PROCESS FOR HYDRODECHLORINATION OF LIQUID FEED COMPRISING DICHLOROACETIC ACID Russian patent published in 2017 - IPC C07C51/377 C07C53/16 C07C51/487 

FIELD: chemistry.

SUBSTANCE: invention relates to a process wherein a liquid feed comprising monochloroacetic acid, dichloroacetic acid and optionally acetic acid and/or trichloroacetic acid, is subjected to a catalytic hydrodechlorination step by contacting it with a source of hydrogen to convert dichloroacetic acid into monochloroacetic acid in presence of a solid heterogeneous hydrogenation catalyst, comprising one or more metals of Group VIII of Periodic Table of Elements, deposited on a carrier, characterised in that said catalytic hydrodechlorination step is carried out in a vertical tubular reactor with a diameter exceeding 0.4 m, with solid heterogeneous hydrogenation catalyst being situated in a fixed catalyst bed, wherein liquid feed is fed to top of said vertical tubular reactor at a superficial mass velocity of between 1 and 10 kg/s per square meter of horizontal cross-section of vertical tubular reactor and a rate of between 250 and 3,000 kg/hr per m³ of said catalyst bed, wherein source of hydrogen is fed to top or bottom of vertical tubular reactor at a superficial gas velocity of between 0.025 to 0.25 Nm³/s per square meter of horizontal cross-section of vertical tubular reactor, so as to obtain an average axial pressure gradient of at least 2 kPa per meter of said catalyst bed, and wherein temperature in top of vertical tubular reactor is between 100 and 200 °C, and wherein pressure in top of vertical tubular reactor is between 0.2 and 1.0 MPa.

EFFECT: method achieves higher speed of mass transfer in combination with distribution of duration of stay, close to distribution mode ideal displacement and higher degree of conversion.

14 cl, 8 ex