Effluent treatment in process for cellulosic fibrous...

Details Effluent treatment in process for cellulosic fibrous... Effluent treatment in process for cellulosic fibrous...

D - Textiles, Paper

21

C

D21C 3/22 (2006.01) B27N 1/00 (2006.01) C02F 1/02 (2006.01) C02F 3/28 (2006.01) C02F 11/04 (2006.01)

Patent

CA 2295268

A process for the preparation of a cellulosic fibrous aggregate, comprising a softening (hydrothermolysis) stage and a curing stage, whereby in the softening stage a section of cellulosic fibrous material is exposed to the action of a liquid aqueous softening agent at elevated temperature and at a pressure of at least the equilibrium vapour pressure of the softening agent at the operating temperature, in which at least part of an aqueous stream, contaminated with organic material, obtained as effluent stream from the zone wherein the softening has been effected, is subjected to an anaerobic purification treatment and at least part of the resulting purified aqueous stream is recycled to the hydrothermolysis stage.

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