AMMONIA RECOVERY WITH PURGE FOR CORROSION CONTROL

摘要

The present invention relates to reduction of corrosion. The present invention includes a method of decreasing corrosion during ammonia extraction. The method includes performing a process to extract ammonia using ammonia extraction equipment. The ammonia extraction equipment includes an ammonia absorber, an ammonia desorber, and an aqueous solution. The aqueous solution includes an acid or an ammonium salt thereof. The method also includes purging at least part of the aqueous solution. The purged part of the aqueous solution includes at least one corrosion-promoting ion. The method also includes adding a replacement aqueous solution to the aqueous solution. The replacement aqueous solution has a reduced concentration of the at least one corrosion-promoting ion as compared to the purged part of the aqueous solution. The invention also provides a system that can perform the method.

主权项

1. A method of decreasing corrosion during ammonia extraction, comprising:
performing a process to extract ammonia using ammonia extraction equipment comprising an ammonia absorber, ammonia desorber, and an aqueous solution comprising an acid or an ammonium salt thereof; purging at least part of the aqueous solution, wherein the purged part of the aqueous solution comprises at least one corrosion-promoting ion; and adding a replacement aqueous solution to the aqueous solution, wherein the replacement aqueous solution has a reduced concentration of the at least one corrosion-promoting ion as compared to the purged part of the aqueous solution wherein the at least one corrosion-promoting ion is sulfate.