Title:
【発明の名称】高い硫化度を有する、硫酸塩パルプ蒸解用蒸解液の製造方法
Document Type and Number:
Japanese Patent JP2815701
Kind Code:
B2
Abstract:
The invention relates to a process for preparation, under reducing conditions, of cooking liquors having high sulphidity for sulphate pulp cooking, wherein the black liquor obtained in the cooking process is fed, after evaporation, completely or partly to a reactor operating at increased temperature which is obtained by energy supply from an external heat source and/or release of energy from the black liquor, a melt essentially consisting of sodium sulphide being formed and withdrawn to be further processed to cooking liquor. The process of the invention is characterized in that in addition there are fed to the reactor the whole or part of sulphur-containing and/or sulphur- and sodium-containing materials present in the pulp mill, including sulphur-containing and/or sodium- and sulphur-containing make-up chemicals used for the total chemicals balance of the pulp mill, in such a way that the mole ratio of sodium to sulphur in the total mixture fed to the reactor is within the range of 1.5 to 4. According to a preferred embodiment of the invention there is used an aqueous solution of the sodium sulphide melt obtained in so-called modified sulphate cooking.
Inventors:
Head Brom, Mats-Olov
Lindberg, Hans
Lindberg, Hans
Application Number:
JP50032190A
Publication Date:
October 27, 1998
Filing Date:
November 21, 1990
Export Citation:
Assignee:
Siemlek Activola Get
International Classes:
D21C3/02; D21C11/04; D21C11/12; D21H17/00; (IPC1-7): D21C11/04; D21C3/02
Domestic Patent References:
| JPS63237790A | ||||
| JPS62166881A | ||||
| JP54045543B | ||||
| JPS63501401A |
Attorney, Agent or Firm:
Hajime Tsukuni (2 outside)