Importance

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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 delignification, comprising in combination: (1) a first reaction chamber receiving water-containing lignocellulosic material, nitrogen oxide, and optionally oxygen containing gas; (2) a first inlet for introducing lignocellulosic material into the first reaction chamber; (3) a second inlet with control means for introducing nitrogen oxide into the first reaction chamber; (4) a first outlet for withdrawing lignocellulosic material after reaction with oxide from the first reaction chamber; (5) gas locks retaining gas pressure in the first reaction chamber at each of the first inlet outlet; (6) a second reaction chamber in connection with the first reaction chamber via the gas lock at the outlet thereof and receiving lignocellulosic material after reaction with nitrogen oxide; (7) a third inlet with control means for introducing oxygen into the second reaction chamber; (8) a second outlet for withdrawing lignocellulosic material after reaction with oxygen from the second reaction chamber; and (9) 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 and preferably at least 10 times the volume of the first reaction chamber.

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First Claim