Method and apparatus for alkaline delignification of...

Details Method and apparatus for alkaline delignification of... Method and apparatus for alkaline delignification of...

D - Textiles, Paper

21

C

9/16

D21C 9/06 (2006.01) D21C 9/10 (2006.01) D21C 9/18 (2006.01)

Patent

CA 1275759

METHOD AND APPARATUS FOR ALKALINE DELIGNIFICATION OF LIGNOCELLULOSIC FIBROUS MATERIAL ABSTRACT OF THE DISCLOSURE A process is disclosed for the pretreatment of lignocellulosic fibrous materials prior to delignification. The process in one of its embodiments is comprised of the following steps: 1. Contacting the pulp material with treated filtrate and alkali for a short reaction period of about 1 to 2 minutes at 40°C, 2. Withdrawing part of the liquid phase by filtration, 3. Displacing substantially all of the remaining liquid phase with treated filtrate, and 4. Allowing the pulp to react under conditions normally used for alkaline extraction or oxygen delignification. The treated filtrate is obtained by subjecting the liquor removed from the pulp at steps 2 and 3 to temperatures of 50 to 60°C for periods of about 5 to 10 minutes. Alternatively, step 3 can be eliminated.

501953

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