Abstract

Experimental studies of ammonia oxyethylation in a flow microchannel reactor are performed in broad ranges of temperatures (70–180°C) and residence times (0.47–3.3 min). The main products of the reaction between ethylene oxide (EO) and ammonia are monoethanolamine (MEA), diethanolamine (DEA), and target triethanolamine (TEA). It is shown that EO conversion grows along with residence time τ and reaches 90% at τ = 3.3 min. The highest selectivity toward MEA and DEA is observed at a temperature of 70°C and τ = 3.3 min. High selectivity toward TEA (84%) is achieved at short τ (0.47 min) and the maximum temperature (180°C). The TEA yield grows along with temperature and the residence time to reach 62% at τ = 3.3 min and temperatures of 155–180°C. Mathematical modeling of the ammonia oxyethylation process allows the kinetic constants of individual stages to be calculated. Differences between the obtained kinetic parameters and the literature data, due probably to using a microchannel reactor that ensures high parameters of heat and mass transfer instead of a traditional bulk triethanolamine synthesis reactor, are revealed.

中文翻译：

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微通道反应器中催化合成三乙醇胺

摘要

流动微通道反应器中氨氧乙基化的实验研究是在较宽的温度范围（70–180°C）和停留时间（0.47–3.3分钟）内进行的。环氧乙烷（EO）与氨之间反应的主要产物是单乙醇胺（MEA），二乙醇胺（DEA）和目标三乙醇胺（TEA）。结果表明，EO转化率随停留时间τ的增加而增长，在τ= 3.3 min时达到90％。在70°C和τ= 3.3分钟的温度下观察到对MEA和DEA的最高选择性。在短τ（0.47分钟）和最高温度（180°C）下可获得对TEA的高选择性（84％）。在τ= 3.3分钟和155-180°C的温度下，TEA的产率随温度和停留时间的增长而增长，达到62％。氨氧乙基化过程的数学模型允许计算各个阶段的动力学常数。揭示了所获得的动力学参数与文献数据之间的差异，这可能是由于使用了确保高传热和传质参数的微通道反应器而不是传统的本体三乙醇胺合成反应器。