Improved process and composition for delignifying a...

Details Improved process and composition for delignifying a... Improved process and composition for delignifying a...

D - Textiles, Paper

21

C

D21C 3/04 (2006.01) C01B 15/08 (2006.01) D21C 9/10 (2006.01) D21C 9/16 (2006.01) D21H 11/02 (2006.01)

Patent

CA 2154778

A process for delignifying a ligno- cellulosic material comprising exposing the material at pH 6.0 to 9.5 to a mixture of monopersulfuric acid and a ketone of for- mula (I), wherein R1 and R2 are indepen- dently selected from the group consisting of alkyl and aryl, or R1 and R2 together form a carbocycle. Also disclosed is a kraft pulp delignification mixture comprising in combination: (a) water, (b) from about 0.05 to about 0.3 moles per liter of a ketone as above; (c) from about 0.0008 to about 0.50 moles per liter of monopersulfuric acid; and (d) sufficient buffer to maintain the pH between about pH 6 and about pH 9.5.

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