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:
May. 28, 1991
Filed:
Jun. 02, 1989
Applicant:
Inventor:
Leo E Hakka, Dollard des Ormeaux, CA;
Assignee:
Union Carbide Canada Limited, Danbury, CT (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C01B / ; C01B / ; C01B / ;
U.S. Cl.
CPC ...
423243 ; 423228 ; 423229 ;
Abstract
Sulphur dioxide is removed from gas streams by contacting the gas stream with an absorbing medium containing less than about 80 wt. % of water and the spent absorbing medium subsequently is regenerated by removing absorbed SO.sub.2. The absorbing medium comprises amine salt absorbent having at least two amine groups, at least one of which is a salt and at least one of which has a pKa of about 4.5 to 7.3. The absorption is at a temperature of less than about 60.degree. C. The spent absorbing medium is regenerated under conditions such that at least one amine group remains in salt form.