Patent ID: 7825061
Filing Date: 2010-11-02
Classification: B01J,C07C

Abstract:
1. A method for preparing a catalyst for producing methacrylic acid by subjecting methacrolein, isobutylaldehyde or isobutyric acid to gas phase catalytic oxidation, the method comprising: step (A) of blending compounds A-1 to A-3 and, as needed, compound A-4 with water to prepare an aqueous solution or dispersion of the compounds (hereinafter, called a slurry, including both), wherein the compound A-1 is a compound containing Mo, a compound containing V, a compound containing P, and a compound containing Cu, the compound A-2 is cesium acetate or cesium hydroxide, the compound A-3 is ammonium acetate, and the compound A-4 is one or more compounds selected from the group consisting of compounds containing one of Sb, As, Ag, Mg, Zn, Al, B, Ge, Sn, Pb, Ti, Zr, Cr, Re, Bi, W, Fe, Co, Ni, Ce, Th, K and Rb; and step (B) of drying the slurry yielded in step (A) to obtain a dried slurry.