发明名称 |
Kontinuerlig kokning med kallimpregnering och kontroll av upplöst organiskt material (dom) |
摘要 |
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. |
申请公布号 |
SE0000342(L) |
申请公布日期 |
2000.04.07 |
申请号 |
SE20000000342 |
申请日期 |
2000.02.03 |
申请人 |
AHLSTROM MACHINERY INC |
发明人 |
STROMBERG BERTIL C;PROUGH ROBERT J;HENRICSON KAJ O;MARCOCCIA BRUNO S |
分类号 |
D21C1/06;D21C3/02;D21C3/24;(IPC1-7):D21C3/24 |
主分类号 |
D21C1/06 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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