(395p) Examination of Solvent Recovery by Pressure Swing Adsorption (PSA) Method－Influence of Coexistence Humidity－

Kazuyuki Chihara^1*, 〇Jun Kobayashi¹,Kouki Aoshima¹,Takuya Chiyoda ¹,

1) Meiji University, Japan

1-1-1 Higashi-mita, Tama-ku, Kawasaki 214-8571, Japan

Corresponding author, FAX +81-44-934-7197, E-mail: chihara@isc.meiji.ac.jp

An organic solvent exhausted by the factory negatively affects the human body and the environment. The recovery and the removal are indispensable operations in a chemical industrial process. Water vapor obstructs the adsorption of an adsorbate and results in gradual deterioration of an absorbent. It is necessary to examine how water vapor affects the organic solvent recovery. As a method of removing the organic solvent, adsorption in the chemical engineering field is used. There is pressure swing adsorption (PSA) method using the technique; An operation pressure is alternately changed with the high pressure and the low pressure. It is a method using the difference of the amount of adsorption. In the present 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. CH₂Cl₂ 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. As a result, the density of the solvent in product gas increased when the ratio of water vapor increased . It is clear that water vapor influences the adsorption of CH₂Cl₂.