Innovation and Development of Vertical Closed Circulation Dryer

Some synthetic drugs are usually crystallized in organic solvents and contain a considerable amount of organic solvents. If these organic solvents are directly discharged into the atmosphere, they will seriously pollute the environment and cause energy waste. Drying and recycling various solvents for reuse are not only in line with the requirements of environmental protection, but also the requirements of the company's own development. Therefore, for the drying of these drugs and APIs, it is more appropriate to choose a closed-circuit drying system, which can effectively achieve economical, Effective unification of environmental and social benefits. In recent years, when drying anaerobic materials or materials containing flammable and explosive organic solvents, and the organic solvents can be recycled and cannot be discharged into the atmosphere, closed-circuit dryer

Working principle of vertical closed-circuit dryer

Nitrogen filling and oxygen removal process Close the corresponding pipeline control valve, the system is in a completely closed state, open the air exhaust pump, and pump out the air in the system, so that the system reaches a micro-negative pressure state, when the system pressure gauge shows a certain value, close the corresponding emptying valve, and at the same time Turn off the exhaust air pump. At this time, the nitrogen filling control valve is opened, and nitrogen is filled into the system. When the online oxygen detection device detects that the residual oxygen in the system is less than the required value, the system is in a slightly positive pressure state. At this time, the nitrogen filling control valve is closed and the next step is entered. process. Drying process