To obtain the subject pure compound by selectively hydrogenating dichloroacetic acid for economically removing dichloroacetic acid from a mixture of mono- and dichloroacetic acids.
This pure monochloroacetic acid is obtained by performing the hydrogenation reaction of a mixture of mono- and dichloroacetic acids as a first step by using a heterogeneous catalyst containing preferably 0.1-5.0wt.% Pd, especially preferably 0.3-4.0wt.% Pd, and an active carbon or silicon dioxide as a carrier so as to attain 400-600ppm residual dichloroacetic acid content and a melting crystallization treatment of this mixture as a second step. Further, it is preferable to perform the above hydrogenation reaction preferably under 0-10 bar pressure, more preferably 0-4 bar, and preferably at 100-200°C temperature, more preferably 110-150°C. Also, as the raw material mixture, it is preferable to contain 1-50wt.% dichloroacetic acid content, more preferably 20-50wt.%.
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