D - Textiles – Paper – 21 – C
Patent
D - Textiles, Paper
21
C
9/2
D21C 11/00 (2006.01)
Patent
CA 1206304
Abstract An improved pulping method which comprises the steps of: (a) digesting a lignocellulosic material with a digesting liquid to obtain a first mixture; (b) separating the first mixture into a pulp and a digestion waste liquor; (c) treating the digestion waste liquor with a magnesia- containing adsorbing agent to adsorb thereon at least a part of the organic components contained in the waste liquor and to obtain a second mixture; (d) separating the second mixture into a solids-rich phase including the organic components-carrying adsorbing agent and a liquid phase containing magnesium components dissolved therein; and (e) subjecting at least a portion of the organic components-carrying adsorbing agent to a calcining treatment for the removal of the organic components therefrom by combustion and for the regeneration of the adsorbing agent. The method is c h a r a c t e r i z e d i n t h a t said second mixture is added with an alkaline substance to increase its pH and to precipitate at least a part of the magnesium components dissolved therein, whereby the concentration of the magnesium components dissolved in said liquid phase is decreased.
441839
Ikari Yoshikatsu
Inoue Haruhiko
Katoh Keisuke
Yokoyama Shoichiro
Director-General Of Agency Of Industrial Science And Technology
Kunimine Industries Co. Ltd.
Sim & Mcburney
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