Abstract

A number of process solutions for one-step synthesis of dimethyl ether (DME), including a step of its recovery from the gaseous and liquid phases, were reviewed. It was demonstrated that energy-intensive absorption is the most common method for DME recovery from a gaseous stream containing syngas components. It was also shown that the world licensors of one-step DME synthesis provide for an additional dehydration reactor to utilize the methanol co-product. Energy and capital intensity was estimated for two DME production options, specifically the methanol dehydration route and the one-step DME synthesis over a bifunctional catalyst. Finally, it was demonstrated that the one-step option is inferior to the two-step design in terms of both criteria, and that the key cost factor is associated with DME recovery from the gaseous phase.

中文翻译：

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一步合成法回收二甲醚的工艺方案及其评价

摘要

综述了一步合成二甲醚（DME）的许多工艺解决方案，包括从气相和液相中回收二甲醚的步骤。结果表明，能量密集型吸收是从含有合成气成分的气流中回收DME的最常用方法。还表明，一步DME合成的世界许可方提供了一个额外的脱水反应器，以利用甲醇副产物。估算了两种DME生产方法的能量和资本强度，特别是甲醇的脱水路线和在双功能催化剂上的一步DME合成。最后，证明了在两个标准方面，一步选择均不如两步设计，并且关键的成本因素与从气相中回收二甲醚有关。