By using Zeolitic imidazolate framework-67(ZIF-67)/water-ethylene glycol slurry, we separated methane/ ethylene gas mixtures by the absorption-adsorption method. The influences of temperature, mass fraction of cobalt(2+) 2-methyl-1H-imidazole (ZIF-67) RN 46201-07-4 in ZIF-67/water-ethylene glycol slurry, pressure, and gas-slurry ratio on the separation performance were studied systematically. We found lower temperature, mass fraction of ZIF-67 of 0.15, higher gaseliquid ratio, and higher operation pressure are suitable for separation of methane/ethylene mixture. The experimental results show by using the slurry we synthesized, the mole fraction of ethylene in gas phase decreases from 74.8 to 53.0%, the selectivity coefficient reaches 10 (much higher than that of solid ZIF-67), and more than 68% of C2H4 can be recovered after one stage of the absorption-adsorption process. Sorption enthalpy of methane and ethylene at low loading is only 11 and 17 kJ/mol, respectively. In addition, the crystal structure of ZIF-67 remains intact after 20 adsorption/desorption cycles.
Compounds
#
Formula
Name
1
CH4
methane
2
C2H4
ethene
3
C4H10O3
diethylene glycol
4
H2O
water
Datasets
The table above is generated from the ThermoML associated json file (link above).
POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied;
the numbers refer to the table of compounds on the left.