CORROSION CONTROL IN AMMONIA EXTRACTION BY AIR SPARGING
First Claim
Patent Images
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; and
sparging a gas comprising oxygen into the solution in at least one of the ammonia absorber, the ammonia desorber, and therebetween.
1 Assignment
0 Petitions
Accused Products
Abstract
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 sparging an oxygen-containing gas into the solution in the ammonia absorber, the ammonia desorber, or therebetween. The invention also provides a system that can perform the method.
-
Citations
40 Claims
-
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; and sparging a gas comprising oxygen into the solution in at least one of the ammonia absorber, the ammonia desorber, and therebetween. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
-
-
36. A system for extracting ammonia with decreased corrosion, comprising:
-
ammonia extraction equipment comprising an ammonia absorber, an ammonia desorber, and an aqueous solution comprising an acid or an ammonium salt thereof; a gaseous stream comprising ammonia, wherein in the ammonia absorber at least part of the ammonia in the gaseous stream is converted into an ammonium salt, in the ammonia desorber at least part of the ammonium salt is converted into ammonia, and the aqueous solution is circulated between the absorber and the desorber; and a gas sparger that sparges gas comprising oxygen into the aqueous solution in at least one of the ammonia absorber, the ammonia desorber, and therebetween. - View Dependent Claims (37, 38, 39)
-
-
40. A method of decreasing corrosion during ammonia extraction, comprising:
-
performing a process to recover unreacted ammonia from a gaseous reactor effluent stream from an Andrussow process to generate hydrogen cyanide, wherein the process is performed using ammonia recovery equipment comprising an ammonia absorber, an ammonia desorber comprising an ammonia stripper tower and an ammonia stripper tower reboiler, and an aqueous solution comprising an acid or an ammonium salt thereof, wherein in the ammonia absorber at least part of the ammonia in the gaseous stream is converted into an ammonium salt, in the ammonia desorber at least part of the ammonium salt is converted into ammonia, and the aqueous solution is circulated between the absorber and the desorber; and sparging a gas comprising oxygen into the aqueous solution in the ammonia desorber or a reboiler of the desorber, sufficient to reduce corrosion of the desorber or the reboiler; wherein the gas sparging into the aqueous solution occurs at a rate sufficient to maintain a rate of oxygen sparging into the solution at about 1 scf for every about 500 lbs to about 5000 lbs of the aqueous solution that flow from the desorber to the absorber.
-
Specification