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. 22, 2004
Filed:
Mar. 29, 2002
Toshio Ohi, Kawasaki, JP;
Yoshiharu Mizuno, Kawasaki, JP;
Tatsuharu Arai, Kawasaki, JP;
Koichi Nishimura, Kawasaki, JP;
Tsunekichi Kuriyama, Kawasaki, JP;
Yasuaki Toyomasu, Kawasaki, JP;
Toshitaka Hiro, Kawasaki, JP;
Showa Denko K.K., Tokyo, JP;
Abstract
Denitrated combustion exhaust gas is desulfurized with ammonia, the waste water obtained from washing the desulfurization waste water or dust ash is filtered using calcium carbonate, the pH of the filtrate is adjusted, carbon dioxide and/or aqueous carbonic acid is added and then a flocculating agent is added, and ammonia is recovered from the supernatant after precipitation and separation of the solid portion. The recovered ammonia is added to the denitrated gas for treatment of the combustion exhaust gas.