# Patent

## Title
Oscillator for a timepiece

## Abstract

It is now possible, utilizing the invention thus described to sweeten industrial gases with simplicity and economy. Our process does not require the design of new equipment and is suited to large scale processes. No costly reagents are required and, by using our regeneration process, the benefits of alkanolamine absorption/desorption processes may now be more fully realized.

## Background
## Claims

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: 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.]. .Iadd.accumulation .Iaddend.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 said 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: of ammonium ions, 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: (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.]. .Iadd.alkanolamine .Iaddend.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: containing solution for the absorption of acid gases therein; said ammonia whereby thiourea is formed; generate gaseous carbon dioxide and hydrogen sulfide and removing desorbed gases to purify said solution. .Iadd.

19.  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: 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 thiocyanates remaining in the absorbent whereby irreversible deterioration of said alkanolamine solution by said thiocyanates is suppressed. .Iaddend. .Iadd.

20.  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: 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 thermally stable alkanolammonium thiocyanate salts whereby irreversible deterioration of said alkanolamine solution by said alkanolammonium thiocyanates is suppressed..Iaddend.