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:
Sep. 12, 2017
Filed:
Sep. 05, 2014
Wuhan Kaidi Engineering Technology Research Institute Co., Ltd., Wuhan, CN;
Bo Lai, Wuhan, CN;
Li Xu, Wuhan, CN;
Yiming Han, Wuhan, CN;
Qianqian Liu, Wuhan, CN;
Dechen Song, Wuhan, CN;
Abstract
A method for recovering ruthenium from a spent ruthenium-based catalyst carried on aluminum oxide includes: drying, calcining, and cooling a spent catalyst; grinding the spent catalyst into black powder; placing the black powder in a fluidized bed reactor, purging the reactor with hydrogen and heating the black powder to obtain ruthenium metal, then heating the black powder in a mixed atmosphere of oxygen and ozone to obtain RuOgas; absorbing the RuOgas with a sufficient amount of hydrochloric acid to obtain a HRuClsolution; adding an excess oxidant to the HRuClsolution to oxidize the HRuClinto HRuCl; adding excess NHCl to the HRuCland then filtering, and washing the filter cake to obtain solid (NH)RuCl; and reducing the solid (NH)RuClby hydrogen to obtain ruthenium metal.