Title:
【発明の名称】セルロースパルプの製造方法
Document Type and Number:
Japanese Patent JPH04502790
Kind Code:
A
Abstract:
The present invention solves the problem of delignifying technical cellulose pulp in a selective manner which will result in very low residual contents of lignin in the pulp and a correspondingly high quantity of lignin dissolved in spent liquors, which are recovered in the chemical recovery system of the pulp mill. The invention constitutes a method and comprises activating liquid-containing lignocellulosic material in the presence of nitrate with a gas that contains nitrogen dioxide, followed by the alkaline delignification of the lignocellulosic material, and measuring the acidity of the liquid accompanying the material on at least one occasion during the activation. The method is characterized in that the acidity of the liquid is measured subsequent to bringing the time derivative of the nitrate concentration of the liquid, expressed as millimols per litre of liquid per minute, to a level beneath +0.2, and by using the measured acidity value to establish the optimum amount of mineral acid for continuation and termination of the activation, and by charging the whole of this quantity or a part of this quantity of mineral acid to the lignocellulosic material.
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Inventors:
Samuelson, Hans Olof
Application Number:
JP50240590A
Publication Date:
May 21, 1992
Filing Date:
January 16, 1990
Export Citation:
Assignee:
Moe, Ock, Domjoe, Actie Borrag
International Classes:
C08B1/00; D21C9/10; D21C1/04; D21C3/02; (IPC1-7): D21C9/10
Attorney, Agent or Firm:
Akaoka Mio