PROCESS FOR PRODUCTION OF ACRYLIC ACID VIA HETEROGENEOUSLY CATALYZED PARTIAL OXIDATION OF PROPANE Russian patent published in 2007 - IPC C07C51/215 C07C57/05 

FIELD: industrial organic synthesis.

SUBSTANCE: invention relates to improved process to produce acrylic acid via heterogeneously catalyzed gas-phase partial oxidation of propane wherein starting reactive gas mixture containing propane, molecular oxygen, and at least one gas diluent is passed at elevated temperature over a multimetal oxide bulk depicted by total stoichiometry as Mo₁V_bM¹ _сM² _вO_n (I), in which M¹ = Te and/or Sb and M² is at least one element from group comprising Nb, Ta, W, Ti, Al, Zr, Cr, Mn, Ga, Fe, Ru, Co, Rh, Ni, Pd, Pt, La, Bi, B, Ce, Zn, Si, and In; b = 0.01 to 1, c = >0 to 1, d = >0 to 1, and n = number, which is determined by valence and number of non-oxygen elements in (I). Propane is partially oxidized to produce acrylic acid in a process wherein composition of starting reaction mixture is at least two times varied in the course of process such that molar percentage of gas diluent (water steam) in starting reaction gas mixture decreases relative to molar percentage of propane contained in starting gas mixture.

EFFECT: reduced amount of water steam in gas mixture without loss in selectivity and activity of catalyst regarding target product.

5 cl, 1 dwg, 10 ex