Mooch Domsjo Ab

Nils O Nilsson

Leif U Thorsell

A process is provided for preparing cellulose pulp by delignification of lignocellulosic material, which comprises subjecting particulate lignocellulosic material in a pulping zone to the pulping action of a pulping liquor at a temperature at which pulping reactions leading to formation of cellulose pulp proceed, and substances having a molecular weight above about 3500, preferably above about 2000, and preferably above about 1500, are physically separated and removed from the lignocellulosic material and become dispersed in the pulping liquor; in the course of the pulping, withdrawing pulping liquor containing such dispersed substances, and removing such dispersed substances therefrom; and then returning the pulping liquor to the pulping zone.

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Sjalevad, Sweden

Nils O Nilsson