Distillation: processes – separatory – Water purification only – Under pressure or vacuum
Patent
1995-10-06
1997-07-01
Warden, Robert J.
Distillation: processes, separatory
Water purification only
Under pressure or vacuum
203 75, 203 76, 203 77, 203 92, 203 93, 203 94, 423352, 518704, 518705, 568913, B01D 338
Patent
active
056434200
ABSTRACT:
An apparatus and method for treating chemical production plant process condensate such that a contaminant-rich stream and a relatively pure aqueous stream is separately recoverable from the condensate, wherein the contaminants are substantially removed from the condensate by steam stripping and subsequent rectification in a relatively low pressure stripping/rectification tower. The tower overhead is then condensed, and any non-condensed gases are subjected to water scrubbing to further recover contaminates from the non-condensed gas. A portion of the condensed overhead and scrubbing water containing contaminates is returned to the top of the rectification section of the tower as reflux and the balance being withdrawn as a concentrated stream for reuse in the plant. The apparatus may be used in conjunction with existing low pressure equipment, avoiding costly major modifications, and is particularly adapted to use in conjunction with ammonia and methanol plants.
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Farmland Industries, Inc.
Tran Hien
Warden Robert J.
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