Process for removing harmful components from gas
US4273748A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 1, 1979 |
| Grant date | Jun 16, 1981 |
| Priority date | — |
| Expiry date | Jun 1, 1999 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D53/58
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A reducing gas, such as a synthetic fuel gas, produced by gasification of a fossil fuel, containing ammonia or both ammonia and hydrogen sulfide, is purified by passing the reducing gas at first, through a first removing agent of iron or nickel system when the hydrogen sulfide is contained, and then through a second removing agent of iron or nickel system, both at elevated temperatures. For example, when the reducing gas contains both ammonia and hydrogen sulfide, the gas is passed through the first removing agent at a temperature of 450.degree.-700.degree. C. to remove substantially all of the hydrogen sulfide and then is passed through the second removing agent at a temperature of greater than 700.degree. C., preferably up to 900.degree. C., to remove substantially all of the ammonia contained in the gas. Not only a remarkable effect upon prevention of environmental pollution but also a great improvement of energy efficiency, as compared with the conventional process, can be obtained.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.