Method for the production of quality cotton yarns involving a low-cost process, free of environmental pollution
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United States of America Patent
Stats
-
Nov 17, 1998
Grant Date -
N/A
app pub date -
Jul 19, 1996
filing date -
Sep 6, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method for cotton purification is described, where the cotton is subject to a purification process in water. The process solution contains calcium hydroxide and a non-ionic detergent wetting agent. Following this processing the cotton is rendered hydrophilic. The cotton is carried in a net with simultaneous removal of the adsorbed processing solution. It is then washed and bleached with H.sub.2 O.sub.2 or ClONa in a two-stage process. The effluent water is processed by anaerobic digestion in the thermophilic region for the production of biogas. The effluent water from the anaerobic digestion process is further processed by aerobic biological treatment. The whole process operates with energy self-sufficiency without resulting in environment pollution. Finally, a high purity cotton is produced with high water absorptivity which is suitable for spinning for the production of quality cotton yarns suitable for weaving quality fabrics or dyeing.
First Claim
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