Method to improve pulp yield and bleachability of...

Details Method to improve pulp yield and bleachability of... Method to improve pulp yield and bleachability of...

D - Textiles, Paper

21

C

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

Patent

CA 2363793

Disclosed is a method for producing pulp, comprising digesting lignocellulosic wood, containing one or more xylan derivatives selected from the group consisting of xylan bound with lignin, xylan bound with hexenuronic acid, and mixtures thereof, with an aqueous alkaline pulping solution containing sulfide and having an initial free hydroxyl ion concentration of at least 1 mole per liter, under conditions whereunder xylan is dissociated from said one or more xylan derivatives and the pH of the solution remains above 12.5; and then while the pH of said solution is above 12.5, adding a sufficient amount of an acidic agent to said pulping solution to precipitate dissociated xylan from said pulping solution while minimizing precipitation of lignin from said pulping solution. Carbon dioxide is a preferred acidic agent.

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