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High Viscosity Processor

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LCI’s Vistran™ processor is designed for thin-film processing of difficult to move fluids in the viscosity range of 50,000 to 15,000,000 cp. The high viscosity processors are used in the manufacturing and finishing of various polymers, resins, highly viscous food products and other difficult to handle materials. LCI’s high viscosity processor is ideal for these application types and many others because it provides higher heat and mass transfer rates for viscous fluids and reliability when compared to other types of evaporation equipment.

How it works

How Thin Film Evaporators Work

LCI Thin-Film High Viscosity Processors concentrate viscous solutions such as polymers and food with indirect and frictional heat transfer, mechanical agitation and transport of the thin product film under both vacuum and positive pressure conditions.

Product enters above the heated zone and is evenly distributed over the unit's inner surface by the rotor. Pitched blade elements transport the viscous material down the thermal surface and promote heat transfer.

Volatile components are rapidly evaporated and flow either counter-currently or co-currently to the liquid flow through the unit, depending on the application. In both cases, vapors are ready for condensing or subsequent processing.

Nonvolatile components are discharged at the bottom of the high viscosity processor with a specially-designed discharge section.

Its relative short residence time and open, low pressure-drop configuration allow continuous, reliable processing of many heat-sensitive, viscous materials without product degradation.


Design Principles

LCI offers high viscosity processors with the following design configurations.

Rotor Designs

Rotor Designs
  • Fixed Clearance used in combination with transported flow blades for medium viscosity applications and dilute feeds to increase evaporative capacity
  • Transported Flow provides positive transport for viscous materials which do not flow by gravity—usually those of 50,000 cp or more. The exact blade configuration will vary depending on the product characteristics.

Rotor Orientation

  • Vertical is used for all high viscosity applications. The vertical configuration provides reliable, efficient processing of viscous and fouling fluids. Units are designed with no bottom bearing.

Vapor Flow

  • Counter-current flow is normally recommended for final concentration of viscous streams.
  • Co-current flow permits processing super-heated/flashing feed streams and is often used as a pre-concentrator for vented extruders.


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