Process for controlling hemicellulose concentration during the mercerization of cellulose
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United States of America Patent
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Jun 2, 1981
Grant Date -
N/A
app pub date -
Oct 26, 1979
filing date -
Oct 26, 1979
priority date (Note) -
Expired
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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.
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