High Pressure Adsorptive Separation of Ethylene and Ethane on Na-ETS-10

MENG SHI, ADOLFO M. AVILA, FAN YANG, TETYANA M. KUZNICKI, STEVEN M. KUZNICKI

CHEMICAL ENGINEERING SCIENCE

PERGAMON-ELSEVIER SCIENCE LTD

Lugar: Amsterdam; Año: 2011 vol. 66 p. 2817 - 2822

0009-2509

     Previously, we reported that Na-ETS-10 can be used to separate a mixture of ethylene and ethane from an industrial process stream under low pressure (101 kPa) with a binary bed selectivity of 5 at 298 K and 101.3 kPa. In this study, we show that selectivity improves considerably under high pressure conditions. Na-ETS-10 was used as a packed bed adsorbent to separate an ethylene/ethane 59/41 mixture over a pressure range of 101 – 2,580 kPa and at two different temperatures (273 and 298 K). At these pressures, pure ethane gas raffinate streams prior to ethylene breakthrough are obtained. The extract phase obtained following desorption from the packed bed column contained up to 94% ethylene. The separation performance improved as adsorption column pressures increased. The ethylene/ethane bed selectivity achieved at 298 K and 2,580 kPa was ~11, more than double the previously reported selectivity under low pressure.