Title:
【発明の名称】リグノセルロ―ス材料を二酸化窒素を含有するガスで活性化する方法
Document Type and Number:
Japanese Patent JP2510424
Kind Code:
B2
Abstract:
Method of activating aqueous lignocellulosic material with a gas containing nitrogen 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 (18) with an oxygen-containing gas (19), and activating gas is separated from the lignocellulosic material during and/or subsequent to the activating process (9). The method is characterized by a) controlling the supply of oxygen-containing gas (12) such that the separated gas (27) contains at least 2 kg nitric oxide (NO) calculated on 1000 kg of dry lignocellulosic material, and by b) reacting the separated gas (27) in one or more stages (26) with absorption solution (25) whose original pH lies within the range 3-13.5, and by passing (28) the gas purified with the aid of absorption solution to atmosphere, or to a destruction plant optionally subsequent ot further purification of the gas.
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Inventors:
HANSU OROFU SAMUERUSON
Application Number:
JP24220588A
Publication Date:
June 26, 1996
Filing Date:
September 27, 1988
Export Citation:
Assignee:
MO OCH DOMSJOE AB
International Classes:
D21C1/00; D21C9/00; D21C9/10; D21C3/16; D21C9/147; D21C11/06; (IPC1-7): D21C9/147; D21C3/16
Domestic Patent References:
| JP62141186A |
Attorney, Agent or Firm:
Akaoka Mio