Method of oxygen delignification of digested fibre pulp

Details Method of oxygen delignification of digested fibre pulp Method of oxygen delignification of digested fibre pulp

D - Textiles, Paper

21

C

8/78.1, 9/16.5

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

Patent

CA 1118160

ABSTRACT A method of oxygen delignification of digested wood pulp in which oxygen and an alkali are mixed with the pulp at a temperature in the range 90 - 130°C in a first stage at above atmospheric pressure. In a second stage treatment the amount of oxygen is reduced, by addition of alkali, and the pressure is reduced continuously. In a third stage the temperature is dropped suddenly so as to condense the steam together with any turpentine present.

298820

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