Patent ID: 6407287
Filing Date: 2002-06-18
Classification: C07C

Abstract:
A method for the production of acrylic acid, comprising a step of subjecting propylene and/or acrolein to a reaction of catalytic gas phase oxidation, a step of absorbing the acrylic acid contained in the gas formed by said reaction of catalytic gas phase oxidation with a absorbent, and a step of dehydrating the acrylic acid-containing aqueous solution obtained by said step of absorption, and characterized by said step of dehydration adding an azeotropic solvent capable of forming an azeotropic mixture with acetic acid and water and distilling the resultant mixture and adjusting the acrylic acid concentration at the top of said azeotropic dehydration column in the range of 0.06-0.80 wt. % thereby preventing the bottoms of said azeotropic dehydration column from substantially containing said azeotropic solvent and water.