Patent ID: 6677482
Filing Date: 2004-01-13
Classification: B01D,B01J,C07C,Y02P

Abstract:
An apparatus for manufacturing (meth)acrylic acid for use in the method of manufacturing (meth)acrylic acid, the method comprising a reaction step, an absorbing step, and a refinement step, and further comprising a recirculation step of recirculating (meth)acrylic acid contained in a vent gas produced in the refinement step to the absorbing step and/or a later step, the apparatus comprising:a reactor for carrying out a catalytic gas-phase oxidation reaction; an absorbing column for absorbing (meth)acrylic acid from a (meth)acrylic-acid-containing mixed gas prepared in the reactor; devices, disposed downstream of the absorbing column, for separating, refining, and recovering (meth)acrylic acid from a (meth)acrylic-acid-containing liquid prepared in the absorbing column; and paths for recirculating (meth)acrylic acid contained in a vent gas produced in the devices for separating, refining, and recovering (meth)acrylic acid from a (meth)acrylic-acid-containing liquid prepared in the absorbing column to the absorbing column and/or a device for separating and refining (meth)acrylic acid among the devices disposed downstream of the absorbing column.