The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 16, 1981
Filed:
Jun. 01, 1979
Hitachi, Ltd., Tokyo, JP;
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.