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Fixed Clearance Evaporators |
Fixed Clearance Evaporators
Pfaudler has recently added the Fixed Clearance Evaporator (FCE) to its line of thin film evaporators. These thin film evaporators have found a niche in difficult evaporation operations. Though this style evaporator can be used in almost any application, the FCE excels in distillation steps where products are heat sensitive, viscous, tend to foul heated surfaces, or are high boiling. The fixed clearance evaporator is a close relative of Pfaudler's more popular Wiped Film Evaporator and operates more effectively in a handful of process situations such as lecithin processing, evaporation to dryness, and high viscosity applications. With this addition, Pfaudler can now service a wider range of process needs.
Major Benefits of a FCE
- Short Residence Time (liquid is on the hot surface for seconds)
- Operate Under High Vacuum (reduced operating temperature)
- Excellent Heat Transfer (process film is continuously agitated)
- Handle Viscous Fluids (high tip speed provides thin film)
- Handle Dirty/Fouling Fluids (rotor continuously agitates film)
- >90% Distillate in Single Pass (without recirculating)
How does it work?
- Feed enters at top
- Falls to rotating distributor plate
- Evenly distributed to heat transfer wall
- A fine gap between the rotor and the wall creates a thin film
- Heat is transferred from jacket
- Vapors are generated and flow counter current to the liquid and exit
- Bottoms product continues down wall and exits bottoms outlet
Types of Blades Available
- Fixed - adjustable clearance between blade and wall (most common)
- Hinged - creates variable wall clearance and contact force (typical for solids)
- Scraper - used in high fouling applications
Pfaudler Fixed Clearance Evaporators are engineered and built per A.S.M.E. code Section VIII Div. 1. European Pressure Vessel Directive (PED) and the Chinese Safety Quality License are also available upon request.
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