Process for the manufacture of alkyl acrylates by direct esterif

Details Process for the manufacture of alkyl acrylates by direct esterif Process for the manufacture of alkyl acrylates by direct esterif

1995-06-19

1997-08-19

Killos, Paul J.

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

Organic compounds

Carboxylic acid esters

C07C 6748

Patent

active

056590725

ABSTRACT:
An acrylic acid ester is manufactured by reaction of the said acid and an alcohol chosen from C.sub.5 or above primary and secondary aliphatic monoalcohols, in the presence of an acid as esterification catalyst and of a polymerization inhibitor, the alcohol being capable of forming a heteroazeotrope with water, the water formed by the esterification reaction being entrained by distillation in a column in the form of a heteroazeotropic mixture with the alcohol, which mixture, containing an amount of unreacted acrylic acid, is then subjected, after condensation, to a separation in order to give an upper organic phase which is recycled to the head of the distillation column and a lower aqueous phase which is withdrawn; according to the invention, an extraction (for example in an extraction column EC) of the acrylic acid contained in the condensed heteroazeotropic mixture (M) intended for phase separation with an esterifying-alcohol-rich mixture, and the acrylic acid thus extracted is returned to the head of the distillation column (DC), as a constituent of the recycled organic phase, with an increase in the level of reflux into the distillation column (DC) relative to the natural reflux.

REFERENCES:
patent: 4280009 (1981-07-01), Erpenbach et al.
patent: 4833267 (1989-05-01), Nakashima et al.

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