| 초록 |
Two Methanol-to-Dimethyl ether (MTD) process scenarios 1 and 2 were proposed to develop new MTD processes with improved energy efficiency, by using crude methanol (i.e., water-containing methanol) combined with a water-tolerant K-modified HZSM-5 catalyst. Process modeling was implemented to obtain the quantitative energy analysis results via Aspen Plus software. Both scenarios mainly comprise units of methanol preheating, methanol dehydration, DME separation, methanol separation, and crude methanol recycling. While, the main difference is the way of methanol recycling. The process performance was investigated by varying the recycle ratio or the recycled methanol purity in scenarios 1 and 2, respectively, and compared with the conventional γ-Al2O3 based MTD process. Both Scenarios were shown to be more energy-efficient, and scenario 2 seems to be more beneficial for saving energy as well as CAPEX and OPEX. |
