Other

Praxair Technology, Inc.

Jorge Luiz Colodette

Carlos Roberto Xavier

Philippe Charlet

Philippe Georges Charlet

Julio Cesar Mascioli

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.

Method of digesting wood with an alkaline liquor by adding an acidic agent to precipitate dissociated lignin

Process for preparing improved sugar product

Treatment of pulp mill condensate with ozone

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Vicosa, Brazil

Jorge Luiz Colodette