D - Textiles – Paper – 21 – C
Patent
D - Textiles, Paper
21
C
D21C 3/02 (2006.01) C21C 7/00 (2006.01)
Patent
CA 2070133
19 ABSTRACT A conventional continuous digester is modified to effect alkali extraction of lignin after washing. After washing at the bottom of the digester, the chips are reduced to fibers and then subjected to alkali extraction. Reduction of fibers takes place by mechanically acting on the chips with a rotating element, and/or by causing the chips to flow through a high speed, turbulent zone for a short period of time. The extraction zone is provided by an upright conduit within the digester vessel, concentric with it, and having an open bottom spaced above the closed bottom of the digester vessel, and above the rotating element. The diameter of the lowermost portion of the upright conduit is significantly less than the diameter of the main body of the upright conduit. During alkali extraction, the fibers are maintained under the same pressure as in the digester, at a temperature of greater than about 100°C, and in an alkaline environment (normally just with alkali remaining from digesting). After alkali extraction the pulp is cooled and then passed through a blow valve adjacent the top of the digester.
Bereskin & Parr
Kamyr Inc.
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