D - Textiles – Paper – 21 – C
Patent
D - Textiles, Paper
21
C
9/16.5
D21C 9/00 (2006.01) D21C 1/00 (2006.01) D21C 11/06 (2006.01)
Patent
CA 1301412
A method in the activation of lignocellulosic material with a gas containing nitrogen dioxide ABSTRACT The present invention relates to a method of activating aqueous lignocellulosic material with a gas containing nit- rogen oxide, followed by a delignification stage for the purpose of obtaining a high quality end product with no or only a slight effect on the environment. In accordance with the inventive method, the lignocellulosic material is brought into contact with an oxygen-containing gas, and activating gas is separated from the lignocellulosic mate- rial during and/or subsequent to the activating process. The method is characterized by controlling the supply of oxygen- -containing gas such that the separated gas contains at least 2 kg nitric oxide (NO) calculated on 1000 kg of dry lignocellulosic material, and by reacting the separated gas in one or more stages with absorption solution whose origi- nal pH lies within the range 3-13.5, and by passing the gas purified with the aid of absorption solution to atmosphere, or to a destruction plant, optionally subsequent of further purification of the gas.
577358
Macrae & Co.
Mo Och Domsjo Aktiebolag
LandOfFree
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