Thermodynamic adsorption data of CH4, C2H6, C2H4 as the OCM process hydrocarbons on SAPO-34 molecular sieve

다국어 초록 (Multilingual Abstract)

Adsorption of CH4, C2H6 and C2H4, the feed and main products of oxidative coupling process of methane(OCM) has been studied on silicoalumina-phosphate molecular sieve (SAPO-34) in mild conditions. Theexperiments were conducted in a batch system based on volumetric adsorption measurement techniquefor determination equilibrium adsorption capacity in the absolute pressure range of 100–1000 kPa andat the isothermal temperatures of 303, 313 and 323 K. Various isotherm equations were fitted on theadsorption equilibrium data and the model parameters were predicted as a function of temperature.
Isosteric heats of adsorption were determined using Clausius–Clapeyron equation at different surfacecoverage. Maximum capacity of SAPO-34 was observed at 303 K and 880–900 kPa equilibrium pressurewith 1.25, 2.02 and 4.67 mmol/g adsorbed amount for methane, ethane and ethylene adsorption,respectively. The adsorption selectivity of ethane and ethylene against methane were determined andthe appropriate potential of SAPO-34 was observed for separation of OCM products from methane. Theisotherm models and enthalpy of adsorption can be efficiently used for the simulation of the adsorptionprocess constructed at the downstream of the OCM process for separation of ethane and ethylene frommethane.

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