SU1375919A1 - Method of spray drying of colloidal materials - Google Patents

Abstract

The invention is mb, used in chemical and food industry. The purpose of the invention is to increase the bulk density of the dried material. For this, the temperature of the solution fed to the nozzle 15 is set equal to the dew point of the drying agent supplied to the blower, and the speed of the latter in the gas supply pipe 16 is taken to be equal to the exit velocity of the sprayed solution from the nozzle, 1 sludge.

Description

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The invention relates to a drying technique and can be used in the spray drying of colloidal materials in the chemical, food and other industries.

The purpose of the invention is to increase the bulk density of the dried material.

The drawing shows the implementation of the proposed method in a plant for drying a solution of polycarbonate in methylene chloride.

The installation contains a spray dryer 1, a fluidized bed dryer 2, a cyclone 3, a fan 4, a mixing condenser 5, a heater 6, a fan 7, a surface condenser 8, a separator 9, a heater 10, a filter 11, a fan 12, heat 20 the exchanger 13, the pump 14, the nozzle 15, the gas supplying nozzle 16, the feeder 17, the discharge device 18 and the heat exchanger 19.

Drying is subjected to a 12% solution of 25 polycarbonate in methylene chloride. A mixture of nitrogen and methylene chloride vapor is used as a drying agent. The circulation of the drying agent is carried out as in the main circuit - spray dryer 1, cyclone 3 ,. fan 4, mixing condenser 5, heater 6 and additional circuit - fan 7, surface condenser 8, separator 9, heater 10, - boiling bed dryer 2, filter 11, fan 12.

The dried solution is served by the pump 14 through the heat exchanger 13 in form 13759192

hole 15. The root zone of the flare of the spray is blown off by a co-current of drying agent, which enters the gas supply pipe 16 from the preheater 6. The temperature of the solution fed to the nozzle 15 is set equal to the dew point of the drying agent, and the velocity of the latter in the gas supply pipe 16 is equal to the speed exit spraying solution from the nozzle.

In heat exchangers 13 and 19 use,

The brine is heated at a temperature of -12 ° C, and in the surface condenser 8 - with a temperature.

From the drying dryer 1, the semi-finished product with the feeder 17 is fed to the dryer of the fluidized bed 2, from where the dried polycarbonate is fed to the granulation through the discharge device 18.

Claims (1)

Invention Formula The method of rapid drying of colloidal materials, predominantly polycarbonate solution, nyTei-i, their spraying using a nozzle and blowing a spray torch by a co-current re-circulating drying agent, in order to increase the bulk density of the dried material, the temperature of the disintegrated material is equal the dew point of the drying agent supplied to the airflow, and the speed of the latter is taken to be equal to the exit speed of the disintegratable material from the nozzle.