Regeneration of alkanolamine absorbing solution in gas sweetening processes
阅读：125发布：2023-04-01
专利汇可以提供Regeneration of alkanolamine absorbing solution in gas sweetening processes专利检索，专利查询，专利分析的服务。并且A catalytic amount of ammonia or ammonium compounds are utilized to prevent deterioration of alkanolamines employed in gas sweetening processes. The ammonia is added either to the sour gas or the absorbing solution and acts to suppress thiocyanate formation during absorption.，下面是Regeneration of alkanolamine absorbing solution in gas sweetening processes专利的具体信息内容。
1. IN COMBINATION WITH AN AQUEOUS ALKANOLAMINE ABSORPTION/DESORPTION PROCESS WHEREIN INDUSTRIAL GASES ARE SWEETENED BY REMOVAL OF ACID GASES INCLUDING HYDROGEN CYANIDE AND SULFIDE GASES, A PROCESS FOR PREVENTING IRREVERSIBLE DETERIORATION OF THE ALKANOLAMINE SOLUTION COMPRISING: MAINTAINING SUFFICIENT AMMONIUM IONS IN THE ALKANOLAMINE SOLUTION DURING ABSORPTION TO INSURE A CONTINUED PRESENCE OF SAID AMMONIUM IONS IN THE ALKANOLAMINE SOLUTION DURING THE ABSORPTION PROCESS, SAID AMMONIUM ACTING AS A DETERRENT WITH RESPECT TO THE FORMATION OF THIOCYANATES WHEREBY IRREVERSIBLE DETERIORATION OF SAID ALKANOLAMINE SOLUTION BY SAID THIOCYANATES IS SUPPRESSED.
2. The process of claim 1 in which the industrial gas is coke oven gas.
3. The process of claim 1 in which the ionizable form of ammonia supplied is substantially ammonia.
4. The process of claim 1 in which the ionizable form of ammonia is substantially an aqueous solution of an ammonium salt of a weak acid.
5. The process of claim 2 in which the ionizable form of ammonia supplied is substantially ammonia.
6. The process of claim 2 in which the ionizable form of ammonia is substantially an aqueous solution of an ammonium salt of a weak acid.
7. The process of claim 2 in which the ionizable form of ammonia is ammonia in an amount of at least about 0.2 mole percent of the industrial gas.
8. The process of claim 2 in which the ionizable form of ammonia is an aqueous solution of an ammonium salt of a weak acid in the amount of about 0.2 to 1 weight percent of the absorbing solution.
9. The process of claim 7 in which the alkanolamine is substantially monoethanolamine.
10. The process of claim 8 in which the alkanolamine is substantially monoethanolamine.
11. The process of claim 1 in which at least part of the ionizable ammonia is supplied by recirculating desorbed solution.
12. An improved gas sweetening process for removing acid gases from industrial gases containing hydrogen cyanide and sulfide components by means of aqueous alkanolamine absorbing solutions without irreversible deterioration of the absorption capacity of the alkanolamine solution due to combination of the alkanolamine with thiocyanates comprising: a. absorbing the acid gases into the alkanolamine solution in the presence of ammonium ions, b. desorbing the acid gases from the alkanolamine to regenerate the solution and recirculating the regenerated and undeteriorated alkanolamine solution back to the absorbing step.
13. An improved method of gas sweetening according to claim 12 wherein ammonium ions are maintained in both the absorption and desorption steps of the gas sweetening process.
14. An improved method of gas sweetening according to claim 13 additionally comprising: c. recovering ammonia from the foul gases leaving the desorption step of (b) and recycling said ammonia to the absorption step of (a).
15. An improved method of gas sweetening according to claim 13 wherein the ammonia is recycled to the absorption step of (a) along with the recirculated alkanolamine solution from the desorption step of (b).
16. An improved method of gas sweetening according to claim 12 wherein the ammonia is provided in excess of the molar amount which would theoretically be necessary to form thiourea from thiocyanates.
17. An improved method of gas sweetening according to claim 16 in which solution of the elevated temperature in the desorption step is sufficient to decompose thiourea if present, to gaseous carbon dioxide and hydrogen sulfide.
18. In combination with an alkaholamine absorption/desorption process wherein industrial gases are sweetened by removal of acid gases including hydrogen cyanide and sulfide gases, a process for preventing irreversible deterioration of the alkanolamine solution comprising: a. providing prior to the absorbing process, an aqueous alkanolamine containing solution for the absorption of acid gases therein; b. providing ammonia in ionizable form; c. absorbing acid gases into said alkanolamine solution in the presence of said ammonia whereby thiourea is formed; d. desorbing said solution including reacting said thiourea with water to generate gaseous carbon dioxide and hydrogen sulfide and removing desorbed gases to purify said solution.
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