Apparatus for treating lignocellulosic material with a gas...

Details Apparatus for treating lignocellulosic material with a gas... Apparatus for treating lignocellulosic material with a gas...

D - Textiles, Paper

21

C

92/56

D21C 7/00 (2006.01) D21C 9/10 (2006.01)

Patent

CA 1232785

ABSTRACT Apparatus for reacting lignocellulosic material with a gas phase comprising a nitrogen oxide and oxygen under controlled gas pressure in the presence of water, for example, as a pretreatment before an alkaline delignif- ication, comprising in combination: (1) a first reaction chamber receiving water-containing lignocellulosic material, nitrogen oxide, and optionally oxygen containing gas; (2) a first and second inlets for introducing lignocellulosic material and nitrogen oxide; (3) a first outlet for withdrawing reacted lignocellulosic material; (4) a second reaction chamber in connection with the first reaction chamber via a gas lock at the outlet thereof and receiving reacted lignocellulosic material; (5) a third inlet for introducing oxygen; (6) a second outlet for withdrawing reacted lignocellulosic material; and (7) a gas lock retaining gas pressure in the second reaction chamber at the second outlet. The second reaction chamber having a volume that is at least 2.5 times the volume of the first reaction chamber.

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