| abstract |
A production process of (meth) acrylic acids, which is a process for the production of (meth) acrylic acid or (meth) acrylic acids, by a reaction step comprising catalytic oxidation in the vapor phase of propylene, propane or isobutylene, characterized because at the time that a mixture of boiling point containing a Michael addition product is decomposed in a decomposition reactor to recover (meth) acrylic acids, while a flow of liquid in the circumferential direction is necessarily incorporated into a liquid reaction residue in the decomposition reactor, the liquid reaction residue is eliminated, in which the flow of the liquid in the circumferential direction is incorporated by a liquid supplied from outside the decomposition reactor. |