Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
METHODS AND DEVICES FOR SEPARATING CATALYST FROM OXIDATION MIXTURES CONTAINING DIBASIC ACIDS
Document Type and Number:
WIPO Patent Application WO1999037599
Kind Code:
A3
Abstract:
This invention relates to methods and reactor devices for controlling the oxidation of hydrocarbons to dibasic acids in the presence of a catalyst and a monobasic acid, by removing the catalyst from the reaction mixture, outside the oxidation zone, after the oxidation has taken place at least partially. Initially, the catalyst is partially precipitated and removed by reducing the water level in the reaction mixture and/or subjecting the reaction mixture to a temperature at which or over which catalyst precipitates. After the initial partial precipitation of the catalyst, the mother liquor remaining is subjected to a thermal treatment during which at least the major part of the monobasic acid is removed leaving behind molten dibasic acids, in which the remaining catalyst precipitates substantially in its totality, and it is removed. The precipitated catalyst in the two precipitation stages may be recycled in miscellaneous ways.

Inventors:
DECOSTER DAVID C (US)
VASSILIOU EUSTATHIOS (US)
DASSEL MARK W (US)
ROSTAMI ADER M (US)
DUDGEON DOUGLAS J (US)
Application Number:
US9826054W
Publication Date:
September 30, 1999
Filing Date:
December 08, 1998
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
TWENTY-FIRST CENTURY RESEARCH CORPORATION
DECOSTER, DAVID, C.
VASSILIOU, EUSTATHIOS
DASSEL, MARK, W.
ROSTAMI, ADER, M.
DUDGEON, DOUGLAS, J.
International Classes:
C07C51/31; C07C51/42; C07C55/14; C08G63/90; C08G69/46; C08G73/10; (IPC1-7): C07C51/31; C07C51/42
Domestic Patent References:
WO1996003365A11996-02-08
Foreign References:
EP0494416A21992-07-15
DE2309423A11974-08-29
DE4427474A11996-02-08
US3161603A1964-12-15
Download PDF: