Production of unsaturated acids or esters thereof
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United States of America Patent
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May 30, 2006
Grant Date -
Dec 18, 2003
app pub date -
Jan 17, 2003
filing date -
Apr 8, 1998
priority date (Note) -
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Abstract
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 a 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.
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