Process for the preparation of a particularly pure monochloroace

Details Process for the preparation of a particularly pure monochloroace Process for the preparation of a particularly pure monochloroace

1996-12-11

1998-05-26

Barts, Samuel

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

Organic compounds

Carboxylic acids and salts thereof

C07C 5100

Patent

active

057568405

ABSTRACT:
The present invention relates to a process for the preparation of a particularly pure monochloroacetic acid, in which, in a first step, a hydrogenation of a mixture of mono- and dichloroacetic acid is carried out to a residual content of dichloroacetic acid of 400 to 600 ppm and, in a second step, this mixture is subjected to melt crystallization. The hydrogenation is carried out with a heterogeneous catalyst which comprises 0.1-5.0% by weight of palladium and in which active charcoal or silicon dioxide is used as the support.

REFERENCES:
patent: 5447542 (1995-09-01), Steiner et al.
Ullmann's Encyclopedia of Industrial Chemistry, 4th Ed., vol. 9, p. 395.
Ullmann's Encyclopedia of Industrial Chemistry, 1986 vol. 6, pp. 537, 539, 541, 552.

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