초록

According to the present invention, the generation of hot spot can be avoided and over oxidation reaction can be avoided and the acrolein and acrylic acid are produced constantly for a prolonged period of time.

대표청구항 ▼

[ What is claimed is:] [1.] A method for producing acrolein and acrylic acid by carryingout vapor phase catalytic oxidation of propylene with molecular oxygen or a gas containing molecular oxygen using oxidation catalysts comprising Mo, Bi and Fe as an element and a fixed bed multitubular reactor, w

[ What is claimed is:] [1.] A method for producing acrolein and acrylic acid by carryingout vapor phase catalytic oxidation of propylene with molecular oxygen or a gas containing molecular oxygen using oxidation catalysts comprising Mo, Bi and Fe as an element and a fixed bed multitubular reactor, which comprisesa) using a plurality of supported catalysts having different activities depending on an amount of catalyst supported on a carrier,b) setting a plurality of catalyst layers within a reaction tube, which is formed by dividing it into plural portions in the tube axial direction, andc) arranging the catalyst layers in such order that the activity of the catalyst in each said layer becomes high toward the outlet from the inlet of the material gas in the reaction tube axial direction.