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. 26, 1980
Filed:
Nov. 29, 1977
Applicant:
Inventors:
Yusaku Noshimura, Hitachi, JP;
Yasuo Koseki, Hitachi, JP;
Masayoshi Kubota, Hitachi, JP;
Shoji Kubota, Katsuta, JP;
Sankichi Takahashi, Hitachi, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B01J / ; B01J / ; B01D / ; B01J / ;
U.S. Cl.
CPC ...
252412 ; 210 32 ; 210 / ; 210 40 ; 2524 / ;
Abstract
A method of regenerating zeolite by heating wherein zeolite having adsorbed (NH.sub.3 -N) in foul water has sodium hydroxide added thereto, the sodium hydroxide containing Na.sup.+ equivalent to NH.sub.4.sup.+ adsorbed to the zeolite, water is added until the total quantity of the zeolite is submerged, and the resultant zeolite is heated at 400.degree. C. for 30 minutes, whereby a regeneration rate of 90% is attained.