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:
Jan. 10, 1995
Filed:
Jul. 20, 1992
Applicant:
Inventors:
Matti Hiltunen, Karhula, FI;
Kurt Westerlund, Helsinki, FI;
Assignee:
A. Ahlstrom Corporation, Noormarkku, FI;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C01B / ;
U.S. Cl.
CPC ...
4232 / ; 588206 ;
Abstract
A method of cooling hot flue or process gases containing halogenous compounds in two successively located circulating fluidized bed reactors. In the first reactor the gases are cooled to a temperature of >400.degree. C. In the second reactor the gases are rapidly cooled to below a temperature zone of 250.degree.-400.degree. C. In the first reactor the gases are brought into contact with a catalytic material capable of destroying polyhalogenous compounds. A retention time of 1-10 seconds, preferably 2-5 seconds, is provided for the gases in the first reactor.