Method for production of acrylic acid
AssigneeNippon Shokubai Kagaku Kogyo Co., Ltd.
InventorsTatsuya Kawajiri, Shinichi Uchida, Hideyuki Hironaka
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Abstract
A method for the production of acrylic acid by the vapor-phase oxidation of acrolein with a molecular oxygen-containing gas in the presence of a catalyst formed of an oxide or a composite oxide of a metal element composition represented by the following formula I: Mo.sub.a V.sub.b W.sub.c Cu.sub.d X.sub.e Y.sub.f (I) wherein X is at least one element selected from the group consisting of Zr, Ti and Ce, Y is at least one element selected from the group consisting of Mg, Ca, Sr and Ba, and the subscripts a, b, c, d, e, and f are such that b=1 to 14, 0<c.ltoreq.12, 0<d.ltoreq.6, 0<e.ltoreq.10, and f=0 to 3 where a is fixed at 12, 2.0<Cu+X.ltoreq.10.0 and 0.25.ltoreq.Cu/X.ltoreq.6.0.
Claims12
A method for the production of acrylic acid by the vapor-phase oxidation of acrolein with a molecular oxygen-containing gas in the presence of a catalyst formed of an oxide or a composite oxide of a metal element composition represented by the following formula I:
- Mo.sub.a V.sub.b W.sub.c Cu.sub.d X.sub.e Y.sub.f (I)
- wherein Mo is molybdenum, V is vanadium, W is tungsten, Cu is copper, X is at least one element selected from the group consisting of zirconium and titanium, Y is at least one element selected from the group consisting of magnesium, calcium, strontium, and barium, and the subscripts a, b, c, d, e, and f are such that b=1 to 14, 0<c.ltoreq.12, 0<d.ltoreq.6, 0<e.ltoreq.10, and f=0 to 3 when a is 12;
- 2.0<Cu+X.ltoreq.10.0 and 0.25.ltoreq.Cu/X.ltoreq.6.0.
Dependencies are inferred from the claim text.