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Exergy-based sustainability analysis of acetins synthesis through continuous esterification of glycerol in acetic acid using Amberlyst®36 as catalyst
Journal of Cleaner Production ( IF 9.7 ) Pub Date : 2018-02-23
Mortaza Aghbashlo, Meisam Tabatabaei, Hajar Rastegari, Hassan S. Ghaziaskar

This research was devoted to investigating the exergetic performance of a continuous reactor applied to valorize glycerol through esterification with acetic acid in the presence of Amberlyst®36 as catalyst. The main aim of the current study was to evaluate the effects of reaction temperature (66–134 °C), acetic acid to glycerol molar ratio (1–9), and pressure (1–199 bar) at a fixed feed flow rate of 0.5 mL/min on the exergetic performance parameters of the reactor. The developed reactor satisfactorily converted glycerol into acetins, i.e., monoacetin, diacetin, and triacetin. The exergetic performance parameters of the reactor were profoundly influenced by the process variables. In general, reaction temperature of 80 °C, acetic acid to glycerol molar ratio of 3, and pressure of 41 bar were found to be the most optimal glycerol esterification conditions from the exergetic viewpoint. Under these conditions, functional exergetic efficiency and exergetic productivity index of the process stood at 25.38% and 0.42%, respectively. The results obtained showed that selection of the esterification conditions based on yield alone could be misleading, since high-yield chemical operations might potentially destroy large amounts of resources as a result of thermodynamic irreversibilities. Overall, the best operating conditions determined herein can be applied in commercial scale for efficient, productive, and sustainable valorization of glycerol into value-added acetins.



中文翻译:

通过在乙酸甘油的连续酯化使用的Amberlyst醋精合成的基于有效能-可持续性分析® 36作为催化剂

这项研究是专门调查连续反应器的火用性能施加通过与大孔树脂的存在下在乙酸酯化使其增值甘油®36作为催化剂。当前研究的主要目的是评估在固定进料流量下,反应温度(66–134°C),乙酸与甘油的摩尔比(1–9)和压力(1–199 bar)的影响。反应器的高能性能参数为0.5 mL / min。所开发的反应器令人满意地将甘油转化为乙酸甘油酯,即单乙酸甘油酯,双乙酸甘油酯和三乙酸甘油酯。工艺变量极大地影响了反应器的性能参数。通常,从能动性的观点出发,发现反应温度为80℃,乙酸与甘油的摩尔比为3,压力为41bar是最优选的甘油酯化条件。在这些条件下,该方法的功能能效效率和能效生产率指数分别为25.38%和0.42%。获得的结果表明,仅根据收率选择酯化条件可能会产生误导,因为高收率的化学操作可能由于热力学不可逆性而破坏大量资源。总体而言,本文确定的最佳操作条件可以以商业规模应用,以将甘油有效,生产性和可持续地增值成增值的乙酸甘油酯。

更新日期:2018-02-23
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