Forced Circulation Re-boiler Proprietary Process Liquid

Forced Circulation Re-boiler Proprietary Process Liquid
ApplicationForced Circulation Re-boiler Proprietary Process Liquid
Fouling Issue / Frequency

A steam-heated evaporation system recovers a volatile organic from a heavy organic solution laden with foulants. A hard, black scale that was forming in the upper 25% of the tubes was forcing the plant to switch two parallel once-through rising film evaporators with a clean pair every four to five days. When asked to increase throughput and simplify operations engineers considered installing a 2100-sq-ft falling film evaporator (FFE) to operate in series with the existing rising film evaporators (RFE). Although the combination system was expected to run approximately 10 weeks between cleanings, a better solution was needed.

Solution / Approach

A fluidized bed heat exchanger used as a re-boiler for an evaporator system to recover a volatile organic (82 m2)

Process ConditionsTubeShell

Proprietary Liquid

Condensing Steam


5 barg

11.4 barg

TemperatureIn: 124 oC
Out: 150oC

Condensing at 181.5 oC

Flow160 m3/h788 m3/h



Number of Tubes


Length of Tubes

10.5 m

Diameter Tubes

47.5 mm

Particle Type

Stainless Steel

Particle Size2 mm

More than 20 years in operation.

No cleanings per year required compared to the 70 cleanings per year with the conventional re-boiler (annual turnaround replaces cleaning every 4 to 5 days).

A significant cost saving results from the higher recovery of acetic acid and the more concentrated residue in the bottoms.

The re-boiler circulation rate has been constant, thus providing uniform tower operation and more total throughput.


Contact us at:

Klaren International BV
Hanzeweg 35N
3771 NG Barneveld
The Netherlands

Phone: +31 85 27 34 834

Any questions?

We would be happy to answer them.

+31 85 27 34 834