Process for preparation of alpha, beta-unsaturated acids

Details Process for preparation of alpha, beta-unsaturated acids Process for preparation of alpha, beta-unsaturated acids

1987-07-27

1991-02-05

Garner, Vivian

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acids and salts thereof

2604055, 562400, 562405, 562495, 562503, 562504, 562510, C07C 51353, C07C 51377, C07C 5704, C07C 5726, C07C 5742

Patent

active

049906623

ABSTRACT:
Catalyst and process are disclosed for the improved preparation of alpha, beta-unsaturated acids. The catalyst comprises a porous silica gel component and a Group IA alkali metal component, which is present in an amount of from 200 to 20,000 parts per million and optionally another component such as tin (IV) oxide, and mixtures thereof. The process comprises reacting formaldehyde and an aliphatic carboxylic acid in the presence of said catalyst while maintaining catalyst activity and selectivity during the process by addition of a source of the alkali metal component.

REFERENCES:
patent: 3840587 (1974-10-01), Pearson
patent: 4361264 (1986-12-01), Hagen

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