Process for delignifying and bleaching cellulose pulp

Details Process for delignifying and bleaching cellulose pulp Process for delignifying and bleaching cellulose pulp

D - Textiles, Paper

21

C

8/78.1, 9/16.5

D21C 9/10 (2006.01)

Patent

CA 1036757

ABSTRACT OF THE DISCLOSURE A process is provided for delignifying and bleaching cellulose pulp, which comprising carrying out the delignification and bleaching with oxygen and alkali in the presence of sodium bicarbonate, while removing carbon dioxide from the gas phase as required to maintain a carbon dioxide partial pressure with the range from about 0. 001 to about 3 bars, thereby improving the selectivity of the delignification and bleaching. The resulting cellulose pulp has a higher viscosity at a given lignin content and a higher yield of carbo- hydrates at a given lignin content.

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