| 摘要 |
PROBLEM TO BE SOLVED: To obtain the subject compound useful as a raw material for synthetic resins, coating materials, plasticizers, etc., in high selectivity by vapor phase catalytic oxidation of the corresponding alkane under limitations of its concentration and conversion and the reaction gas composition ratio within respective specified ranges. SOLUTION: (A) A 3-8C aliphatic saturated hydrocarbon is subjected to vapor phase catalytic oxidation in the presence of (B) a multiple metal oxide catalyst under such controlled conditions that the concentration of the component A in the feedstock gases is 4-90vol.% the composition ratio of the reaction gases to be fed into the reaction vessel is 1:(0.1-1.9):0-20, and the conversion of the component A is <=70%. It is preferably that, after (C) the objective α,β-unsaturated carboxylic acid in the stream discharged from the reaction vessel is separated, a gas containing the unreacted component A is fed to the reaction vessel again; thereby improving the yield of the objective unsaturated carboxylic acid C. |
