Process for the preparation of unsaturated aliphatic carboxylic

Details Process for the preparation of unsaturated aliphatic carboxylic Process for the preparation of unsaturated aliphatic carboxylic

1982-05-19

1985-03-05

Waltz, Thomas A.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260413, 562518, 562598, 562601, 560185, C11C 104, C07C 5100

Patent

active

045029938

ABSTRACT:
The invention relates to a process for the preparation of unsaturated aliphatic carboxylic acids by thermal cracking of the polymeric intermediate product ("polyester") which is formed in the catalytic reaction of aldehydes or ketones with ketene. The reaction mixture containing polyester is heated with water, and the polyester is then isolated and subjected to cracking. Or the polyester is first isolated and then heated with water and finally subjected to cracking. In both cases the temperature when the mixture is heated with water is the same as the boiling point, or is less than 40.degree. C. below the boiling point, of the aqueous mixture.

REFERENCES:
patent: 3021365 (1962-02-01), Fernholz et al.
patent: 3960939 (1976-06-01), Sekiyama et al.

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