Prevention of post oxidation of methacrolein.

摘要

A method is disclosed for the prevention of post oxidation of methacrolein produced by vapor-phase oxidation of isobutylene, tertiary butanol or methallyl alcohol with a molecular-oxygen-containing gas in a reaction tube 3 containing a catalyst. The method comprising injecting at 5 and mixing with the reaction product gas, immediately downstream of the reaction tube outlet 4, a gas optionally mixed with air and selected from an inert gas, recirculated reaction gas and mixtures thereof.