PROCESS FOR PREPARING ACRYLIC ACID USING AN ALKALI METAL-FREE AND ALKALINE EARTH METAL-FREE ZEOLITIC MATERIAL

摘要

A process for preparing acrylic acid, comprising (i) providing a stream S4 comprising a formaldehyde source and acetic acid; (ii) contacting stream S4 with an aldol condensation catalyst comprising a zeolitic material comprising aluminum in the framework structure to obtain a stream S6 comprising acrylic acid, the framework structure of the zeolitic material in (ii) comprising YO2 and Al2O3, and Y being a tetravalent element; where the total content of alkali metal and alkaline earth metal in the zeolitic material in (ii), calculated as alkali metal oxide and alkaline earth metal oxide, is from 0% to 0.1% by weight, based in each case on the total weight of the zeolitic material, and where the aldol condensation catalyst in (ii) comprises, outside the framework structure of the zeolitic material present therein, from 0% to 1% by weight of vanadium, based on vanadium as vanadium(V) oxide.

主权项

1. A process for preparing acrylic acid, the process comprising
contacting a stream S4 comprising a formaldehyde source and acetic acid with an aldol condensation catalyst comprising a zeolitic material having a framework structure comprising aluminum to obtain a stream S6 comprising acrylic acid, wherein the framework structure of the zeolitic material comprises YO2 and Al2O3, wherein Y is a tetravalent element; a total content of alkali metal and alkaline earth metal in the zeolitic material, calculated as alkali metal oxide (M2O) and alkaline earth metal oxide (MO), is from 0% to 0.1% by weight, based on a total weight of the zeolitic material, and the aldol condensation catalyst in further comprises from 0% to 1% by weight of vanadium, calculated as vanadium(V) oxide and based on a total weight of the aldol condensation catalyst.