Process for preparing chemical paper pulps by cooking, intermedi

Details Process for preparing chemical paper pulps by cooking, intermedi Process for preparing chemical paper pulps by cooking, intermedi

1987-11-18

1988-11-29

Alvo, Steve

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Chemical treatment after start or completion of mechanical...

162 72, 162 78, 162 90, D21C 302, D21C 320, D21C 326, D21C 916

Patent

active

047879599

ABSTRACT:
A process of preparing new chemical paper pulps wherein a first cooking stage is effected in the presence of sodium hydroxide and advantageously adjuvants, after which an intermediate grinding is effected and followed by a second cooking stage characterized in that the second cooking stage is performed in the presence of a peroxide alkaline solution containing a peroxide stabilizing agent.

REFERENCES:
patent: 1890179 (1932-12-01), Helder
patent: 2487114 (1949-11-01), Dreyfus
patent: 2527563 (1950-10-01), McEwen
patent: 3650887 (1972-03-01), Grangaard
patent: 4012280 (1977-03-01), Holton
patent: 4294653 (1981-10-01), Lindahl

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