KR920002205A - Method for Purifying Inert Gas Streams - Google Patents

Abstract

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Description

Method for Purifying Inert Gas Streams

As this is a public information case, the full text was not included.

1A and 1B are schematic diagrams of one embodiment of the present invention showing a batch process using three beds for inert gas stream purification and regenerating the beds;

2A and 2B are schematic diagrams of another embodiment of the present invention showing a batch process using two beds for purifying inert gas streams and regenerating the beds;

3 is a schematic diagram of another embodiment of the present invention showing a continuous process of purifying an inert gas stream using three beds;

4A and 4B are schematic diagrams of another embodiment of the present invention showing a batch process using a single bed for purifying an inert gas stream and regenerating the bed;

5A and 5B are schematic diagrams of another embodiment of the present invention showing a batch process using two beds and regenerating the beds.

Claims (32)

Passing an inert gas stream at a temperature as low as about -30 ° C. to facilitate conversion of carbon monoxide to carbon dioxide and passing at least one bed containing a material suitable for removing carbon dioxide from the inert gas stream and recovering the purified gas from the bed. And removing impurities selected from the group consisting of carbon monoxide, carbon dioxide, oxygen, hydrogen, and water vapor from the inert gas stream. The method of claim 1 wherein the method is performed outdoors under varying temperatures. The method of claim 1, wherein the method is performed at a temperature in the range of about −30 ° C. to + 40 ° C. 7. The method of claim 1, wherein the method is performed at a temperature in the range of 0 ° C. or less to about −30 ° C. 5. The method of claim 3, wherein the material is copper supported on aluminum. The method of claim 4, wherein the material is nickel supported on alumina or silica. The method of claim 1, further comprising regenerating the material with a purge gas. 8. The method of claim 7, wherein the purge gas contains a major amount of inert gas and a small amount of hydrogen. The method of claim 7, wherein the flow of the inert gas stream to be purified through the bed is terminated, the bed is heated to a temperature of about 200 ° C. or less, and an inert purge gas stream is passed through the bed and adsorbed inside the bed. Regenerating the bed by removing impurities. The process of claim 1 wherein the total amount of impurities in the feed stream is only about 10,000 ppm. The process of claim 10, wherein the feed streams each contain about 5.0 ppm or less of oxygen, carbon monoxide and hydrogen, and about 2.0 ppm or less of carbon dioxide and water vapor, respectively. 12. The process of claim 11, wherein said feed stream contains less than 3.0 ppm hydrogen. The inert gas stream is passed through a second bed containing a catalyst suitable for converting hydrogen to water vapor before passing the inert gas stream through a bed containing a material suitable for converting carbon monoxide to carbon dioxide. A method also comprising sikim. The method of claim 13, wherein said catalyst is selected from noble metals on an active support. 15. The process of claim 14, wherein the process is carried out in the presence of at least a stoichiometric amount of oxygen and the catalyst is selected from platinum, rhodium and combinations thereof on activated alumina. The method of claim 14, wherein the method is carried out in the presence of approximately stoichiometric amounts of oxygen and the catalyst is palladium on alumina. The method of claim 16, wherein the catalyst in the second bed also converts carbon monoxide to carbon dioxide. 15. The method of claim 14, wherein the catalyst contains palladium and copper on activated alumina. 19. The method of claim 18, wherein the catalyst contains about 0.5 to 1.0 weight percent palladium and about 8 to 12 weight percent copper. The method of claim 13, wherein the inert gas stream contains at least 3.0 ppm hydrogen. The method of claim 13, wherein the flow of the inert gas stream to be purified through the bed is terminated, the bed is heated to a temperature of about 200 ° C. or less, and an inert purge gas stream is passed through the bed and adsorbed inside the bed. Regenerating the bed by removing impurities. The method of claim 1 or 13, wherein the inert gas stream contains a catalyst suitable for converting carbon monoxide to carbon dioxide prior to passing the inert gas strip through a bed containing a material suitable for converting carbon monoxide to carbon dioxide. And also passing through another bed. The method of claim 22, wherein said catalyst in said another bed is at least one transition metal oxide. The method of claim 23, wherein the reaction is performed in the presence of less than stoichiometric amount of oxygen. The method of claim 23, wherein said catalyst in said another bed is a composition containing copper oxide and manganese. The method of claim 22, wherein the inert gas stream contains at least 3.0 ppm hydrogen and carbon monoxide, respectively. The method of claim 22, wherein the flow of the inert gas stream to be purified through the bed is terminated, the bed is heated to a temperature of about 200 ° C. or less, and an inert purge gas stream is passed through the bed and adsorbed inside the bed. Regenerating the bed by removing impurities. (a) converting carbon monoxide to carbon dioxide by passing an inert gas stream through a first bed containing a transition metal oxide; (b) converting hydrogen to water vapor by passing the inert gas stream from step (a) through a second bed containing palladium on alumina; (c) passing the inert gas stream from step (b) through a third bed containing a material suitable for converting carbon monoxide to carbon dioxide and adsorbing carbon dioxide, oxygen and water vapor at a temperature of about −30 ° C. to + 40 ° C., respectively. Removing impurities selected from the group consisting of carbon monoxide, carbon dioxide, oxygen, hydrogen and water vapor from the inert gas stream, comprising obtaining a gas product containing less than 1 ppm of impurities. 29. The method of claim 28, wherein said material in said third bed is selected from nickel or copper supported on alumina. The method of claim 28 further comprising regenerating the material with a purge gas. The method of claim 29, wherein the flow of the inert gas stream to be purified through the bed is terminated, the bed is heated to a temperature of about 200 ° C. or less, and an inert Perth gas stream is passed through the bed and adsorbed inside the bed. Regenerating the bed by removing impurities. The method of claim 28, wherein said method is performed outdoors under varying temperatures. ※ Note: The disclosure is based on the initial application.