Process for preparing sodium carboxy-methyl cellulose

Details Process for preparing sodium carboxy-methyl cellulose Process for preparing sodium carboxy-methyl cellulose

1988-01-27

1990-07-17

Alvo, Steve

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

With chemical or physical modification of liberated fiber

162 25, 162 56, 162 77, 162 90, 1621576, 536 98, C08B 1100, D21H 1304

Patent

active

049419439

ABSTRACT:
The invention relates to a method and an equipment for preparing NaCMC, in which (a) cellulose is slushed in the reaction medium until a consistency of c. 5-15%, preferably 5-10%, (b) the fibre suspension obtained in step (a) is thickened to a consistency of c. 20-35% and (c) the pulp containing reaction medium obtained in the second step is homogenized by means of a screw conveyor having a screw pitch which decreases from an inlet opening thereof towards an outlet opening thereof, in order to increase the reactivity, whereby a mercerization activating the cellulose is carried out after step (b) and/or (c), and the cellulose thus pretreated is etherified in a manner known per se.

REFERENCES:
patent: 3615254 (1971-10-01), Eichenseer
patent: 4063018 (1977-12-01), Ohnaka et al.
patent: 4426518 (1984-01-01), Omiya
patent: 4444621 (1984-04-01), Lindahl
patent: 4507473 (1985-03-01), Bernert et al.
patent: 4508895 (1985-04-01), Balser

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