Process for the production of cellulose acetate from wood pulp

Details Process for the production of cellulose acetate from wood pulp Process for the production of cellulose acetate from wood pulp

1991-03-19

1992-05-19

Alvo, Steve

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

With chemical or physical modification of liberated fiber

162 23, 162 76, 1621576, 536 69, 536 70, 536 71, C08B 306, D21C 106

Patent

active

051145359

ABSTRACT:
A process for making cellulose acetate from wood pulp takes wet wood pulp and instead of converting it into dry pulp sheet which is the usual feedstock for acetate, dries and mechanically separates the pulp into a cellulose flock using a pin mill through which a hot drying gas is passed. Deactivation of the cellulose is avoided by control of the drying gas exit temperature to 80.degree. C. to 95.degree. C. and of the moisture content of the cellulose flock to 4 to 15% by weight. The flock produced may be acetylated directly without any need for reactivation treatments additional to the normal activation with acetic acid.

REFERENCES:
patent: 1851008 (1932-05-01), Hanson et al.
patent: 2008021 (1935-07-01), Kenety
patent: 2054301 (1936-09-01), Richter
patent: 2105498 (1938-01-01), Parrett et al.
patent: 2393783 (1946-01-01), Kridel
patent: 2478396 (1949-08-01), Hincke et al.
patent: 2603637 (1952-07-01), Blackman et al.
patent: 4601759 (1986-07-01), Furubayashi et al.
patent: 5036900 (1991-08-01), Burley et al.

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