(395aj) Solvent Recovery of 3 Component PSA Experiments and Influence of Water Vapor

When an organic solvent is drained from a
factory , the organic solvent adversely affects the human body and the
environment. Therefore , we study the adsorption method called the PSA method
to collect the disposal gas. Water vapor obstructs the adsorption of an
adsorbate and results in gradual deterioration of an adsorbent. We examined how
water vapor affects the organic solvent recovery. As a method of removing the
organic solvent , we are desired to use adsorption in the chemical field. It is
PSA method. Adsorption of PSA depend on pressure , each operation pressure is
alternately changed with the high pressure and the low pressure. Accoding to
two kind of operation pressure , unit device of PSA is conducted adsorption and
desorption at the same time.

In this study , water vapor content in the
mixed gas was changed and the behavior of the density of the solvent in the
product gas was examined with Stripping reflux PSA unit like Figure.1. As is
Figure 1, flow gas repeats alternatively adsorption and desorption inturn in
courses and , in each column which filled an adsorbent separate the gas well.
CH₂Cl₂ and CCL₄ and water vapor were chosen as
an adsorbate. Silica gel (CaRiACT Q-6) was chosen as an adsorbent.The recovery
experiment of the organic solvent was conducted by PSA method. And , we tried
to optimize the experiment method about Stripping-reflux PSA for solvent
recovery by process simulation , named Stop & Go method. Process simulation
using this method was able to compare the experimental data. In the same way as
experiment, simulation operation sequence of PSA can carry out tentative
experiment to process. And , to check how the column is adsorbed , we conducted
a study to know the adsorption distribution. Compared with simulation (Stop
& Go) , we considered whether there is placticability.

Fig.1 Stripping
Re-flux PSA unit