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. 26, 1991
Filed:
Dec. 28, 1988
Applicant:
Inventors:
William B Fisher, Chester, VA (US);
Lamberto Crescentini, Chester, VA (US);
Laszlo J Balint, Chester, VA (US);
Assignee:
Allied-Signal Inc., Morris Township, Morris County, NJ (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C01B / ; C01B / ; C01B / ;
U.S. Cl.
CPC ...
423388 ; 423235 ;
Abstract
In the production of hydroxylamine disulfonate diammonium salt (DS) comprising reacting ammonium nitrite with ammonium bisulfite and sulfur dioxide in an absorption reactor whereby emission gases comprising NO.sub.x, particularly NO, are released as a result of side reactions, the method of treating said emission gases to reduce the concentration of NO comprises adding NO.sub.2 to the emission gases and contacting the mixture of NO.sub.2 and emission gases with an aqueous alkali solution sufficiently to form nitrite and nitrate ions in said alkali solution.