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:
Mar. 19, 1991
Filed:
May. 30, 1989
Mohan S Saran, Grand Island, NY (US);
Occidental Chemical Corporation, Niagara Falls, NY (US);
Abstract
Crude N,N-dialkylcarbamoylmethylphosphonates and phosphine oxide extractants, and particularly crude dihexyl N,N-diethylcarbamoylmethylphosphonate and octylphenyl N,N-diisobutylcarbamoyl phosphine oxide, are purified by distilling the crude materials in a thin film evaporator. Preferably, the crude dihexyl N,N-diethylcarbamoylmethylphosphonate is reacted with concentrated hydrochloric acid and subsequently reacted with aqueous sodium hydroxide prior to distillation in the thin film evaporator to hydrolyze impurities contained in the crude product. The purified extractants are useful for extracting actinides and lanthanides from liquid waste streams.