dissolution of raw sugar, and also increases the cleaning efficiency due to the additional adsorption of oxidation products of non-sugars on calcium carbonate.

When treating a klerovka with an ozone-air mixture, intensive decomposition of monosaccharides occurs, the decomposition products of which are oxidized with the formation of permanent colorless compounds instead of being condensed into high molecular weight coloring substances. Thus, the formation of intensely colored compounds is prevented.

It has also been established that ozone has a direct bleaching effect on sugar products, reacting with previously formed coloring matter molecules. Thus, the oxidation of macromolecular compounds occurs, accompanied by a rupture of carbon chains, which is due to a decrease in color and a decrease in the viscosity of the sugar-containing solution.

The method is illustrated by the following examples.

Example 1. Raw cane sugar is glued with hot gouges at a temperature of 80 ° C to a solids content of 55%. Next, defecation is carried out by adding CaO at the rate of 2% to the weight of raw sugar, incubated for 10 minutes at a temperature of 85 ° C, saturated in two steps to a final pH of 9.2 and filtered. Filtered klerovka analyze.

H = 96.17%

Color = 22.08 conv. units

Mass fraction of PB = 0.225% to the mass of clearing.

Example 2. The method is carried out analogously to example 1, but the obtained clearing is treated with an ozone-air mixture in an amount of 1.5 nm ³ / m ^{3 of a} solution with a concentration of ozone in the mixture of 15 g / nm ³ . Then carry out the cleaning analogously to example 1, but with the consumption of lime for bowel movements of 1.6%. Filtered klerovka analyze.

H = 96.22%

Color = 21.86 conv. units

Mass fraction of PB = 0.218% to the mass of clearing.

Example 3. The method is carried out analogously to example 2, but the resulting clearing is treated with an ozone-air mixture in an amount of 3 nm ³ / m ³ solution with an ozone concentration in the mixture of 15 g / nm ³ . Next, purification is carried out analogously to example 2. Filtered clinging is analyzed.

H = 96.49%

Color = 19.72 conv. units

Mass fraction of PB = 0.188% to the mass of clearing.

Example 4. The method is carried out analogously to example 2, but the resulting clearing is treated with an ozone-air mixture in an amount of 4.5 nm ³ / m ^{3 of a} solution with an ozone concentration in the mixture of 15 g / nm ³ . Next, purification is carried out analogously to example 2. Filtered clinging is analyzed.

H = 96.74%

Color = 18.93 conv. units

Mass fraction of PB = 0.179% to the mass of clearing.

As can be seen from the results given in the examples, the greatest effect is achieved by treating the clearing with an ozone-air mixture in an amount of 3.0-4.5 nm ³ / m ^{3 of the} solution, since this increases the purity of the cleared clearing by 0.6%. A further increase in the consumption of the reagent is impractical, since the increase in purity and the decrease in the color of the purified clover are insignificant.

The proposed method provides a decrease in the color of clearing by 14.2%, a decrease in the mass fraction of reducing substances by 0.04%, and a decrease in the consumption of lime by 0.4% in comparison with the known method.

Claims (1)

A method for the production of raw sugar chelating, which involves hot curing with a wash to a CB content of 53-57%, clearing of bowels, saturation to a pH of 9.2-9.5 and filtration, characterized in that in the process of clering, the raw sugar solution is treated with ozone air mixture with an ozone concentration of 5-15 g / nm ³ in the mixture, while the amount of the ozone-air mixture is 3.0-4.5 nm ³ / m ^{3 of the} solution.