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 methylene dialkanoate 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 methylene dialkanoate has the general formula (I):and
wherein R is selected from the group consisting of hydrogen and an alkyl group having 1 to 8 carbon atoms.