(395q) Adsorption of Organics On MSC5A in Supercritical CO2, Chromatographic Measurements & Stop & Go Simulation

Kazuyuki CHIHARA^1*, ?Shingo ITO¹, Masashi SHINSAKO¹, Hideaki NAGASHIMA, Mai HIKITA

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

Chromatographic measurements were made for the adsorption of benzene, toluene and m-xylene on molecular sieving carbon (MSC) in CO₂ mixed with organics. Supercritical chromatograph packed with MSC was used to detect pulse responses of organics. Adsorption equilibria and adsorption dynamics paremeters for organics were obtained by moment analysis of the response peaks. Figure1 shows the experimental apparatus. Supercritical CO₂ mixed with small amount organics (benzene, toluene, m-xylene) flowed as carrier in chromatograph. Adsorbates applied as pulse used same or different organics mixed with supercritical CO₂. Figure2 shows the response peak curves when we used benzene as pulse and supercritical CO₂mixed with benzene as carrier.

Stop&Go method was used as one of the simulation methods of perturbation chromatography which examine adsorption equilibrium and rate.Figure3 shows calculation method thought completely-mixed-layer bank of N in axial direction of column. If the flow stopped only dt second, the adsorbate was made batch adsorption into each cells. After dt second, think material balance in absorption and desorption of each cell within a stopped time frame. Figure4 shows the response peak curves of organic compounds (carrier:supercritical CO₂ + benzene, pulse: benzene).