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Techno-economic optimization of shale gas to dimethyl ether production processes via direct and indirect synthesis routes

机译：通过直接和间接合成路线优化页岩气到二甲醚生产工艺的技术经济性

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摘要

The shale gas to dimethyl ether process via direct synthesis route with a syngas H-2/CO = 1 has a higher dimethyl ether yield than that via indirect synthesis route. However, the direct synthesis route involves various energy and capital-intensive processes, such as the complicated dimethyl ether separation process, and the CO2 recycle and compression process. In this study, a techno-economic analysis of the shale gas to dimethyl ether process via direct and indirect synthesis routes is performed using Aspen Process Economic Analyzer based on the rigorous process model developed in Aspen Plus. Effects of different CO2 removal technologies and dimethyl ether synthesis technologies from syngas are evaluated. Both, direct and indirect plants are optimized in Aspen Plus equation oriented environment using the rigorous process models. The effects of key design parameters (i.e. HZ/CO in the syngas) as well as investment parameters (i.e. prices of raw materials, products, and utilities, plant scale) on the process economics have been evaluated. The direct dimethyl ether synthesis route processing a syngas with H-2/CO = 1 and using the Rectisol process for CO2 capture has the highest overall thermal efficiency on the lower heat value basis of all combinations studied in this work. The equivalent diesel price of the direct dimethyl ether synthesis process is found to be much lower than the current U.S. market diesel price indicating the feasibility of the process.
机译：通过具有合成气H-2 / CO = 1的直接合成路线的页岩气制二甲醚工艺比通过间接合成路线的工艺具有更高的二甲醚产率。但是，直接合成路线涉及各种能源和资本密集型过程，例如复杂的二甲醚分离过程以及CO2循环和压缩过程。在这项研究中，基于Aspen Plus开发的严格过程模型，使用Aspen Process Economic Analyzer对页岩气通过直接和间接合成路线进行二甲醚工艺的技术经济分析。评估了不同的二氧化碳去除技术和合成气合成二甲醚的效果。在严谨的过程模型中，直接和间接工厂都在Aspen Plus方程式环境中进行了优化。评估了关键设计参数（即合成气中的HZ / CO）以及投资参数（即原材料，产品和公用事业的价格，工厂规模）对过程经济性的影响。在这项工作中研究的所有组合中，在较低的热值基础上，直接处理H-2 / CO = 1的合成气并使用Rectisol工艺进行CO2捕集的直接二甲醚合成路线具有最高的总热效率。发现直接二甲醚合成方法的当量柴油价格比当前美国市场上的柴油价格低得多，表明该方法的可行性。

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