β Scribed by R.W. Triebe; F.H. Tezel; K.C. Khulbe
No coin nor oath required. For personal study only.
Adsorption of pure methane, ethane and ethylene on molecular sieve zeolites was examined via the gas chromatographic method to determine the potential for the separation of ethylene from light hydrocarbons.
The molecular sieves chosen for the study were H-mordenite and 13X, CaX, 4A and 5A zeolites. Henry's law constants were determined over a variety of temperature ranges between 233 and 473 K. van? Hoff plots are presented for all three gases on 4A and 5A zeolites and for methane and ethylene on the CaX and 13X zeolites and H-mordenite.
Equilibrium separation factors for the ethylene/methane system are provided for all zeolites (except clinoptilolite) over various temperature ranges. Separation is most promising with CaX zeolite, which yielded separation factors ranging from 1100 at 100Β°C to 100 at 200Β°C. Separation seems possible in 5A and CaX zeolites at very high temperatures due to the strong affinity of their divalent cations for the ethylene n-bond.
π SIMILAR VOLUMES
The adsorption of methane. ethane. ethylene, and carbon dioxide on silicalite-I and the thermodynamics of adsorption have been investigated. under simi!ar conditions using a ~r.avi~etr~c adsorption apparatus. The order for the adsorption of the different adsorbates on slllcalite-l IS CH < CO < C H .
## Abstract Molecular Dynamic (MD) simulations were carried out to determine the MaxwellβStefan (MβS) diffusivities, Δ~i~, and selfβdiffusivities, __D__~i,self~, of methane (C1), ethane (C2), and propane (C3) for a variety of molecular loadings, __q__~i~, in three classes of zeolite topologies: (1)