| 摘要 |
PURPOSE:To produce an alpha, beta-unsaturated carboxylic acid in high yield by adding steam to a raw material gas in catalytically oxidizing an aliphatic saturated hydrocarbon in vapor phase in the presence of a compound metal oxide catalyst. CONSTITUTION:In producing an alpha, beta-unsaturated carboxylic acid by catalytically oxidinzing a 3-8C aliphatic saturated hydrocarbon in a vapor phase in the presence of a compound metal oxide catalyst, a gas comprising an aliphatic saturated hydrocarbon, steam and an oxygen-containing gas in the molar ratio of hydrocarbon:oxygen:a diluting gas:H2O=1:(0.1-10.0):0-20:(0.2-70) is used as a raw material gas and one or more of (i) Mo, V, Te, >=1 kind metal selected from among X<1> and oxygen, (ii) Bi, No, >=1 kind metal selected from among X<2> and oxygen, (iii) V, >=1 kind metal selected from among X<3> and oxygen and (ir)Fe, >=1 kind metal selected from among X<4> and oxygen as essential components are used as the compound metal oxide catalyst. Especially the component (i) is preferable. X<1>:Nb, Ta, W, Ti, Al, Zr, Cr, Mn, Fe, Ru, Co, Rk, Ni, Pd, Pt, Sb, Bi, B, In, Cs;X<2>: V, Nb, Tl, W, Ti, Al, Zr, Cr, Mn, Fe, Ru, Co, Rh, Ni, Pd, Pt, Sb, P, B, Pb, Ga, In, Ce, Li, Na, K, Rb, Cs, Tl, Cu, Ag; X<3>: Fe, Sb, P, Li, Na, K, Rb, Cs, W, Ti, Al, Zr, Sn, Ge, In; X<4>: Sb, P, Cr, Ti, Mo, Al, Zr, Sn, Ge, In. |
