Method for treatment of lignocellulosic material with chlorine

Details Method for treatment of lignocellulosic material with chlorine Method for treatment of lignocellulosic material with chlorine

D - Textiles, Paper

21

C

8/79

D21C 3/18 (2006.01) D21C 9/10 (2006.01) D21C 9/12 (2006.01)

Patent

CA 1118161

ABSTRACT Delignification of pulp is achieved by chlorinating it at a consis- tency of 6 - 12 % preferably 8 - 10 % with chlorine gas which is dispersed into the pulp in the form of small gas bubbles. The chlori- ne is permitted to react with the lignin in the fibres for a period of 5 - 15 min, preferably approximately 10 min, whereafter the chlorinated lignin is removed by displacing the liquid in the pulp with a chlorine solution.

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