Preparation of methacrylic acid and catalyst therefor

US4595778A · kind A · utility

Assignee

• BASF SE

Inventors

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

Key dates

• Filing date: Mar 7, 1984
• Grant date: Jun 17, 1986
• Expiry date: Mar 7, 2004

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S203/22
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Oxidation catalysts of the general formula EQU W.sub.6 Mo.sub.a V.sub.b P.sub.c Cu.sub.d As.sub.e Sb.sub.f X.sub.g Y.sub.h O.sub.x where X is K, Rb and/or Cs, Y is Nb, Fe, Mn, Sn, Li, Na, Sr, Rh, Ce, Ti and/or Cr, a is from 2.0 to 6, b is from 0 to 3, c is from 0.1 to 3, d is from 0.01 to 1, e is from 0 to 1, f is from 0 to 2, g is from 0.01 to 3, h is from 0 to 1 and x is the number of oxygen atoms formally required to saturate the valencies of the catalyst components, give high conversions and particularly high selectivity in the oxidation of methacrolein in the gas phase to methacrylic acid.