BigPatents India

An improved process for denitrochlorination of chlorofluoronitrobenzenes to 2,4-dichlorofluorobenzenes by reacting chlorofluornonitrobenzenes with chlorine into bubble column reactor, distilling at a temperature in the range of 150-240oC, at a flow rate of chlorine in the range of 40-120cc/min, at a flow rate of chlorofluoronitrobenzenes in the range of 5-45 g/h, for a period in the rang of 150-400 seconds, optionally adding a quarternary ammonium salt washing the condensate obtained by water and alkali till pH of the condensate is neutralized, drying the layer to obtain the desired pure 2,4-dichlorofluorobenzenes.