Title: Process for preparation of potassium salts from pulping of lignocellulosic materials
Application Number: 86104368 Application Date: 1986.05.28
Publication Number: 1008898 Publication Date: 1987.02.25
Approval Pub. Date: 1992.06.03 Granted Pub. Date: 1992.06.03
International Classifi-cation: C01D5/00;D21C11/00
Applicant(s) Name: Potash Corp. Address:
Inventor(s) Name: Alfred Wong;Gary B. Derdall
Attorney & Agent: YANG LIQIN
Abstract:
    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 lignocellulosic material with a potassium-base aqueous cooling liquor to obtain an aqueous slurry of partially delignified pulp of the lignocellulosic material; (b) separating the pulp from the spent potassium-base aqueous cooling liquor; (c) concentrating the spent pulping liquor; and (d) recovering potassium salts including potassium carbonate, potassium sulphate and potassium lignosulphonate from the concentrated spent pulping liquor. The recovered potassium salts have numerous uses, an example being use in fertilizers.
Time: 5