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:
Aug. 11, 2015
Filed:
Nov. 01, 2013
Mitsubishi Heavy Industries, Ltd., Tokyo, JP;
Fumiaki Sato, Tokyo, JP;
Hiroyuki Furuichi, Tokyo, JP;
Yudai Kato, Tokyo, JP;
Kazuo Ishida, Yokohama, JP;
MITSUBISHI HEAVY INDUSTRIES, LTD., Tokyo, JP;
Abstract
A method includes a first step of, with a CO.HS stripper maintained to have a pressure higher than atmospheric pressure, from the ammonia-containing wastewater, discharging COand HS in a form of gas having a low moisture concentration from a tower top of the CO.HS stripper while discharging an ammonia-containing solution from a tower bottom of the CO.HS stripper; a second step of introducing the ammonia-containing solution obtained after the first step into an ammonia stripper which is maintained to have a lower pressure than that of the CO.HS stripper, and thereby discharging a gas rich in ammonia containing a small amount of HS and COfrom a tower top of the ammonia stripper while discharging water usable as industrial water from a tower bottom of the ammonia stripper; and a third step of introducing the ammonia rich gas obtained after the second step into a washing tower which is maintained to have a lower pressure than that of the ammonia stripper, and thereby discharging a wastewater containing a Na compound from a tower bottom of the washing tower while discharging a HS-free gas rich in ammonia from a tower top of the washing tower.