vertical screw dry vacuum pump in solvent recovery of pharmaceutical industry

At present, the development of various vacuum pumps is more and more affected by vacuum applications. The general traditional vacuum pump system has been unable to meet the requirements of clean, oil-free, corrosion-resistant, condensable steam extraction and operation under harsh conditions. Therefore, in recent years, the development of dry-type vacuum pump is very fast, and the vacuum products have been updated.

Vertical screw dry vacuum pump is an ideal pump which appeared in the early 1990s. It has a series of advantages, such as wide pumping speed range, simple and compact structure, no friction components in the pump cavity, low energy consumption, no waste liquid discharge and low operating cost. Therefore, it has been widely used in semiconductor, photovoltaic industry, chemical industry, pharmaceutical industry, petrochemical industry, space simulation, low-pressure wind tunnel and other fields.

Application of vertical screw dry vacuum pump in solvent recovery of pharmaceutical industry:

The crude drug with solvent crystallization process should be filtered, washed and vacuum dried after crystallization. The moisture content of the material is generally about 20%, and the heating temperature cannot exceed 80 ℃. After drying, the moisture content of the API should be lower than 0.5%. In order to remove the solvent in the material, the pressure in the drying tank should be lower than the saturated vapor pressure of the solvent at the drying temperature. It is usually required to dry under the medium vacuum pressure of 0.1 ~ 50pA.

The solvent of wet materials is usually flammable, explosive, toxic and harmful chemicals, which are pumped away by vacuum unit during drying.

Roots liquid ring vacuum pump unit is widely used in traditional wet vacuum system. The sealing fluid of liquid ring vacuum pump will dissolve or absorb some organic solvent during operation, and separate into waste gas and high concentration organic waste liquid in vapor-liquid separation tank. However, both parts need to be treated. This not only can not fully recover this part of solvent, but also increases the operation cost of enterprises, which is more beneficial to health and safety And environmental protection.

The dry vacuum system composed of Roots vacuum pump and vertical screw dry vacuum pump can condense the organic solvent in the drying process on the exhaust side and realize solvent recovery. As there is no other process medium in the pump cavity of vertical screw dry vacuum pump, it is energy-saving and environmental protection, and there is no waste liquid treatment problem. The solvent can be recovered completely. Therefore, the vertical screw dry vacuum pump has become the best choice in this application field.