| 摘要 |
<p>A process for producing (meth)acrylic acid or a (meth)acrylic acid derivative which comprises a reaction step comprising the vapor-phase catalytic oxidation of propylene, propane, or isobutylene and optionally further includes a reaction step comprising esterification and in which a mixture having high boiling points (hereinafter referred to as high-boiling mixture) containing a Michael addition product is decomposed with a pyrolysis reactor to recover the (meth)acrylic acid compound, characterized in that the liquid reaction mixture residue present in the pyrolysis reactor is discharged while forcibly causing a circumferential-direction flow in the liquid reaction mixture residue within the pyrolysis reactor. In the method in which a high-boiling mixture containing a product of Michael addition of a (meth)acrylic acid compound is pyrolyzed to recover a valuable substance, the residue resulting from the pyrolysis can be fed from the pyrolysis reactor to a storage tank without causing clogging. A long-term continuous operation is hence possible.</p> |
