(719h) Solvent Recovery by Psa , a Simulation Study

Pressure swing adsorption (PSA) method is a cyclic process useful for the separation of gaseous mixtures. Though there were some problems to be solved, there may be some possibility to apply PSA to solvent recovery.

In this study, the solvent recovery by PSA with precoatsilicagel was tested. As a first step, CH2Cl2 was chosen as solvent and the following items were examined.

Isotherms and dynamics of CH2Cl2 adsorption for commercial precoatsilicagel. CH2Cl2 recovery from air was tried to obtain basic data, using a PSA system, consisted of two columns. A numerical calculation of PSA operation were performed with the Stop&Go method and results were compared with the experimental results.

Since it was confirmed that the experimental data could be well simulated by the Stop&Go method, this simulation can be used to assess the performance of PSA with various adsorbent using basic data and to predict the behavior of gases in the column, such as the distribution of the amount adsorbed in the axial direction, and to estimate the effect of operational factors.