The bulk drug with solvent crystallization process is usually filtered, washed and vacuum dried after crystallization. The moisture content of the material is usually 20% ~ 200%. The solvent contained in the wet material is usually flammable, explosive, toxic and harmful medium, which is pumped away by the vacuum unit during the drying process.
Roots liquid ring vacuum pump unit is widely used in traditional liquid ring vacuum system. The working fluid of liquid ring pump will dissolve or absorb some organic solvent during operation, the separation of waste gas and high concentration organic waste liquid in the vapor-liquid separator needs to be treated, which not only can not fully recover this part of solvent, but also increases the operating cost of enterprises, which brings challenges to health, safety and environmental protection; If the dry vacuum condensation system is used, the organic solvent in the drying process can be condensed at the exhaust side, and the solvent recovery and zero discharge of waste water and waste liquid can be realized. There is no other process medium in the cavity of EVP screw pump. The internal surface of EVP screw pump adopts Hastelloy coating anti-corrosion measures, which is energy-saving and environmental protection, and there is no waste liquid treatment problem. The solvent can be recovered completely. Therefore, EVP screw vacuum pump has become the best choice in this application field.
In solvent recovery of pharmaceutical industry, EVP screw pump vacuum unit is an important equipment in gasoline vapor recovery unit; In order to improve the pumping speed and vacuum degree of the vacuum unit and reduce the size of the screw pump as much as possible, EVP will usually use a Roots pump and a screw vacuum pump as the two-stage unit or use two sets roots pumps and one set screw vacuum pump as the three-stage vacuum. In order to prevent the particles and dust impurity pumping into vacuum unit, the inlet filter and bag filter were usually installed at the inlet of the vacuum unit. EVP roots screw unit is as follows:
As a leading manufacturer specializing in the production of vacuum pumps. Shanghai EVP Vacuum Technology Co., Ltd. has a history of more than 20 years since 1998, which had provided many vacuum solutions to customers from different countries. The roots screw vacuum unit designed and produced by EVP,which is widely used in solvent recovery of pharmaceutical industry. Customers from all over the world are welcome to visit EVP. The roots screw vacuum unit shipment pictures with different design schemes for reference:
Editor by: Selena ZHANG
Key Words: Dry Screw Vacuum Pump; Roots screw vacuum pump system; Bag Dust Filter; Solvent recovery; Pharmaceutical
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