Purification process for coal gas methanation
US3977843A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 5, 1975 |
| Grant date | Aug 31, 1976 |
| Priority date | — |
| Expiry date | Dec 5, 1995 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10K1/20
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
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 methanation runaways in the hydrodesulfurization reactor, where a stream consisting essentially of hydrogen sulfide and methanation materials is produced, the lower level of hydrogen sulfide 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 methanation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.