PROCESS FOR PREPARING V-Ti-P CATALYSTS FOR SYNTHESIS OF 2,3-UNSATURATED CARBOXYLIC ACIDS

摘要

The invention relates to a catalyst composition comprising a mixed oxide of vanadium, titanium, and phosphorus. The titanium component is derived from a water-soluble, redox-active organo-titanium compound. The catalyst composition is highly effective at facilitating the vapor-phase condensation of formaldehyde with acetic acid to generate acrylic acid, particularly using an industrially relevant aqueous liquid feed. Additionally, the catalyst composition is catalytically active towards the formation of acrylic acid from methylene diacetate and methacrylic acid from methylene dipropionate; both reactions are carried out with high space time yields.

主权项

1. A process for preparing a 2,3-unsaturated carboxylic acid comprising:
contacting a formaldehyde source, a carboxylic acid, and a diluent gas with a condensation catalyst under vapor-phase condensation conditions to obtain the 2,3-unsaturated carboxylic acid; wherein the condensation catalyst comprises a mixed oxide of vanadium (V), titanium (Ti), and phosphorus (P); wherein the diluent gas comprises from about 3 mol % to about 5 mol % oxygen, based on the total moles of feed; and wherein the process has a selectivity of greater than about 40% and a conversion of greater than about 40%.