Thermodynamic Equilibrium Calculations of LPDME Process from Synthesis gas

Thermodynamic analysis of single-step synthesis of dimethyl ether (DME) from syngas over a bi- functional catalyst in a slurry bed reactor have been investigated as a function of temperature (200–240 ◦C), Pressure (20-50 bar) and composition of feed ratio (H2/CO: 1–2). The bi-functional catalyst was prepared by physical mixing of CuO/ZnO/Al2O3 as a methanol synthesis catalyst and H-ZSM-5 as a methanol dehydration catalyst. The three reactions including methanol synthesis from CO and H2, methanol dehydration to dimethyl ether (DME) and water-gas shift reaction were chosen as the independent reactions. Thermodynamic equilibrium constants of these reactions and equilibrium composition of all components were determined from experimental and theoretical calculations. Moreover, the effect of reaction temperature, pressure and H2/CO ratio in feed at equilibrium conditions were predicted by thermodynamic model.

کلیدواژه ها:

Dimethyl Ether ، Syngas ، slurry reactor ، thermodynamic modeling