Vobis multiple effect Forced Circulation Evaporators are well suited for feed streams with either high viscosity, with the tendency to crystallize when concentrated, or which tend to foul or scale heat transfer surfaces.  Vobis Forced Circulation Evaporators are designed to insure efficient processing.  First, the pump circulates the liquid feed material through the appropriately sized heat exchanger tubes at a high velocity; the feed material’s velocity is high enough to provide rapid heat renewal and transfer, and to keep the heat transfer surfaces free of fouling and scaling even with high viscosity solutions and heavy slurries with crystals. The vaporization of the volatile components does not take place until the vapor head of the vapor separator.  The forced circulation evaporator system vapor separators are specifically designed to minimize entrainment of droplets.  This is coupled with high efficiency entrainment separation technologies to further reduce entrainment.  (Liquid level is maintained in the heat exchanger above the heated surface and evaporation takes place only in the separator, which prevents fouling.)  Typically designed for and operated under a slight vacuum, the temperature required for evaporation is reduced to protect heat sensitive products.  

 

Vobis Forced Circulation Evaporators feature:

  • Scaling and fouling minimized through advanced design

  • Suitable for semi viscous solutions and suspensions

  • High heat transfer coefficients

  • Better for higher solids quantities than falling film evaporators

  • Heat exchange optimized by control of flow velocity in the tubes

  • Low temperature operation under vacuum to minimize product degradation

  • A wide range of available corrosion resistant construction materials including titanium

  • High turn down ratio

Vobis production scale multiple effect forced circulation evaporators are recommended for clients seeking to efficiently process either viscous or suspended solids containing feed streams or who have heat sensitive products which have a tendency to foul or scale the heat transfer surfaces of evaporators.  Our multiple-effect evaporator systems can incorporate mechanical vapor compression or thermal vapor compression for added energy efficiency.

Please note:  Vobis, LLC also manufactures pilot scale systems, which can be seen at our pilot evaporators website.