Kraft pulping foul condensate treatment process and apparatus
AssigneeNoram Engineering and Constructors Ltd.
InventorsRohan Bandekar, James Theodore Wearing, Jonathan Edward Foan
Life of this patent
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Abstract
Processes and systems for treating Kraft pulping foul condensate are provided. The processes comprise removing volatile compounds from the foul condensate to produce a resulting condensate and removing methanol from the resulting condensate. The systems comprise a volatile compound removal stage and a methanol removal stage downstream of and in fluid communication with the volatile removal stage.
Claims9
A foul condensate treatment process comprising:
- (a) removing volatile compounds from foul condensate by an air stripper to produce a resulting condensate;
- (b) maintaining the temperature of the foul condensate in the air stripper between about 50° C. and about 60° C.;
- and
- (c) removing methanol from the resulting condensate.
A foul condensate treatment process comprising:
- (a) removing volatile compounds from foul condensate by an air stripper to produce a resulting condensate, wherein a mass of oxygen-containing gas is used to strip the foul condensate in the air stripper and the mass of oxygen-containing gas is controlled to maintain the oxygen-containing gas below its Lower Explosive Limit (LEL);
- and
- (b) removing methanol from the resulting condensate.
A foul condensate treatment process comprising:
- (a) removing volatile compounds from foul condensate by an air stripper to produce a resulting condensate, wherein a mass of oxygen-containing gas is used to strip the foul condensate in the air stripper and the mass of oxygen-containing gas is less than about 10% by weight (wt. %) of the mass of the foul condensate supplied to the air stripper;
- and
- (b) removing methanol from the resulting condensate.
A foul condensate treatment process comprising:
- (a) removing volatile compounds from foul condensate by a first steam stripper to produce a resulting condensate;
- (b) maintaining the temperature of the foul condensate below about 100° C. in the first steam stripper;
- and
- (c) removing methanol from the resulting condensate.
A foul condensate treatment process comprising:
- (a) removing volatile compounds from foul condensate by a first steam stripper to produce a resulting condensate, wherein a mass of steam used to strip the foul condensate in the first steam stripper is less than about 10% by weight (wt. %) of the mass of the foul condensate supplied to the first steam stripper;
- and
- (b) removing methanol from the resulting condensate.
A foul condensate treatment process comprising:
- (a) removing volatile compounds from foul condensate to produce a resulting condensate;
- (b) maintaining the temperature of the resulting condensate above about 100° C. in the second steam stripper;
- and
- (c) removing methanol from the resulting condensate by a second steam stripper.
A foul condensate treatment process comprising:
- (a) removing volatile compounds from foul condensate to produce a resulting condensate;
- (b) removing methanol from the resulting condensate by a second steam stripper;
- and
- (c) maintaining the temperature of the resulting condensate between about 100° C. and about 120° C. in the second steam stripper.
A foul condensate treatment process comprising:
- (a) removing volatile compounds from foul condensate to produce a resulting condensate, and
- (b) removing methanol from the resulting condensate by a second steam stripper, wherein a mass of steam used to strip the resulting condensate in the second steam stripper is greater than about 10% by weight (wt. %) of the mass of the foul condensate supplied to the second steam stripper.
Dependencies are inferred from the claim text.