Title:
RECOVERY OF CATALYST IN PRODUCTION OF ADIPIC ACID
Document Type and Number:
Japanese Patent JP3863950
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a method for recovering a catalyst used for producing adipic acid.
SOLUTION: This method for recovering a catalyst in production of adipic acid comprises separating (a) the adipic acid from a reactional solution, (b) passing the resultant reactional solution through a sulfonated ion exchanger, bonding iron, copper and vanadium ions to the sulfonated ion exchanger, (c) separating the ion exchanger from the reactional solution, (d) washing the separated ion exchanger with nitric acid and providing an acid eluate, (e) passing the acid eluate through an ion exchanger modified with an aminophosphonate group and removing the iron ions from the acid eluate in the method for selectively removing the iron ions from the reactional solution prepared when oxidizing cyclohexanol into the adipic acid with nitric acid by using the concentrated nitric acid in the presence of a copper and/or a vanadium salts.
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Inventors:
Herbert Salzburg
Georg Schyutainhof
Heiko Hoffman
Helmut Kaponitzk
Georg Schyutainhof
Heiko Hoffman
Helmut Kaponitzk
Application Number:
JP25734896A
Publication Date:
December 27, 2006
Filing Date:
September 09, 1996
Export Citation:
Assignee:
Bayer Aktiengesellschaft
International Classes:
B01J23/22; B01J23/72; C07C51/42; B01J35/12; B01J38/74; C07B61/00; C07C51/27; C07C51/47; C07C55/14; (IPC1-7): C07C55/14; B01J23/22; B01J23/72; B01J35/12; B01J38/74; C07C51/27; //C07B61/00
Domestic Patent References:
| JP4275255A | ||||
| JP7002722A | ||||
| JP7502926A |
Foreign References:
| US3554692 | ||||
| US3186952 |
Attorney, Agent or Firm:
Aoyama Aoi
Yasuo Shibata
Yasuo Shibata