Title:
【発明の名称】低温浸透とDOM制御を有する連続蒸解方法
Document Type and Number:
Japanese Patent JP3447264
Kind Code:
B2
Abstract:
A method of treating wood chips allows chemical pulp (e. g. kraft pulp) to be produced having enhanced fiber strength properties. In a first zone or stage the chips are cool impregnated (e. g. a temperature of about 60-120 DEG C.) with a first alkali-containing liquid (25-35 g/l expressed as NaOH). In the top of a continuous digester in a second zone or stage the chips are then treated with a second alkali-containing liquid having an alkali concentration at least 5 g/l less than the first liquid (e. g. 10-20 g/l) and a temperature of between about 120-160 DEG C. (e. g. 130-150 DEG C.). An extraction typically takes place to effect the change in treatment zones. After the second zone the chips are cooked at about 140-180 DEG C. (e. g. 150-170 DEG C.), and higher than in the second zone.
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Inventors:
C. Bertil Stromberg
James Robert Pluff
Oh Kai Henrixon
Bruno S. Marcosia
James Robert Pluff
Oh Kai Henrixon
Bruno S. Marcosia
Application Number:
JP2000506411A
Publication Date:
September 16, 2003
Filing Date:
August 03, 1998
Export Citation:
Assignee:
Andritz Incorporated
International Classes:
D21C1/06; D21C3/02; D21C3/24; (IPC1-7): D21C3/24; D21C3/02
Domestic Patent References:
| JP8511583A |
Other References:
【文献】国際公開96/007787(WO,A1)
Attorney, Agent or Firm:
Shizuo Nakamura