Process and catalyst for the preparation of methacrylic acid

US4925823A · kind A · utility

Assignee

• BASF SE

Inventors

• Richard Krabetz · Tauberbischofsheim, DE
• Gerd Duembgen · Schifferstadt, DE
• Friedbert Nees · Blankenloch, DE
• Franz Merger · Bischofswerda, DE
• Gerd Fouquet · Neustadt, DE

Key dates

• Filing date: Jun 19, 1986
• Grant date: May 15, 1990
• Expiry date: Jun 19, 2006

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C51/235
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Oxidation catalysts of the general formula EQU Mo.sub.12 P.sub.a W.sub.b Sb.sub.c As.sub.d Cu.sub.e X.sub.f O.sub.x where PA1 X is Nb, Fe, Mn, Sn and/or Cr, PA1 a is 0.1-3, PA1 b is 0.1-4, PA1 c is <0-2, PA1 d is 0-1, PA1 e is 0-1, PA1 d+e is <0-2, PA1 f is 0-1.5, PA1 e+f is 0-2 and PA1 x is the number of oxygen atoms formally required to saturate the valencies of the other catalyst components, may be used particularly advantageously for the preparation of methacrylic acid by gas phase oxidation of methacrolein.