Patent ID: 6660681
Filing Date: 2003-12-09
Classification: B01J,C07C

Abstract:
A process for preparing a catalyst comprising vanadium phosphorus oxide combined with a thermally conductive material, comprising the steps of:a) forming a suspension comprising a vanadium (IV) phosphate compound in a liquid medium; b) adding a thermally conductive material to the suspension under agitation at a temperature between 40Â° C. and 120Â° C. to provide vanadium (IV) phosphate combined with the thermally conductive material; c) drying the vanadium (IV) phosphate/thermally conductive material; d) optionally washing the dried vanadium (IV) phosphate/thermally conductive material with water; and e) calcining the vanadium (IV) phosphate/thermally conductive material either in situ or ex situ at elevated temperature to obtain a catalyst comprising vanadium phosphorus oxide combined with a thermally conductive material, wherein forming the suspension comprising a vanadium (IV) phosphate compound in a liquid medium comprises heating vanadium pentoxide with at least one substantially anhydrous unsubstituted alcohol having 1-10 carbon atoms, 1-3 hydroxyl groups and free from olefinic double bonds to form a feed of vanadium pentoxide reduced to a valence between 4 and 4.6, and then contacting the feed with a solution of orthophosphoric acid and at least one substantially anhydrous unsubstituted alcohol having 1-10 carbon atoms, 1-3 hydroxyl groups and free from olefinic double bonds.