HCl and other corrosive gases are widely used in all kinds of chemical synthetic raw materials. Due to its corrosivity after containing water, it will corrode the equipment and cause side reactions. In many cases, the moisture content is required to be 10 ~ 200ppm. The device has the following characteristics: deep vacuum regeneration, low water content of product, external circulating cooling, built-in thermal super tube for heating, which can greatly reduce nitrogen consumption, and the system is fully automatic and programmed.