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          Separation Technology of Solvent System

          Solvent resistant nanofiltration membrane filtration technology contains a membrane module and the solvent containing at least one solute. The raw material passes through the membrane at pressures no higher than 60bar. As a result of the nanopore of the membrane, the solvent becomes a penetration object through the membrane, and then the concentrated solute is blocked by the membrane (= residue). One or multiple solutes enter the penetration object through the membrane, while the others remain in the residue. The intercepted molecular weight can be selected in the range of 150Da-900Da.

              Process advantages:

           

          •   Organic solvent resistant nanofiltration membrane can be operated at normal temperature or low temperature without affecting the activity of active substances;
          •   Organic solvent resistant nanofiltration membrane can filter and separate the active substances in organic solvents to reduce input and the process;
          •   Repeated filtrations of organic solvent resistant nanofiltration membrane can improve the yield of products;
          •   Multi-level parallel connection of organic solvent nanofiltration membrane multistage parallel can increase production scale;
          •   Multi-level series of organic solvent resistant nanofiltration membrane can be used to improve the purity of products;
          •   Reduce the difficulty of integration of system engineering and improve the reliability of operation separation.


              The tolerable solvents include:

          •   Acetonitrile
          •   Ethyl acetate
          •   Isopropyl alcohol
          •   Tetrahydrofuran (THF)
          •   Toluene
          •   N-methylpyrrolidone
          •   Acetone
          •   Methanol
          •   Ethanol
          •   Ethane
          •   Dimethylformamide
          •   Dichloromethane
          •   Alcohol


              Application area:

          •   Paint coating: waste liquid flow used for purification production line, recycle valuable solvents and coatings
          •   Medicine: purification of concentrated drugs and intermediates in solvent medium
          •   Recovery of antibiotics and peptides
          •   Reclaim dissolved chemical substances
          •   Solvent purification
          •   Recovery of polymer binder and separation of pigments
          •   Recovery of dissolved catalyst
          •   Recovery of hydrocarbon during cleaning

           



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