Method and device for purifying 1,4-bis (bromodifluoromethyl) benzene

Abstract

A method and a device for purifying 1,4-bis (bromodifluoromethyl) benzene are disclosed. In order to solve the problem of hard to purify and separate 1,4-bis (bromodifluoromethyl) benzene crude products, diphenylmethane that has a higher boiling point and does not interact with 1,4-bis (bromodifluoromethyl) benzene is mixed with the 1,4-bis (bromodifluoromethyl) benzene crude products for evaporation. Afterwards, the purity of the vaporized product is detected and only that reaching an expected purity is collected to obtain high-purity 1,4-bis (bromodifluoromethyl) benzene.

1 . A device for purifying 1,4-bis (bromodifluoromethyl) benzene, comprising:
 a flask, which is used to accommodate a mixture of 1,4-bis (bromodifluoromethyl) benzene crude products with diphenylmethane;   a heater, which provides heat to evaporate the mixture into a vapor;   a column, which is connected to the opening of the flask and contains a condenser and a dripping device; wherein the condenser condensates the vapor to obtain an evaporate liquid, and the dripping device guides the evaporate liquid to flow out; and   a collecting cup, which collects the evaporate liquid to obtain an evaporate product.   
   
   
       2 . The device for purifying 1,4-bis (bromodifluoromethyl) benzene of  claim 1  further comprising a temperature controller and a temperature recorder to control and record the temperature. 
   
   
       3 . The device for purifying 1,4-bis (bromodifluoromethyl) benzene of  claim 1 , wherein the column is filled with Rasching ceramics as the evaporation plate.