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公开(公告)号:BRPI0410759B1
公开(公告)日:2014-03-04
申请号:BRPI0410759
申请日:2004-05-21
Applicant: BASF AG
Inventor: ZUEHLKE JUERGEN , NETO SAMUEL , ROSOWSKI FRANK , STORCH SEBASTIAN
IPC: C07C51/265 , C07C51/31 , C07C63/16
Abstract: A description is given of a process for preparing aldehydes, carboxylic acids and/or carboxylic anhydrides, in particular phthalic anhydride, in which a gaseous stream comprising an aromatic hydrocarbon and molecular oxygen is passed at elevated temperature over a bed of a first catalyst and a bed which is made up of a second catalyst having a higher activity than the first catalyst and is located downstream of the first catalyst in the flow direction of the gaseous stream, wherein the catalytically active composition of the first catalyst comprises at least vanadium oxide, titanium dioxide and antimony oxide and the ratio of vanadium, calculated as V 2 O 5 , to antimony, calculated as Sb 2 O 3 , in the first catalyst is from 3.5:1 to 5:1. The source of antimony oxide used for the first catalyst is preferably particulate antimony trioxide having a mean particle size of from 0.5 to 5 mum. The process allows the desired oxidation products to be obtained in high yield over longer periods of time.
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公开(公告)号:BRPI0410759A
公开(公告)日:2006-06-27
申请号:BRPI0410759
申请日:2004-05-21
Applicant: BASF AG
Inventor: ZUEHLKE JUERGEN , NETO SAMUEL , ROSOWSKI FRANK , STORCH SEBASTIAN
IPC: C07C51/265 , C07C51/31 , C07C63/16
Abstract: A description is given of a process for preparing aldehydes, carboxylic acids and/or carboxylic anhydrides, in particular phthalic anhydride, in which a gaseous stream comprising an aromatic hydrocarbon and molecular oxygen is passed at elevated temperature over a bed of a first catalyst and a bed which is made up of a second catalyst having a higher activity than the first catalyst and is located downstream of the first catalyst in the flow direction of the gaseous stream, wherein the catalytically active composition of the first catalyst comprises at least vanadium oxide, titanium dioxide and antimony oxide and the ratio of vanadium, calculated as V 2 O 5 , to antimony, calculated as Sb 2 O 3 , in the first catalyst is from 3.5:1 to 5:1. The source of antimony oxide used for the first catalyst is preferably particulate antimony trioxide having a mean particle size of from 0.5 to 5 mum. The process allows the desired oxidation products to be obtained in high yield over longer periods of time.
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