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Continuous Industrial Drying Equipment and Systems


The drying of solids may be simplified into two categories, constant-rate and falling-rate drying. In constant-rate drying, the volatile material is usually on the surface of the solid particle and the limiting factor for removal is the supply of heat. In falling-rate drying, the volatile is typically bound within the particle and the limiting factor for removal can be either the rate of mass transfer (time) or the equilibrium between the solid and the gas phase.

A combination of heat, gas, and agitation are essential for process drying. The location and level of these key inputs are what distinguish direct and indirect drying systems. The selection of one drying approach over the other is largely determined by the material to be dried. With good design and modeling techniques, testing, and sound judgment in process selection, optimization of performance objectives may be achieved. These objectives may include reduction of system complexity, thermal degradation reduction, byproduct formation, efficiency improvements, safety, or recovery of volatiles.

drying curve graph - bepex international
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  • Flash drying temperature-sensitive organic materials to a shelf-stable moisture level
  • Direct drying wet agglomerates or granules to cure freshly grown particles
  • Long residence hopper drying to virtually eliminate any trace of solvent

Selection of a Drying Product

Factors in process design and selection include the method of drying necessary, residence times required, temperature sensitivity, and material properties.

Starting typically by generating a simple drying curve we assess the feasibility of our technology. The drying curve plots product moisture on a dry basis (pounds of moisture per pound of dry solids) against drying time in batch mode operation. A corresponding plot of product temperature against drying time is often displayed on the drying curve.

From here we turn benchtop analysis into action in our Process Development Center. Whether testing a single drying operation or simulating an entire process system, we have the space, equipment, and personnel to turn your idea into a reality.


Drying not quite what you were looking for? Take a look at our other thermal and separation processes to see if there is a better fit for your application.


Thermal drying and mechanical separation processing equipment by Bepex include direct, indirect, and mechanical separation products. Each of our products is available for testing in our Process Development Center, and each have their own unique use cases. Click below to learn more about each product, or contact us today to begin your drying or separation project with Bepex.


Interested in learning more about our drying processes?