Nitrogen dioxide-oxygen delignification

Details Nitrogen dioxide-oxygen delignification Nitrogen dioxide-oxygen delignification

D - Textiles, Paper

21

C

9/16, 8/78.1

D21C 3/00 (2006.01) D21C 9/10 (2006.01)

Patent

CA 1070909

ABSTRACT OF THE DISCLOSURE A process for delignification of lignocellulosic material such as wood pulp, employing treatment with nitrogen dioxide followed by treatment with gaseous oxygen in alkaline medium. Use of the process results in a reduction of polluting materials in the process effluent. The process is capable of removing 75% to 90% of the lignin residue of a conventional kraft wood pulp. Because of the chloride free nature of the process effluent, this can be recycled to the pulping chemicals recovery furnace in amounts related to the washing efficiency after the oxygen stage.

251752

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