Method for producing sodium hydrogen-carbonate and...

Details Method for producing sodium hydrogen-carbonate and... Method for producing sodium hydrogen-carbonate and...

C - Chemistry, Metallurgy

01

D

23/15, 23/182

C01D 7/16 (2006.01) C01B 7/03 (2006.01)

Patent

CA 1157228

ABSTRACT An improved process is disclosed for preparing sodium bicarbonate and hydrogen chloride by reacting aqueous sodium chloride solution with carbon dioxide in the presence of a tertiary amine and an organic solvent. The process comprises (1) introducing carbon dioxide into 3 mixture comprising (a) an aqueous sodium chloride solution, (b) a tertiary amine and (c) a polar organic solvent; (2) separating the resulting aqueous and organic phases; (3) freeing the aqueous phase from sodium bicarbonate and returning the aqueous phase to step (1) after concentration with sodium chloride; (4) removing water from the organic phase(s) of the polar organic solvent; and (5) heating the residue containing a non-polar solvent to drive off the hydrogen chloride.

361618

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