D - Textiles – Paper – 21 – C
Patent
D - Textiles, Paper
21
C
9/24, 9/36
D21C 11/00 (2006.01) C01D 5/00 (2006.01) C05D 1/00 (2006.01) D21C 3/02 (2006.01) D21C 3/06 (2006.01) D21C 11/12 (2006.01)
Patent
CA 1255058
ABSTRACT OF THE DISCLOSURE Described herein is a process for producing potassium salts from potassium-based liquors for pulping of lignocellulosic material. The process comprises the steps of: (a) digesting the lignocellulosic material with the potassium- base aqueous cooking liquor to obtain an aqueous slurry, the slurry comprising partially delignified pulp of said lignocellulosic material and spent pulping liquor and the potassium-base cooking liquor comprising potassium sulphite, potassium bisulphite, potassium sulfide or combinations thereof; (b) treating the aqueous slurry to separate the spent pulping liquor from said pulp; (c) concentrating and oxidizing the spent pulping liquor without substantially changing the sulphidity of the spent pulping liquor; and (d) recovering from the concentrated, oxidized pulping liquor the potassium salt. The recovered potassium salts find numerous uses, an example being use in fertilizers.
482516
Derdall Gary B.
Wong Alfred
Gowling Lafleur Henderson Llp
Potash Corporation Of Saskatchewan
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