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:
Oct. 06, 2009
Filed:
Feb. 23, 2005
Hirokazu Narita, Ibaraki, JP;
Mikiya Tanaka, Ibaraki, JP;
Hirokazu Narita, Ibaraki, JP;
Mikiya Tanaka, Ibaraki, JP;
Abstract
There is provided a novel extractant for palladium capable of improving an extraction speed in comparison with a case of utilizing a DHS being a conventional extractant, and a method for separation and recovery of palladium utilizing the same. The present invention provides a method for obtaining a palladium-containing aqueous solution by bringing an organic phase containing an extractant of a sulfur-containing diamide compound represented by the following structural formula (1): in which Rand Reach represent a group selected from a chain hydrocarbon group having 1 to 18 carbon atoms which may be branched, an alicyclic hydrocarbon group having 1 to 10 carbon atoms, and an aromatic hydrocarbon group having 1 to 14 carbon atom, and Rrepresents a group represented by {(CH)S(CH)}in which n, m and L each represent an integer of from 1 to 4; extracting palladium by the organic phase; and conducting a back-extraction of palladium, extracted by the organic phase, with an aqueous solution of hydrochloric acid containing thiourea.