SU407947A1 - METHOD FOR OBTAINING CRYSTALLINE pD-FRUCTOSES - Google Patents

Description

one

This invention relates to an improved method for isolating a compound that is used in a poor industry.

A known p-D-fructose crystallization detachment, the conclusion is that syrone, containing 86–87% dry weight, is dissolved in a ratio of 1: 5 in ethyl alcohol at a temperature of 75–78 ° C, is clarified with coal and filtered. The filtrate is self-cooled to 30 ° C, after which it is seeded with crystalline fructose and the temperature is lowered to 10-12 ° C. The crystallization process lasts several days, with occasional stirring and careful grinding of the syrup.

However, the process of crystallization of fructose from snrone released during the cooling of the alcohol solution is difficult. Fructose get cream colored, heterogeneous in structure. Ash content of 0.2--1.4%. The yield is 13-20%.

The proposed method for improving the purity and yield of the target product is characterized in that the fructose syrup is dissolved in ethyl alcohol at a ratio of 1: 8 when heated, then cooled to 12-14 ° C, and after settling and separating the resulting syrup, fructose is crystallized and the wire t crystallization at a temperature

equal to or higher than the one at which the formation and separation of the syrup occurred.

Usually, fructose syrup containing 86-87% of dry substances is dissolved in ethyl alcohol preheated to 68-70 ° C, and settling at 12-14 ° C is carried out for 30-48 hours. At the same time, a significant part of glucose and mineral oils is released from the alcohol solution in the form of syrup.

Pure white fructose is easily crystallized at 12–14 ° C from the alcoholic solution separated from the syrup. The complete crystallization process, as compared, ends after 5 days. The ash content is 0.03-0.06%. Output

31-40%.

Example. 16-17 l of fructose siron with a dry matter content of 86-87% are dissolved in a reactor, the nrn is mixed in a pre-heated to 68-70 ° C ethyl

alcohol. Pa every liter of sirona nodayut 8 liters of alcohol. In the process of dissolution in the reactor, the thermal energy is maintained within the range of 60-62 ° C by supplying hot water to the reactor jacket. After 10-12 minutes nosle full

After dissolving the syrup, 1.5 kg of air-dry activated carbon washed from chlorides are charged to the reactor, and the solution is clarified for 10 min, and then filtered on a second filter. The filtrate is cooled to 12--

i4 ° C by running cold water into the jacket of the mold and give exposure at this temperature for 30--48 hours. After this time, the alcohol solution becomes transparent, and 2-3.5 kg of dark brown syrup accumulates at the bottom of the crystallizer. A clear alcoholic solution of fructose was carefully transferred to another crystallizer, to which 100 g of crystalline fructose was added and, after stirring for a short time (5-10 minutes), left alone, all the while maintaining the temperature of the solution at 12-14 ° C.

After 18-20 hours, the crystallization of D-fructose begins. Beautiful, pure white crystals begin to grow on the walls and bottom of the mold, which are periodically removed with a wooden spatula.

After 5 days, the crystallization process is completely complete. After separation and drying, 6.5-7.2 kg of white crystalline fructose are obtained. After processing, 1, 2.2 kg of white crystalline fructose is obtained from the alcoholic mother liquor.

From the isolated syrup during cooling of the alcohol solution after recrystallizing it, 8–12 wt. % syrup pure

oats get white fructose.

Subject invention

The method of producing crystalline p-D fructose using the dissolving p-D-fructose syrup containing solids in ethanol when heating, cooling the solution, introducing crystalline fructose and subsequent crystallization, characterized in that, in order to increase purity and yield,

product, pD-fructose syrup containing solids is dissolved in ethanol in a ratio of 1: 8, after which the resulting solution is immediately cooled to 12-14 ° C, settled, the resulting syrup is separated and after crystallization of crystalline fructose after crystallization, crystallize at a temperature equal to or higher than the temperature of settling and separating the syrup.