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:
Dec. 30, 2014
Filed:
Apr. 23, 2013
Mitsubishi Heavy Industries, Ltd., Tokyo, JP;
National University Corporation Akita University, Akita-shi, Akita, JP;
Masashi Kiyosawa, Tokyo, JP;
Katsumi Nochi, Tokyo, JP;
Norihisa Kobayashi, Kanagawa, JP;
Kozo Iida, Hiroshima, JP;
Katsuyasu Sugawara, Akita, JP;
Yuuki Mochizuki, Hokkaido, JP;
Mitsubishi Heavy Industries, Ltd., Tokyo, JP;
National University Corporation Akita University, Akita-shi, Akita, JP;
Abstract
A separation and recovery method that enables titanium and tungsten to be separated and recovered from a used DeNOx catalyst in high yield. Specifically, a method of separating and recovering metal elements that includes a first heating step of heating a DeNOx catalyst containing titanium, tungsten, vanadium and iron in a chlorine atmosphere, thereby removing the vanadium and the iron from the DeNOx catalyst, and a second heating step, performed after the first heating step, of heating the DeNOx catalyst in a chlorine atmosphere while the catalyst is exposed to a gas of a hydrocarbon compound (excluding CH) or an oxygen-containing carbon compound, thereby volatilizing the tungsten and the titanium from the DeNOx catalyst, and recovering the tungsten and the titanium from the DeNOx catalyst.