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首页> 外文会议>Clearwater clean coal conference;International technical conference on clean energy >Chemical Looping Oxidative Dehydrogenation: A Greener Route to Ethylene Production
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Chemical Looping Oxidative Dehydrogenation: A Greener Route to Ethylene Production

机译：化学环氧化脱氢：乙烯生产的绿色路线

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Steam cracking is the main process to produce ethylene from ethane, which requires a high furnace temperature (up to 1100°C) and a large steam generation load, making it highly energy intensive (17-21 GJ/tonne ethylene). The process also emits significant amount of NO_x and CO_2 and requires periodic shutdowns for coke burnout. Oxidative dehydrogenation of ethane (ODH) is an alternative, where ethane is partially oxidized into ethylene and water. The oxidation of hydrogen makes the ODH reaction exothermic, thereby reducing the fuel consumption while overcoming the equilibrium limitations for cracking reactions. However, safety concerns with the fuel-oxygen mixture and capital intensive oxygen generation are major drawbacks. We propose a chemical-looping ODH (CL-ODH) approach that can address these issues. We have identified Mg_6MnO_8, a mixed oxide to be an excellent model redox catalyst for ODH, giving high ethylene yield while providing the heat required for the endothermic dehydrogenation reactions. CL-ODH of ethane is modeled using ASPEN Plus® and is compared with a conventional stream cracking process. Results show that CL-ODH with 85% ethane conversion provides over 80% reduction in the overall energy demand with >80% reduction in the overall CO_2 emissions. Preliminary results from CHEMKIN-PRO® are in agreement with literature values in terms of product compositions for ethane cracking.
机译：蒸汽裂化是从乙烷生产乙烯的主要过程，该过程需要较高的炉温（最高1100°C）和较大的蒸汽产生负荷，使其非常耗能（17-21 GJ /吨乙烯）。该过程还会排放大量的NO_x和CO_2，并且需要定期关闭以燃尽焦炭。乙烷的氧化脱氢（ODH）是一种替代方法，其中乙烷被部分氧化为乙烯和水。氢的氧化使ODH反应放热，从而减少了燃料消耗，同时克服了裂化反应的平衡限制。但是，燃料-氧气混合物的安全性问题和资本密集型氧气的产生是主要缺点。我们提出了一种化学循环ODH（CL-ODH）方法，可以解决这些问题。我们已经确定Mg_6MnO_8是一种混合氧化物，是ODH的优良模型氧化还原催化剂，可提供高的乙烯收率，同时提供吸热脱氢反应所需的热量。使用ASPENPlus®对乙烷的CL-ODH进行建模，并将其与常规的流裂化工艺进行比较。结果表明，乙烷转化率为85％的CL-ODH可将总能源需求降低80％以上，而将整体CO_2排放量降低> 80％。 CHEMKIN-PRO®的初步结果与乙烷裂解的产品组成方面的文献值一致。

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