Process for producing low DP microcrystalline cellulose

Details Process for producing low DP microcrystalline cellulose Process for producing low DP microcrystalline cellulose

2006-01-17

2006-01-17

Halpern, Mark (Department: 1731)

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Continuous chemical treatment or continuous charging or...

C162S018000, C162S029000, C162S052000, C162S060000, C536S056000, C536S057000, C536S126000

Reexamination Certificate

active

06986828

ABSTRACT:
A process for producing microcrystalline cellulose. The process comprising the following steps:a) preparation of a pulp by repulping,b) pressing of the pulp obtained in a),c) decompaction of the pulp obtained in b),d) feeding of the pulp obtained in c) into a pre-heated reactor,e) cooking of the pulp at a temperature, a time and a pressure allowing to obtain a pulp having a desired degree of polymerization,f) cooling and partial controlled depressurization of the reactor by purging the reactor, followed by a water injection into the jacket and directly into the reactor,g) filtering the pulp obtained in f),h) bleaching of the pulp obtained in g), andi) drying the pulp obtained in h).The process allows the application of a controlled depressurization in step f), which in turn allows to keep the natural texture of the fibers and to obtain a cellulose having a low degree of polymerization.

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International Preliminary Examination Report of International Application No. PCT/CA01/01550, filed Nov. 2, 2001.

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