Process for preparing monochloroacetic acid

Details Process for preparing monochloroacetic acid Process for preparing monochloroacetic acid

2006-04-18

2006-04-18

Zucker, Paul A. (Department: 1621)

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

Organic compounds

Carboxylic acids and salts thereof

Reexamination Certificate

active

07030270

ABSTRACT:
The invention relates to a process for preparing monochloroacetic acid (MCA) comprising a chlorination step and a hydrogenation step and is characterized in that said process comprises the removal of aldehydes from a process stream by oxidation using a peroxycarboxylic acid. A preferred peroxycarboxylic acid comprises peracetic acid. Preferably, the process is carried out at a temperature of 60–100° C., most preferably at atmospheric pressure. Preferably, an about equimolar amount of peroxycarboxylic acid is used relative to the molar amount of aldehydes present in the process stream. A practical choice for the process stream is the acetic acid recycle stream. The invention process provides a clear and colourless MCA end product.

REFERENCES:
patent: 3393235 (1968-07-01), Boullay
patent: 5756840 (1998-05-01), Ebmeyer et al.
patent: 1411214 (1975-10-01), None
patent: 1 456 057 (1976-11-01), None
patent: A 4-338357 (1992-11-01), None
patent: A 8-231465 (1996-09-01), None

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