Method and system for pulp processing using cold caustic...

Details Method and system for pulp processing using cold caustic... Method and system for pulp processing using cold caustic...

D - Textiles, Paper

21

C

D21C 3/02 (2006.01) D21C 3/00 (2006.01) D21C 11/04 (2006.01)

Patent

CA 2744250

A method for pulp processing includes a cold caustic extraction stage in which the spent cold caustic solution and the spent liquid used to wash the extracted pulp are concentrated by an evaporation system. The concentrated liquid can be used as part of the neutralization and cooking liquor in the pulp process, leading to increased efficiency without significant reduction in pulp quality. Highly concentrated filtrate from the cold caustic extraction stage may help reduce hemicellulose deposition on wood fiber during the cooking step.

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