EP 0309998 B1 19940223 - A method in the activation of lignocellulosic material with a gas containing nitrogen dioxide.
Title (en)
A method in the activation of lignocellulosic material with a gas containing nitrogen dioxide.
Title (de)
Verfahren in der Aktivierung von Lignocellulosematerial mit einem Stickstoffdioxid enthaltenden Gas.
Title (fr)
Procédé dans l'activation de matière lignocellulosique par un gaz contenant du dioxyde d'azote.
Publication
Application
Priority
SE 8703718 A 19870928
Abstract (en)
[origin: EP0309998A2] 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.
IPC 1-7
IPC 8 full level
D21C 3/16 (2006.01); D21C 1/00 (2006.01); D21C 9/00 (2006.01); D21C 9/10 (2006.01); D21C 9/147 (2006.01); D21C 11/06 (2006.01)
CPC (source: EP)
D21C 1/00 (2013.01); D21C 11/06 (2013.01)
Designated contracting state (EPC)
AT DE ES FR GB IT
DOCDB simple family (publication)
EP 0309998 A2 19890405; EP 0309998 A3 19910717; EP 0309998 B1 19940223; AT E101886 T1 19940315; AU 2283288 A 19890406; AU 605913 B2 19910124; CA 1301412 C 19920526; DE 3887948 D1 19940331; DE 3887948 T2 19940818; ES 2049234 T3 19940416; FI 884432 A0 19880927; FI 884432 A 19890329; FI 93231 B 19941130; FI 93231 C 19950310; JP 2510424 B2 19960626; JP H01104894 A 19890421; NO 172698 B 19930518; NO 172698 C 19930825; NO 884279 D0 19880927; NO 884279 L 19890329; NZ 226104 A 19900528; SE 460543 B 19891023; SE 8703718 D0 19870928; SE 8703718 L 19890329; ZA 887229 B 19890628
DOCDB simple family (application)
EP 88115896 A 19880927; AT 88115896 T 19880927; AU 2283288 A 19880927; CA 577358 A 19880914; DE 3887948 T 19880927; ES 88115896 T 19880927; FI 884432 A 19880927; JP 24220588 A 19880927; NO 884279 A 19880927; NZ 22610488 A 19880909; SE 8703718 A 19870928; ZA 887229 A 19880927