Patent ID: 6025523
Filing Date: 2000-02-15
Classification: B01J,C07C

Abstract:
A process for the manufacture of acrylic acid from acrolein, according to the redox reaction (1):SOLID.sub.oxidized +ACROLEIN.fwdarw.SOLID.sub.reduced +ACRYLIC ACID(1),said process comprising passing a gaseous mixture of acrolein and of water vapour and optionally of an inert gas over a solid composition of formula (I):Mo.sub.12 V.sub.a Sr.sub.b W.sub.c Cu.sub.d Si.sub.e O.sub.x(I)in which:a is between 2 and 14,inclusive,b is between 0.1 and 6,inclusive,c is between 0 and 12,inclusive,d is between 0 and 6,inclusive,e is between 0 and 15,inclusive,x is the quanity of oxygen bonded to the other elements and depends on their oxidation state,the said solid composition reacting with the acrolein at a temperature of 200 to 500.degree. C., at a pressure of 1.01.times.10.sup.4 to 1.01.times.10.sup.6 Pa (0.1 to 10 atmospheres) and with a residence time of 0.01 second to 90 seconds, in the substantial absence of molecular oxygen.