Separating sulphur in the form of hydrogen sulphide from...

Details Separating sulphur in the form of hydrogen sulphide from... Separating sulphur in the form of hydrogen sulphide from...

D - Textiles, Paper

21

C

9/36.3

D21C 11/12 (2006.01) C01B 17/16 (2006.01) D21C 11/00 (2006.01)

Patent

CA 1041708

ABSTRACT OF THE DISCLOSURE The invention relates to a process for separating hydrogen sulphide from clarified green liquor, including precarbonating green liquor with a carbon dioxide rich gas, adding alkali bi- carbonate to the precarbonated green liquor and stripping hyd- rogen sulphide therefrom forming simultaneously alkali carbonate, and preparing the alkali bicarbonate used in the process from the alkali carbonate formed. The process of the invention is carried out by performing the hydrogen sulphide stripping without crys- tallizing the alkali carbonate formed, preparing the alkali bi- carbonate partly from alkali carbonate-alkali sulphide solution obtained in the precarbonation step and partly from the non- crystallized alkali carbonate solution, feeding at least a por- tion of the alkali carbonate - alkali sulphide solution through the carbonation step, and passing the carbon dioxide rich gas first through the carbonation step and thereafter through the precarbonation step.

211435

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