PROCESS FOR THE REACTIVATION OF A CATALYST

摘要

1299666 Carbon dioxide ENGELHARD MINERALS & CHEMICALS CORP 3 April 1970 [4 April 1969] 16031/70 Heading C1A [Also in Division B1] Carbon monoxide is removed from a feed containing 0À01 to 3% vol. carbon monoxide, 50 to 99% vol. hydrogen, 0 to 5% vol. carbon dioxide and the remainder, if any, inert gas by oxidation of the carbon monoxide to carbon dioxide over a supported platinum group metal catalyst. Oxygen is mixed with the feed gas to give an O 2 : CO ratio of 0À5 : 1 to 3 : 1 and conditions used are an inlet temperature of 20-100‹ C. and a pressure of atmosphere to 500 p.s.i.g. In the Figure, a scheme is shown for producing a gas of low carbon monoxide content from a mixture of steam, air and natural gas which is fed in at line 1. The mixture is heated in furnace 2, heat exchanged in exchanger 4 then saturated with water vapour in vessel 6. The saturated gases pass by way of heat exchanger 4 to shift converter 8 in which CO is reacted with water vapour to produce CO 2 and H 2 . The effluent gases are cooled by water in tower 10 and then passed through monoethanolamine absorber 12 to remove carbon dioxide. The mixture at this stage typically comprises 0À1% CO 2 , 0À5% CO; 0À4% methane and 0À3% argon. The mixture is finally passed over the supported platinum metal catalyst in vessel 16 to remove the last traces of carbon monoxide, and then through CO 2 absorber 20 and gas cooler 22 to use, e.g. in ammonia synthesis. Lines 24 and 26 are provided so that the flow of the gas mixture over the catalyst may be reversed when the catalyst becomes deactivated so as to regenerate it without interrupting flow.