MONOCHLOROACETIC ACID PRODUCTION PROCESS Russian patent published in 2005 - IPC

FIELD: industrial organic synthesis.

SUBSTANCE: two-stage process of production of monochloroacetic acid comprises acetyl chloride preparation stage and second stage wherein acetyl chloride is converted into desired product. Acetyl chloride is obtained via chlorination of acetic anhydride in continuous mode. Second stage is also carried out continuously in two steps involving recycling of acetyl chloride and acetic acid. Acetyl chloride is first chlorinated in UV activated chlorine flow in hydrodynamic mixing chamber to form nonochloroacetyl chloride. In the second step, nonochloroacetyl chloride recovered from reaction mixture is vaporized and fed into hydrodynamic mixing chamber to be mixed with 99.9% acetic acid. Resulting reaction mixture, containing monochloroacetic acid and acetyl chloride, is passed to heat exchanger at 80°C, wherein acetyl chloride is separated in thin layer from condensed monochloroacetic acid and returned to the first step.

EFFECT: increased productivity of process due to accelerated chlorination operation.

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