Production of acrolein and acrylic acid by heterogeneous catalyzed gas phase oxidation of propane

摘要

A novel method of producing acrolein and/or acrylic acid by heterogeneous catalyzed gas phase oxidation of propane, by using two consecutive, stationary beds of catalysts based on different multimetal oxides, and a starting gas mixture containing /- 50 vol.% propane, /- 15 vol.% oxygen and 0 - 35 vol.% inert gas. A mixture of propane, oxygen and optionally inert gas is passed over two stationary catalyst beds at 300 - 500 deg C. The beds are based on different multimetal oxides (A and B) are used. The starting gas mixture contains /- 50 vol.% propane, /- 15 vol.% oxygen and 0 - 35 vol.% inert gas is passed through the catalyst bed A and then B. The active material of the catalyst beds is multimetal oxide(s) of formula (I) in bed A and multimetal oxide(s) of formula (II) in bed B; M<1>aMo1-bM<2>bOx (I) Bia'Mob'X<1>c'X<2>d'X<3>e'X<4>f'X<5>g'X<6>h'Ox' (II) M<1> = cobalt (Co), nickel (Ni), magnesium (Mg), zinc (Zn), manganese (Mn), copper (Cu) and/or tin (Sn); M<2> = tungsten (W), vanadium (V), tellurium (Te), niobium (Nb), phosphorus (P), chromium (Cr), iron (Fe), antimony (Sb), cerium (Ce) and/or lanthanum (La); X<1> = W, V and/or Te; X<2> = alkaline earth metal, Co, Ni, Zn, Mn, Cu, cadmium (Cd), Sn and/or mercury (Hg); X<3> = Fe, Cr and/or Ce; X<4> = P, arsenic (As), Sb and/or boron (B); X<5> = alkali metal, thallium (Tl) and/or Sn; X<6> = a rare earth metal, titanium (Ti), zirconium (Zr), Nb, tantalum (Ta), rhenium (Re), ruthenium (Ru), rhodium (Rh), silver (Ag), gold (Au), aluminum (Al), gallium (In), silicon (Si), germanium (Ge), thorium (Th) and/or uranium (U); a = 0.5 - 1.5; b = 0 - 0.5; a' = 0.01 - 8; b' = 0.1 - 30; c' = 0.1 - 20; d', e' = 0 - 20; f' = 0 - 6; g' = 0 - 4; h' = 0 - 15; x, x' = a number, depending on the valency and content of elements other than oxygen.