Scale-up analysis of the oxidative dehydrogenation of ethane over MoVTeNbOx catalysts in an autothermal reactor
Scale-up analysis of the oxidative dehydrogenation of ethane over MoVTeNbOx catalysts in an autothermal reactor
复制标题
自热反应器中 MoVTeNbOx 催化剂上乙烷氧化脱氢的放大分析
DOI：
10.1016/j.ces.2023.118649
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发表时间：
2023
影响因子：
4.7
通讯作者：
Balakotaiah, Vemuri
中科院分区：
文献类型：
--
作者：
Chen, Jiakang;Sun, Zhe;Bollini, Praveen;Balakotaiah, Vemuri
我们使用一维有限热分散模型研究乙烷氧化脱氢 (ODHE)，并对绝热自热反应器中的过程进行全面的点火-熄灭分析。放大研究中使用的六步动力学模型源自实验室规模的反应器数据，并在广泛的实验条件下进行了验证。我们研究了乙烷与氧气的进料比、时空和床长度对自热操作区域的影响，作为进料温度的函数。结果表明，乙烷转化率和乙烯选择性在消光点不是单调的，并且存在一组最佳的设计和操作条件。我们还报告了工作压力对固定线速度和质量速度的影响。我们的分析和比较表明，ODHE 在高压下运行时可能会产生与乙烷蒸汽裂化工艺相当的性能。
We examine the oxidative dehydrogenation of ethane (ODHE) using a one-dimensional finite heat dispersion model and present a comprehensive ignition-extinction analysis of the process in an adiabatic autothermal reactor. The six-step kinetic model used in the scale-up studies was derived from lab-scale reactor data and validated over a wide range of experimental conditions. We investigate the impact of ethane to oxygen feed ratio, space time, and bed length on the region of autothermal operation as a function of feed temperature. The results reveal that ethane conversion and ethylene selectivity are not monotonic at the extinction point and there exists an optimum set of design and operating conditions. We also report the impact of operating pressure in terms of fixed linear and mass velocities. Our analysis and comparisons show that ODHE, when operated at high pressure, may lead to performance that is comparable to the ethane steam cracking process.