Production process of ethyl difluorobromoacetate

The invention discloses a preparation process of ethyl bromodifluoroacetate. The method uses trifluorovinyl ether as a raw material, and comprises the following steps: carrying out addition on R-trifluorovinyl ether and bromine at low temperature to generate a dibromo product; reacting the dibromo product with chlorosulfonic acid to generate difluorobromoacetyl chloride; and reacting the difluorobromoacetyl chloride with ethanol to obtain the ethyl difluorobromoacetate. Halogenated alkane which destroys the ozone layer is not adopted as the raw material, and meanwhile, a high-toxicity mercury-containing catalyst is avoided. 本发明公开了一种二氟溴乙酸乙酯的制备工艺，该方法也三氟乙烯基乙醚为原料，包括如下步骤：R-三氟乙烯基醚先与溴素在低温下加成生成二溴产物；二溴产物再与氯磺酸反应生成二氟溴乙酰氯；二氟溴乙酰氯与乙醇反应得到二氟溴乙酸乙酯。本发明原料未采用破坏臭氧层的卤代烷烃，同时避免使用高毒的含汞催化剂。