Patent · US Active

Method of regenerating a catalyst

US7811955B2 · kind B2 · utility

4Cited by

4References

28Claims

0Family size

Assignee

BASF SF · DE

Inventors

Lee Rigby · Richmond, US
R. Merritt Sink · Lake Jackson, US

Key dates

Filing date	Nov 10, 2005
Grant date	Oct 12, 2010
Priority date	—
Expiry date	Jan 3, 2028

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S502/514
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

Platinum is applied on a carrier such as graphite to form a platinum catalyst. The catalyst becomes poisoned with a metal as a result of use of the catalyst in preparation of hydroxylammonium salts. A method of regenerating the catalyst dissolves the platinum and the metal in an acid. The method also adds ammonium sulfate to the acid to precipitate the platinum. The ammonium sulfate is a by-product of a commercial process to synthesize a caprolactam. Also, the method precipitates the platinum onto the carrier for reuse in the preparation of the hydroxylammonium salts and in preparation of the caprolactam.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.