Effect of Water Vapor On the Colum of a Pressure Swing Adsorption On Solvent Recovery ‐Process Simulation and MRI Analysis‐

Organic solvent discharged from the plant adversely affect the human body and the environment. Therefore, collection and removal is an essential operation in chemical engineering process. We investigated the effect when water vapor contained in the feed gas in the solvent recovery in the PSA process. We also analyzed the columns by MRI when the experiment was terminated at a certain time to investigate the adsorption distribution in the column. Respect to experimental results, create a STOP & GO simulations, we examined the reproducibility of the experimental results.

The experiments were carried out using the experimental apparatus of two-column PSA  such as Fig.1, Which was operated by using a programmable controller, set the cycle time purge step (20 seconds) and pressurisation (160 seconds) and pressure reduction (20 seconds) and desorption step (160 seconds) , the organic solvent concentration at a constant cycle which was measured by gas chromatography. It also analyzed by MRI device the experiment was terminated at a constant cycle in, to obtain an adsorption distribution.

It is a calculation method to do the following with STOP & GO method (Fig. 2) . To think in the N cells the column, making the batch adsorption Stop the flow at a certain time. And I move to the next cell. It repeated this operation. It used three expressions of the material balance equation, equilibrium adsorption, adsorption rate expression to. Performs the simulation calculations, it is compared with the measured values.

             

Fig. 1 Stripping reflux PSA unit             Fig. 2 Stop & Go method basic concept