Diafiltration of polymers with VSEP provides unprecedented performance and product quality with no pretreatment

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Courtesy of New Logic Research, Inc.

Recent technological advances in membrane architecture and system design have created a new opportunity for efficient diafiltration or desalting of various organic polymers and inorganic chemicals. V✧SEP, (Vibratory Shear Enhanced Process), developed by New Logic makes it possible to wash larger solutes and remove smaller contaminant solutes without the fouling problems exhibited by conventional membrane systems. The V✧SEP membrane system is capable of extremely high recoveries of filtrate, thus minimizing the volume of wash water and consequently reducing treatment costs.

Extremely high shear energy is delivered directly to the surface of the membrane eliminating the gel layer buildup while maximizing flux rates. By deriving shear from the membrane movement, V✧SEP delivers shear rates 10-15 times higher than that of conventional cross flow systems. Unlike conventional membrane configurations, the direction of the shear is changed at a frequency of 50 times per second creating over 200 G’s of force with each change in direction. The V✧SEP treatment system uses Nanofiltration or Ultrafiltration membrane modules to sequentially replace the solvent and remove  permeable species that are not desired by using continuous dilution and removal of filtrate. The solvent and solute are fed to a process tank and a side stream of deionizedclean water is added on a continuous basis.

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