INTEGRATED METHOD FOR PRODUCING ACROLEIN AND 3-METHYLMERCAPTO PROPIONALDEHYDE

Method for producing MMP from acrolein and methyl mercaptan in which the following steps are performed sequentially: A) Gas phase oxidation of propylene using air over a heterogeneous catalyst in the presence of a diluting gas B) Collecting the gas flow containing acrolein from A) in a quenching stage to separate out the by-products C) Recovering residual acrolein from the liquid found in the lower section of the quenching stage B) by stripping D) Collecting a first portion of the gas flow containing acrolein from the quenching stage B) in an absorption stage in the presence of water to obtain an aqueous acrolein solution 01) At least partial return of the non-condensable gas from D) into the reaction stage A) as a diluting gas E) Separation by distillation of the acrolein from the aqueous acrolein solution from D) in a distillation stage E1) Condensation of the distillate containing acrolein from E) and feeding of said distillate into a reaction stage F) and feeding of a further portion of the gas flow containing acrolein from the quenching stage B) directly into the reaction stage F) for reaction with methyl mercaptan in the presence of MMP and/or MMP/MC hemithioacetal.