The conditions for the distillation of dichloromethane, flow of 1.6t-2t / h, using heat transfer area of ​​9.8 square SECESPOL heat exchanger, in the spring, autumn, winter use of recycled water as a cooling medium, using frozen salt water as the summer two condensation, through the use of more than a year, saving the company frozen brine preparation for the cost of 50 million, methylene chloride and cooling the temperature of cooling water inlet temperature within the temperature at 3 degrees, the user satisfaction.