Pharmaceutical Company in Henan Xiu vertical oil-free vacuum pump vacuum distillation of ethanol (four systems), the vacuum pump exhaust outlet together into a pipeline, and an increase in the piping of a condenser for the recovery of ethanol vapor in the exhaust , the use of 20/25 ℃ water for refrigerant condensing. Based on customer feedback, end of cold ethanol system, the maximum daily recycled 800kg, average per day recycled 600kg, condensate outlet temperature is very low, and the circulating water inlet temperature was less than 5 ℃, greatly improving the solvent recovery, only two months to recover the investment costs, and significantly reduce the environmental pressure.