ENEA-Italian Agency for New Technologies, Energy and Sustainable Economic Development, Energy Technologies and Renewable Sources Department, Trisaia Research Centre, I-75026 Rotondella, Italy.
Int J Environ Res Public Health. 2021 Jan 19;18(2):807. doi: 10.3390/ijerph18020807.
The production of dimethyl ether from renewables or waste is a promising strategy to push towards a sustainable energy transition of alternative eco-friendly diesel fuel. In this work, we simulate the synthesis of dimethyl ether from a syngas (a mixture of CO, CO and H) produced from gasification of digestate. In particular, a thermodynamic analysis was performed to individuate the best process conditions and syngas conditioning processes to maximize yield to dimethyl etehr (DME). Process simulation was carried out by ChemCAD software, and it was particularly focused on the effect of process conditions of both water gas shift and CO absorption by Selexol on the syngas composition, with a direct influence on DME productivity. The final best flowsheet and the best process conditions were evaluated in terms of CO equivalent emissions. Results show direct DME synthesis global yield was higher without the WGS section and with a carbon capture equal to 85%. The final environmental impact was found equal to -113 kgCO/GJ, demonstrating that DME synthesis from digestate may be considered as a suitable strategy for carbon dioxide recycling.
从可再生能源或废物中生产二甲醚是推动可持续能源转型替代生态友好型柴油的有前途的策略。在这项工作中，我们模拟了从消化液气化产生的合成气（CO、CO 和 H 的混合物）合成二甲醚。特别是，进行了热力学分析以确定最佳工艺条件和合成气调节工艺，以最大限度地提高二甲醚（DME）的产率。通过 ChemCAD 软件进行了过程模拟，特别关注了水煤气变换和 Selexol 吸收 CO 的工艺条件对合成气组成的影响，这对 DME 生产率有直接影响。最终根据 CO 当量排放评估了最佳流程图和最佳工艺条件。结果表明，没有 WGS 部分和碳捕获等于 85%时，直接 DME 合成总收率更高。最终的环境影响等于-113kgCO/GJ，表明从消化液中合成 DME 可以被认为是二氧化碳回收的一种合适策略。
