Method for obtaining carbon dioxide for soda production by the ammonia method Russian patent published in 2021 - IPC C01B32/50 B01D53/14 

FIELD: chemical technology.

SUBSTANCE: invention relates to obtaining carbon dioxide for the production of calcinated soda by the ammonia method. Waste gases of cement production containing 16-22% by volume of carbon dioxide are concentrated by absorption-desorption with aqueous solutions of monoethanolamine and monoethanolbenzylamine in a molar ratio of 1-3:1, or monoethanoldimethylamine and ethylenediamine in a molar ratio of 3:1, or a mixture of them under a pressure of 0.1-1.6 Mpa and at a temperature from 50-132°С to minus 25-45°С. The resulting carbon dioxide, with a content of at least 50% by volume, is mixed with a gas containing 35-38% by volume of carbon dioxide obtained by roasting limestone containing at least 90% by volume of calcium carbonate. As a result, carbon dioxide with a content of at least 40-44% by volume is obtained.

EFFECT: development of a method for producing carbon dioxide used in the production of calcinated soda from waste gases of cement production and thermal power plants, increasing the concentration of СО₂ and its quality, reducing energy costs.

2 cl, 3 dwg, 3 ex