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:
May. 25, 1976
Filed:
Apr. 30, 1975
Minoru Mizuno, Yokohama, JA;
Tomoji Iwata, Kawasaki, JA;
Nippon Kokan Kabushiki Kaisha, Tokyo, JA;
Abstract
NO.sub.x gas remaining in a purified exhaust, which has been desulfurized, in accordance with a publicly known method using coke oven gas, by washing the original exhaust containing SO.sub.2 and NO.sub.x with a water solution mainly consisting of ammonium sulfite concentrated to about 30 percent by weight, the pH value and the temperature thereof being adjusted to 6.1 to 6.5 and 50.degree. to 55.degree.C respectively, can be reformed into harmless N.sub.2 by passing said desulfurized exhaust through a reducing catalyst at a temperaure of 200.degree. to 450.degree.C, wherein ammonia gas naturally brought into said desulfurized exhaust from the washing solution acts as a reducing agent.