Pulping processes

Details Pulping processes Pulping processes

D - Textiles, Paper

21

C

9/13

D21C 3/02 (2006.01) D21C 3/22 (2006.01)

Patent

CA 1104762

ABSTRACT OF THE DISCLOSURE A process for the delignification of lignocellulosic material wherein the lignocellulosic material is cooked with an alkaline or neutral sulphite pulping liquor containing at least 0.001% by weight of at least one of anthraquinones, phenanthrene quinones, napthoquinones, anthrones, benzoquinones, anthrahydroquinones, napthohydroquinones, phenanthrahydro- quinones, benzohydroquinones or the alkyl-, alkoxy-, hydroxy-, amino-, halo- or carboxy- derivatives of said quinones or hydroquinones and the tautomeric forms of said quinones or hydroquinones, where the pulping liquor is neutral sulphite and from amino and hydroxy derivatives of anthraquinones, phenanthraquinones, napthoquinones, anthrones and benzo- quinones and anthrahydroquinones, napthohydroquinones, phenanthrahydroquinones, benzohydroquinones or the alkyl-, alkoxy-, halo-, hydroxy-, amino-, or carboxy- derivatives of said hydroquinones and the tautomeric form of said hydro- quinones, when the pulping liquor is alkaline.

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