Application of Screw Vacuum Pumps in Solvent Recovery

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 Solvent recovery is a critical process in industries such as chemical, pharmaceutical, petrochemical, and environmental protection. It involves recovering solvents from process streams or waste products for reuse, which helps in reducing costs and minimizing environmental impact. Screw vacuum pumps have become a preferred choice in solvent recovery systems due to their reliability, efficiency, and ability to handle various types of gases and vapors. This article discusses the application of screw vacuum pumps in solvent recovery,

In the production of active pharmaceutical ingredients (APIs), the solvent crystallization process involves several critical steps: filtration, washing, and vacuum drying after crystallization. The moisture content of the material is generally around 20%, and the drying temperature should not exceed 80°C. After drying, the moisture content of the API must be reduced to below 0.5%. To remove the solvent from the material effectively, the pressure inside the drying chamber must be lower than the solvent's saturation vapor pressure at the drying temperature. Typically, this requires drying under medium vacuum pressures ranging from 0.1 to 50 Pa.

The solvents carried by the wet materials are often hazardous chemicals that are flammable, explosive, toxic, or harmful. During the drying process, these solvents are removed by the vacuum system.

Traditional Wet Vacuum Systems: Challenges in Solvent Recovery

Conventional wet vacuum systems commonly use a combination of Roots vacuum pumps and liquid ring pumps. However, liquid ring pumps utilize a sealing liquid that can dissolve or absorb a portion of the organic solvent during operation. This results in the solvent being separated into waste gas and high-concentration organic waste liquid in the gas-liquid separator tank. Both of these waste products require further treatment. This not only prevents full recovery of the solvent but also increases operational costs for the enterprise. Moreover, it poses significant health, safety, and environmental risks.

Dry Vacuum Systems with Screw Vacuum Pumps: A Superior Solution

In contrast, using a dry vacuum system consisting of a Roots pump and a screw vacuum pump allows the organic solvent to condense on the exhaust side during the drying process, enabling solvent recovery. Screw vacuum pumps offer several distinct advantages:

  1. No Use of Process Medium in the Pump Chamber: The screw vacuum pump operates without any process medium in the pump chamber, making it more energy-efficient and environmentally friendly. Unlike liquid ring pumps, there are no issues with waste liquid treatment, and the solvent can be entirely recovered.

  2. Energy Efficiency and Environmental Protection: The absence of any sealing or working fluid means that the screw vacuum pump eliminates the risk of solvent contamination and significantly reduces the need for additional waste treatment processes. This translates to lower operating costs and a safer working environment.

  3. Complete Solvent Recovery: Since the screw vacuum pump allows for solvent condensation and recovery at the exhaust side, the recovered solvent is pure and can be reused in the process. This not only maximizes the use of resources but also minimizes waste and environmental impact.

Due to these benefits, screw vacuum pumps have become the preferred choice in applications involving solvent recovery during the drying process of pharmaceutical raw materials. They provide an effective solution for handling hazardous solvents, ensuring energy efficiency, safety, and environmental compliance.

Contact us 

For more information about Application of Screw Vacuum Pumps in Solvent Recovery, contact Nuoxutech at contact@nuoxutech.com or visit our website www.nuoxutech.com .You can also reach us on WhatsApp at +86 13849062209.Our team is ready to provide you with professional service and support.

Keywords:nuoxutech,dry screw,Screw vacuum pump, solvent recovery, vacuum drying, pharmaceutical industry, dry vacuum system

 


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