Alkaline pulping process

Details Alkaline pulping process Alkaline pulping process

D - Textiles, Paper

21

C

9/26

D21C 3/02 (2006.01) D21C 3/22 (2006.01)

Patent

CA 1200659

ALKALINE PULPING PROCESS ABSTRACT OF THE DISCLOSURE A process for the delignification of a lignocellulosic material, which comprises the steps of: (a) digesting the ligno- cellulosic material with an aqueous, alkaline pulping liquor con- taining from about 0.1% to about 10%, by weight of oven-dried lignocellulosic material, of a cyclic amino compound selected from the group consisting of phenazine, dihydrophenazine, quinox- aline, and their alkyl, alkoxy, hydroxy, carboxy and amino de- rivatives at a temperature of from about 150°C. to about 200°C. for a period of from about 5 to about 480 minutes; and then (b) removing the aqueous pulping liquor from the lignocellulosic material with water or an aqueous wash liquor inert to the ligno- cellulosic material to obtain a delignified cellulosic material. -1-

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