Preparation of sodium carbonate anhydride

Details Preparation of sodium carbonate anhydride Preparation of sodium carbonate anhydride

C - Chemistry, Metallurgy

01

D

23/19

C01D 7/12 (2006.01) C01D 7/37 (2006.01)

Patent

CA 1083776

ABSTRACT OF THE DISCLOSURE A concentrated suspension of sodium carbonate anhydride is obtained by countercurrent contacting of a high pres- sure steam and a suspension of sodium bicarbonate or sodium sesquicarbonate in a thick solution of sodium carbonate. The decomposition reaction is promoted to near completion by maintaining the reaction temperature above 150°C to realize a high HCO3- ion concentration in the solution. The sodium carbonate anhydride sus- pension is cooled to cause transition of the anhydride to the monohydrate, followed by the separation of the crystalline monohydrate from the mother liquor. Calci- nation of this monohydrate gives a dense soda ash featuring a high purity and a uniform particle size, while the mother liquor is recycled for the preparation of the sodium bicarbonate suspension. - 1 -

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