Patent ID: 6051736
Filing Date: 2000-04-18
Classification: C07C

Abstract:
A process for preparing (meth)acrylic acid comprising:a) preparing a gas comprising (meth)acrylic acid, water, oxygen and at least one of an alkane, an alkanol, an alkene or an alkenal of 3 or 4 carbon atoms;b) condensing said gas to obtain:i) a first aqueous solution comprising (meth)acrylic acid; andii) a first gas phase;c) contacting said first gas phase with fresh water to form a second aqueous solution and a second gas phase; andd) extracting said second aqueous solution with an extraction solution which comprises at least one of an alkane, an alkanol, an alkene or an alkenal of 3 to 4 carbon atoms and which forms a miscibility gap with said second aqueous solution to form an organic phase comprising (meth)acrylic acid and a third aqueous phase.