METHOD FOR PRODUCTION OF UNSATURATED ACIDS OR THEIR ESTERS AND APPROPRIATE CATALYSTS Russian patent published in 2003 - IPC

FIELD: industrial organic synthesis. SUBSTANCE: ethylenically unsaturated acids or their esters are prepared via catalytic reaction of alkane acid or its ester, especially methyl propionate, with formaldehyde in presence of catalyst, in particular porous high-specific surface silica containing 1 to 10 wt % alkali metal, especially cesium, and compounds of at least one modifying element selected from boron, magnesium, aluminum, zirconium, and haffnium dispersed in silica pores in such an amount as to provide in catalyst 0.25 to 2 g-atoms of principal modifying element per 100 mole silica. EFFECT: prolonged lifetime of catalyst. 20 cl, 21 tbl, 63 ex