Method for treating paper mill condensate to reduce the amount o

Details Method for treating paper mill condensate to reduce the amount o Method for treating paper mill condensate to reduce the amount o

1997-09-11

1999-06-15

Silverman, Stanley S.

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Including recovery of organic by-product

162 29, 606415, 210750, D21C 1110, C02F 166

Patent

active

059118539

ABSTRACT:
The invention described in the specification is a method for removing hydrogen sulfide, volatile mercaptans and methyl sulfides from a paper mill condensate stream. In the method, carbon dioxide is injected into the condensate stream under pressure and the pressure of the resulting CO.sub.2 -enriched condensate is reduced rapidly to a pressure sufficient to cause hydrogen sulfide and volatile mercaptans to pass from the CO.sub.2 -enriched condensate to a gas phase. The gas phase containing hydrogen sulfide and mercaptans may then be recycled or burned and the treated condensate may be recycled for pulp washing. The method is very cost effective and can be easily retrofitted into existing paper mill systems without significant capital expenditures or production down time.

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