Production of unsaturated acids or esters thereof and...

Details Production of unsaturated acids or esters thereof and... Production of unsaturated acids or esters thereof and...

B - Operations, Transporting

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B01J 21/00 (2006.01) B01J 32/00 (2006.01) B01J 35/10 (2006.01) B01J 37/02 (2006.01) C07C 51/347 (2006.01) C07C 51/353 (2006.01) C07C 67/343 (2006.01) C07C 67/347 (2006.01) C07C 69/54 (2006.01)

Patent

CA 2326778

The production of ethylenically unsaturated acids or esters by the catalytic reaction of an alkanoic acid or ester, especially methyl propionate, with formaldehyde, and a catalyst therefor wherein the catalyst comprises a porous high surface area silica containing 1-10 % by weight of an alkali metal, especially cesium, (expressed as metal) and having compounds of at least one modifier element selected from boron, magnesium, aluminium, zirconium and hafnium dispersed in the pores of said silica in such amount that the catalyst contains a total of 0.25 to 2 gram atoms of primary modifier element per 100 moles of silica.

L'invention concerne la production d'acides ou d'esters éthyléniquement insaturés, par réaction catalytique d'un acide ou ester alcanoïque, notamment du propionate de méthyle, avec du formaldéhyde, de même qu'un catalyseur conçu à cet effet et comprenant une silice poreuse à surface utile importante contenant 1 à 10 % en poids d'un métal alcalin, notamment du césium, (exprimé en tant que métal) et possédant des composés d'au moins un élément modificateur choisi dans le groupe constitué par le bore, le magnésium, l'aluminium, le zirconium et le hafnium, dispersés dans le pores de cette silice dans une quantité telle que le catalyseur contient un total de 0,25 à 2 atomes-grammes d'élément modificateur primaire par 100 moles de silice.

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