Patent ID: 8426335
Filing Date: 2013-04-23
Classification: B01J,C07C

Abstract:
1. A process for the production of acrylic acid comprising the steps of: a) drying a batch of a mixed liquid of starting materials including molybdenum and vanadium as essential components to give a dried material, wherein the step of drying said mixed liquid comprises the step of heating said mixed liquid at a temperature of not more than 230° C. for a heating period of less than 90 minutes; b) testing a portion of said dried material to determine whether an ignition loss ratio of said dried material is from 5 to 40% by mass; c) molding, after said step of testing, a portion of said dried material having an ignition loss ratio from 5 to 40% by mass with a liquid binder; d) calcining the resultant molding to produce a catalyst; and e) subjecting acrolein to a catalytic gas phase oxidation employing said catalyst in the presence of molecular oxygen to produce acrylic acid; with the proviso that the ignition loss ratio of the dried material is calculated according to the following formula based on masses of the dried material before and after heated, the dried material being heated until there is no mass change at 300° C. under air atmosphere: