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Intensification of 2-Methyl-1,3-Dioxolane hydrolysis for recovery of ethylene glycol through reactive distillation: Kinetics and process design
Chemical Engineering and Processing: Process Intensification ( IF 4.3 ) Pub Date : 2020-06-24 , DOI: 10.1016/j.cep.2020.108012
Xingang Li , Yan Wu , Hong Li , Guomin Yuan , Hao Chen , Xin Gao

Chemical Looping technology, which consist of aldolization and hydrolysis processes, is proved as a potential and effectively method to separate ethylene glycol (EG) in the coal-based EG production process. However, the problem of acetal hydrolysis is that this reaction is hindered by the boiling points ranking and the chemical equilibrium limitations, which is not the most favorable. In this paper, a potentially sustainable reactive distillation (RD) process is presented for intensification of hydrolysis of 2-Methyl-1,3-Dioxolane (2MD). To accurate design the RD process, the hydrolysis kinetics was measured and a regressed pseudo homogeneous model showed good agreement with experiments. Furthermore, an applicable reactive distillation model was proposed to analyzing the effect of pressure, feed ratio, feed position, reflux ratio, number of reaction plates, rectification plates and stripping plates on the energy consumption and 2MD conversion. Results show that the designed RD process will shift the conventional hydrolysis process towards completion with a 2MD conversion higher than 99.9 %, even without high excess water. The obtained results could give a guide for the pilot scale of recovery EG in coal-based EG production process.



中文翻译:

通过反应蒸馏强化2-甲基-1,3-二氧戊环水解以回收乙二醇的动力学和工艺设计

事实证明,由醛醇化和水解过程组成的化学环化技术是一种在煤基EG生产过程中分离乙二醇(EG)的潜在且有效的方法。然而,缩醛水解的问题是该反应受沸点等级和化学平衡限制的阻碍,这不是最有利的。在本文中,提出了一种潜在的可持续反应蒸馏(RD)工艺,用于增强2-甲基-1,3-二氧戊环(2MD)的水解。为精确设计RD工艺,测量了水解动力学,回归假均相模型与实验结果吻合良好。此外,提出了适用的反应蒸馏模型,以分析压力,进料比,进料位置,回流比,反应板数,精馏板和汽提板的能耗和2MD转换。结果表明,设计的RD工艺将使常规水解工艺朝着完全转化的方向发展,即使没有大量过量的水,其2MD转化率也高于99.9%。所得结果可为煤基EG生产过程中回收EG的中试规模提供指导。

更新日期:2020-06-24
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