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2 632 699

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(51)

IPC

C01D1/42(2006-01-01)

(21) (22)

Application

2016138025, 2016-09-23

(24)

Start date

2016-09-23

(22)

Actual filing date

2016-09-23

(45)

Published

2017-10-09

(72)

Inventor

Butorin Pavel BorisovichTishchenko Anatolij VladimirovichBobrin Vladimir StepanovichButorina Tatyana AlekseevnaBobrina Desislava SergeevnaBobrina Mariya Sergeevna

(73)

Holder

Obshchestvo S Ogranichennoj Otvetstvennostyu

METHOD FOR PRODUCING CAUSTIC SODA Russian patent published in 2017 - IPC C01D1/42

Abstract RU 2632699 C1

FIELD: chemistry.

SUBSTANCE: method for concentrating the caustic soda solution involves pre-evaporation of the solution and final concentration to 98-99 wt %. Pre-evaporation is conducted to a concentration of caustic soda in a solution of 65-75 wt %, then the solution is heated to 300-350°C and fed to the heat exchanger, allowing direct solution contact with water vapour having an inlet temperature of 600-650°C and pressure up to 200 atm. The resulting solution, superheated to a temperature of 600-650°C, is finally concentrated by throttling with a decrease in pressure.

EFFECT: simplifying the process while reducing energy costs.

4 cl

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RU 2 632 699 C1

Authors

Butorin Pavel Borisovich

Tishchenko Anatolij Vladimirovich

Bobrin Vladimir Stepanovich

Butorina Tatyana Alekseevna

Bobrina Desislava Sergeevna

Bobrina Mariya Sergeevna

Dates

2017-10-09—Published

2016-09-23—Filed