Fixed bed reactor for gas-phase catalytic oxidation and processes for producing acrolein or acrylic acid

Abstract

A fixed bed reactor including a reaction tube filled with a gas-phase oxidation catalyst, wherein a solid acid, of which acid strength (H0) meets an inequality: −5.6≦H0≦1.5, is placed in a gas passage containing a starting material compound and/or a produced compound; a process for producing acrolein, the process including using the above fixed bed reactor for production of acrolein by gas-phase catalytic oxidation of propylene with molecular oxygen; a process for producing acrylic acid, the process including using the above fixed bed reactor for production of acrolein by gas-phase catalytic oxidation of propylene with molecular oxygen and for subsequent production of acrylic acid by gas-phase catalytic oxidation of the acrolein with molecular oxygen; and a method for suppressing deposition of a catalyst inhibitor in a fixed bed reactor including a reaction tube filled with a gas-phase oxidation catalyst, the method including placing a solid acid, of which acid strength (H0) meets an inequality: −5.6≦H0≦1.5, in the fixed bed reactor for gas-phase catalytic oxidation.

Dependencies are inferred from the claim text.