Production of unsaturated acids or esters thereof

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

2006-05-30

2006-05-30

Johnson, Edward M. (Department: 1754)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

Reexamination Certificate

active

07053147

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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patent: 0227461 (1987-07-01), None
Yoo, J.S., “Silica supported metal-doped cesium ion catalyst for methacrylic acid synthesis via condensation of propionic acid with formaldehyde,” Applied Catalysis A: General, 1993, 102, pp. 215-232.

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