بررسي نقش پارامترهاي عملياتي در بازدهي سنتز مستقيم دي متيل اتر از گاز سنتز

Investigation the Effects of Operating Conditions on the Performance of Direct Synthesis of Dimethyl Ether from Synthesis Gas

Optimum operating conditions of a single - step synthesis of dimethyl ether (DME) from synthesis gas has been determined. The bifunctional catalyst has been prepared by physical mixing of a commercial methanol catalyst (KMT, Russia) and a dehydration catalyst (H-MF-90) and has been characterized by XRD, XRF and BET techniques. Catalytic synthesis of dimethyl ether from synthesis gas was evaluated in agitated slurry micro reactor at different ranges of operating conditions which have been determined by experimental design according to Taguachi algorithm. The range of operating conditions were chosen as follows: H2 /CO mole ratio in feed varying from 0.26 to 1.5, the pressure varying from 10 to 50 bar, the temperature varying from 200 to 240 °C. Nine experiments have been conducted with different operating conditions at fixed impeller speed equal to 1600 rpm and space velocity equal to 500 ml/gcat.h. By using the results of experiments, optimum conditions for direct synthesis of DME were predicted as follows: T= 240 °C, P=33.3 Bar, H2 /CO=1.5 and weight ratio of methanol catalyst to dehydration catalyst equal to 3.