In the generation method of the carboxylic acid which uses two phaseless catalytic converter vapor phase oxidation of two phaseless process null

摘要

A method for producing an alpha beta unsaturated carboxylic acid at high yields at low temperatures and atmospheric pressure has two steps for catalytic gas phase oxidation of olefins by oxygen in the molecule. In the first step, the olefin is a chemical formula, one or more of X1 = Co, Ni, V, Pt, Rh; one of x2 = Al, GA, Ge, Mn, Nb, Zn, Ag, P, Si, W; X3 = k, Mg, Rb, CA The catalyst a is oxidized using at least one of Sr, Ba, Na, and o = oxygen. In the second stage, the alpha beta unsaturated aldehyde in the first stage product is at least one of the chemical formulas x = w or Mn or Y; y = PD, Sb, CA, P, GA, Ge, Si, Mg, Nb, K; and o It is oxidized using a catalyst B having a composition by an oxygen that satisfies the valence of other elements; it is mainly oxidized to produce an alpha beta unsaturated carboxylic acid. The first part of oxygen isIt is introduced into the reaction stream between the second and the second stage or at multiple stages. The present invention more particularly relates to a two-step process for catalytic oxidation of propylene or isobutylene for the generation of acrylic acid or methacrylic acid.