Slurry Bed Carbon-rich Synthesis Gas To Dme Process And Dynamics

Because of the more and more serious energy and environment problem, the study on production and application of dimethyl ether (DME) has already attracted extensive attention. The synthesis technique and reaction mechanism of DME at home and abroad are discussed detailedly in this paper, basing on the abundant CO resource from the industrial tail gas in Yunnan. Firstly, the bifunctional catalyst for single-step synthesis of DME was prepared from C301 and γ-Al₂O₃, and the effect of feed gas ratio, temperature, pressure, space velocity, catalyst concentration and stirring speed was investigated in a slurry reactor.Secondly, the P modified bifunctional catalysts of C301/γ-Al₂O₃ were prepared, and investigated in the synthesis of DME, then combining with BET, XRD and FT-IR analysis, a process mechanism of P-modified was brought forward.The kinetic study of DME synthesis from rich CO syngas over modified bifunctional catalyst of C301/P-/γ-Al₂O₃ was carried out under conditions: CO/H₂=1.325, T =210-300 ℃ , P =2⁴.3MPa, S_v =600¹800mL/hgcal, Rev =750r/min, wCal =7.27%, RCal=4. The intrinsic kinetic models of DME synthesis process from rich CO syngas over C301/P-/γ-Al₂O₃ were showed as follows:Rate equation of methanol synthesis reaction:Rate equation of methanol dehydration reaction:Rate equation of water gas-shift reaction:k3PC0Pw(l-j33)r3 =KCOPCO + KCO2 PCO2 XI + <5 K% +PWKW)11921=1.361xlO4-exp(—RT...