Technology Unit

: Evaporator System
: UPM Hydroprocessing
Short Name: Evaporator System
Description: Crude tall oil (CTO) is fed from storage at a temperature of 60°C to an evaporation unit containing a thin film evaporator, a plate molecular still and a short path evaporator. The first evaporation step is performed on a thin film evaporator to remove water, turpentine and light fatty acids from the feed of crude tall oil. The condensate recovered from the first evaporator is fed further to a second evaporator. The second evaporation step is performed on a plate molecular still. 50% of the amount of the original feed of crude tall oil is removed from the second evaporation step as a heavy fraction. Distillate is recovered from the second evaporating step. The heavy fraction from the second evaporation step is fed to the third evaporation step. The third evaporation step is performed on a short path evaporator. Distillates from evaporation stages 2 and 3 are collected and mixed together. The superdepitched and purified CTO has a 5 ppm metal content.
Link: https://patents.google.com/patent/EP2940111B1/en