PRODUCTION OF METHACRYLIC ACID

摘要

PURPOSE:To provide a process for producing methacrylic acid effective in suppressing the by-production of diketones and enabling the production of high- quality methacrylic acid having extremely low diketone content. CONSTITUTION:Methacrylic acid is produced by introducing methacrolein and/or isobutylaldehyde together with molecular oxygen into a heat-exchange multitube reactor packed with an oxide catalyst containing molybdenum and phosphorus to effect catalytic vapor-phase oxidation reaction and/or catalytic vapor-phase oxidative dehydrogenation reaction. In the above process, the gas discharged from the catalyst layer of the reaction is quenched to <=300 deg.C.