Distribution Coefficient of Caprolactam and Methyl Caprolactam Using Benzene or Toluene as Extractants: Experiments and Prediction

摘要

To get high purity Caprolactam is a challenging task in the chemical fiber industry. To date, reports on the prediction of the distribution of Caprolactam and its derivative chemicals have been few. In this study, the extraction of caprolactam with toluene as the extractant and Af-methyl Caprolactam with benzene and toluene as the extractants has been carried out. By defining new UNIFAC groups and calibrating related interaction parameters, a UNIFAC method was introduced to predict the equilibrium concentration of caprolactam and methyl caprolactam in toluene or benzene extraction processes. The calculated results fit very well with the experimental data. Using the UNIFAC model, the selectivity of extractants can be predicted.