SYSTEMS AND METHODS FOR AMMONIA RECOVERY, ACID GAS SEPARATION, OR COMBINATION THEREOF
First Claim
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1. A process for separating or recovering basic gases comprising:
- absorbing ammonia from an ammonia containing gas stream into an ammonia-lean solution, forming an ammonia-rich solution;
enriching said ammonia rich solution with one or more acid gases; and
precipitating one or more ammonia-acid gas salts wherein said precipitating occurs before enriching, during enriching, after enriching, or a combination thereof.
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Abstract
The present invention relates to processes and systems for ammonia recovery and/or acid-gas separation. In some embodiments, a system for acid gas separation may be integrated with an ammonia abatement cycle employing a high temperature absorber. In some embodiments, a system for acid gas separation may employ a higher temperature absorber due to the lower energy consumption and cost of the integrated ammonia abatement cycle. Advantageously, heat may be recovered from the absorber to power at least a portion of any acid gas desorption in the process. Reverse osmosis or other membranes may be employed.
10 Citations
29 Claims
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1. A process for separating or recovering basic gases comprising:
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absorbing ammonia from an ammonia containing gas stream into an ammonia-lean solution, forming an ammonia-rich solution; enriching said ammonia rich solution with one or more acid gases; and precipitating one or more ammonia-acid gas salts wherein said precipitating occurs before enriching, during enriching, after enriching, or a combination thereof. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A process for separating or recovering basic gases comprising:
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(a) absorbing ammonia from an ammonia containing gas stream into an ammonia-lean, an ammonia-ultra-lean, or ammonia-free solution, to form an ammonia-rich solution; (b) enriching said ammonia-rich solution with one or more acid gases to form an ammonia-rich, acid gas rich solution; and (c) concentrating said ammonia-rich, acid gas rich solution using one or more membranes to form a retentate and a permeate wherein said permeate is suitable for use as at least a portion of the ammonia-ultra-lean or ammonia-free solution in step (a). - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. An integrated process for separating or recovering basic gases comprising:
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(1) a first cycle comprising; absorbing ammonia from an ammonia containing gas stream into an ammonia-lean solution, forming an ammonia-rich solution; enriching said ammonia rich solution with one or more acid gases; precipitating one or more ammonia-acid gas salts wherein said precipitating occurs before enriching, during enriching, after enriching, or a combination thereof; and separating at least a portion of said precipitate from any remaining liquid; and (2) a second cycle comprising; (a) absorbing ammonia from an ammonia containing gas stream into an ammonia-lean, an ammonia-ultra-lean, or ammonia-free solution, to form an ammonia-rich solution; (b) enriching said ammonia-rich solution with one or more acid gases to form an ammonia-rich, acid gas rich solution; and (c) concentrating said ammonia-rich, acid gas rich solution using one or more membranes to form a retentate and a permeate wherein said permeate is suitable for use as at least a portion of the ammonia-ultra-lean or ammonia-free solution in step (a) of the second cycle. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. The process of claim 33 wherein the volume ratio of second retentate to second permeate is greater than about 2:
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Specification