Purification process for coal gas methanation

Details Purification process for coal gas methanation Purification process for coal gas methanation

C - Chemistry, Metallurgy

10

K

48/46

C10K 1/00 (2006.01) C10K 1/20 (2006.01)

Patent

CA 1071873

Case 5522 IMPROVED PURIFICATION PROCESS FOR COAL GAS METHANATION Abstract of the Disclosure An improved method for removing sulfur compounds during coal gas methanation comprising removing essentially all carbon dioxide and hydrogen sulfide from synthesis gas, then adding carbon dioxide containing lower levels of sulfur back to the gas stream before feeding the mixture to a desulfurization reactor. Carbon dioxide, at levels above about 12 percent, will prevent high temperature methana- tion runaways in the hydrodesulfurization reactor, where a stream consisting essentially of hydrogen sulfite and methanation materials is produced, the lower level of hydrogen sulfite produced being removed by conventional methods before proceeding to methanation units. The carbon dioxide can be supplied either from an outside source or can be obtained from the synthetic natural gas after methana- tion.

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