Cleaning of extraction effluents
One of the most important fibers, polyamide 6, is produced by polymerization
of caprolactam. Large quantities of extraction effluents are produced in this
process. The effluents are cleaned in evaporation plants: the valuable
substance is recovered, waste products are minimized, and existing energies
from the caprolactam production can be used.
Moreover, evaporation
plants are used in this process as sump evaporators for distillation plants.
The particular features of GEA Wiegand plants are:
Economic
conception in order to minimize the caprolactam losses
Long operating
periods thanks to an optimum temperature
Many years of experience in the
application of mechanical vapor recompressors
4-effect Wiegand falling film evaporation plant in counterflow
arrangement
1 falling film evaporator - effect I
2 falling film evaporator - effect
II
3 falling film evaporator - effect III
4 falling film evaporator -
effect IV
5 condenser
6 column |
A product
B concentrate
C condensate
D live steam
E cooling
water
F inert gas |