Design and Simulation of Methanol and Dimethyl Ether (DME) Production from Biomass-derived Syngas

Abstract

The synthesis of methanol and dimethyl ether (DME) through the hydrogenation of C O 2 -enriched syngas derived from biomass gasification represents a promising approach to mitigate global warming and to reduce dependence on non-renewable crude oil sources. This study aims to comprehensive assess one-step DME synthesis, focusing on key performance indicators such as molar feed ratios, carbon oxides (C O x ) conversions, and product yield. Using Aspen Plus simulation software, this research delves into the diverse compositional spectrum of C O 2 -enriched syngas feedstocks generated from biomass gasification. The evaluation process spans a broad parameter space, considering factors like reaction temperature (ranging from 200°C to 300°C), reaction pressure (varying between 30 and 80 bar), and molar feed ratios of H 2 /CO, H 2 /C O 2 , CO/C O 2 . An H2/COx=3 ratio strikes a delicate balance between large H2 partial pressure, boosting the reaction (thermodynamically and kinetically), and reduced H2 excess. The thermodynamic and kinetic analysis reveal a negative CO2 conversion. Within the investigated range of operating conditions, 50 bar pressure and 220 °C temperature provided the highest yields and CO conversion.