Patent ID: 7348455
Filing Date: 2008-03-25
Classification: B01D,B01J,C07C

Abstract:
1. A process for producing (meth)acrylic acids, comprising: decomposing in a decomposition reactor a high boiling mixture formed as a byproduct during the production of (meth)acrylic acids, forcibly imparting a liquid flow in the circumferential direction to a liquid reaction residue in the decomposition reactor; recovering (meth)acrylic acid or a (meth)acrylic acid ester; and discharging the liquid reaction residue; wherein the high boiling mixture contains a Michael addition product having water, an alcohol or (meth)acrylic acid added to a (meth)acryloyl group, and the decomposition reactor comprises a liquid level meter wherein a high pressure side detection line of the liquid level meter is connected to a liquid discharge line of the decomposition reactor.