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:
Nov. 15, 1994
Filed:
Aug. 02, 1993
Applicant:
Inventor:
John L Carey, Humberside, GB;
Assignee:
BP Chemicals Limited, London, GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B01J / ; B01J / ; C22B / ; C07C / ;
U.S. Cl.
CPC ...
502 24 ; 423 22 ; 502 25 ; 502 28 ; 502 32 ; 562891 ;
Abstract
In the process for recovery of Group VIII noble metal carbonylation catalyst from a process stream which also contains tar produced during a carbonylation process for carboxylic acid anhydride production, the process stream is diluted with alkyl halide and then extracted with a water, carboxylic acid, iodide salt alkyl halide solution, the iodide salt being a co-promoter derived from the carbonylation process. The recovered noble metal may be recycled to the carbonylation process with iodide salt co-promoter.