Production of aldehydes, carboxylic acids and/or carboxylic...

Details Production of aldehydes, carboxylic acids and/or carboxylic... Production of aldehydes, carboxylic acids and/or carboxylic...

2008-05-13

2008-05-13

Eyler, Yvonne (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acids and salts thereof

C549S249000

Reexamination Certificate

active

07371893

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 V2O5, to antimony, calculated as Sb2O3, 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 μm. The process allows the desired oxidation products to be obtained in high yield over longer periods of time.

REFERENCES:
patent: 4356112 (1982-10-01), Nakanishi et al.
patent: 4855457 (1989-08-01), Ramzi et al.
patent: 5235071 (1993-08-01), Ueda et al.
patent: 5969160 (1999-10-01), Lindström
patent: 6586361 (2003-07-01), Heidemann et al.
patent: 2005 969 (1971-08-01), None
patent: 0 163 231 (1985-12-01), None
patent: 0 522 871 (1993-01-01), None
patent: 0 539 878 (1993-05-01), None
patent: 0 676 400 (1995-10-01), None
patent: 1 063 222 (2000-12-01), None

Affiliated with

Also associated with

Rating

Production of aldehydes, carboxylic acids and/or carboxylic... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Production of aldehydes, carboxylic acids and/or carboxylic..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Production of aldehydes, carboxylic acids and/or carboxylic... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2799720