关键词: pulsed-sieve-plate column;extraction;ε-caprolactam;waste water

Abstract: Recovery of caprolactam from waste water of caprolactam production factory was investigated
using benzene as solvent in a small-scale pulsed-sieve-plate column. First, liquid-liquid
equilibrium (LLE) data were measured, including water-caprolactam-benzene system at low
caprolactam concentrations, and waste water-benzene system. Then, the operating regions and
mass transfer of the pulsed-sieve-plate column were measured. Finally,the overall apparent
heights of a transfer unit based on continuous phase are correlated in terms of the column
operation variables.

Key words: pulsed-sieve-plate column, extraction, ε-caprolactam, waste water