Process for controlling hemicellulose concentration during the m

Details Process for controlling hemicellulose concentration during the m Process for controlling hemicellulose concentration during the m

1979-10-26

1981-06-02

Clingman, A. Lionel

Bleaching and dyeing; fluid treatment and chemical modification

Chemical modification of textiles or fibers or products thereof

Cellulose fibers

536 56, 536 60, D06M 102

Patent

active

042709148

ABSTRACT:
The disadvantages stemming from a high content of hemicellulose in recirculated sodium hydroxide solutions used for the mercerization of cellulose in the preparation of viscose are reduced or eliminated by subjecting at least a part of the spent sodium hydroxide solution to an ultrafiltration process to remove part or all of the hemicellulose therein. The filtered sodium hydroxide liquor is supplied with make-up sodium hydroxide and is returned to the mercerization step.

REFERENCES:
patent: 3600379 (1971-08-01), Sihtola et al.
patent: 3728330 (1973-04-01), Sihtola et al.
patent: 4151207 (1979-04-01), Evju
H. Sihtola and L. Blomberg, Tappi, 1974, 57 (No. 7), pp. 73-75. _

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