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:
Feb. 03, 1981
Filed:
Mar. 05, 1979
Kurt F Kaupisch, Burlington, KY (US);
Douglas W Bennett, Cincinnati, OH (US);
Raphael Katzen, Cincinnati, OH (US);
International Telephone & Telegraph Corporation, New York, NY (US);
Abstract
A process for the removal of sulfur dioxide and other contaminants and the recovery of ammonium sulfate as a by-product from a hot waste gas stream comprising cooling the waste gas stream to a temperature below 120.degree. F., passing said waste gas stream in sequence through at least two separate absorption zones utilizing as an absorbent a recirculated aqueous salt solution of ammonium sulfite-bisulfite, withdrawing and oxidizing a portion of said aqueous ammonium sulfite-bisulfite salt solution under pressures and temperatures sufficient to substantially convert the salts to sulfate salts, and recycling the ammonia and sulfur dioxide vapors liberated during oxidation to the first absorption zone.