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A Novel Highly Stable Carbon Dioxide Hydrate from a New Synergic Additive Mixture: Experimental and Theoretical Surveys
Journal of Chemical & Engineering Data ( IF 2.0 ) Pub Date : 2022-08-11 , DOI: 10.1021/acs.jced.2c00239 Hussein Hassan 1 , Soheil Zebardast 2 , Jimmy Romanos 1
Journal of Chemical & Engineering Data ( IF 2.0 ) Pub Date : 2022-08-11 , DOI: 10.1021/acs.jced.2c00239 Hussein Hassan 1 , Soheil Zebardast 2 , Jimmy Romanos 1
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Gas hydrate technology is known as an alternative method for natural gas storage. Carbon dioxide hydrate has recently received growing attention due to its many applications. Additives such as cyclohexane (CH) (non soluble in water) and 1,3 dioxolane (DX) (soluble in water) are able to tackle thermodynamic and kinetic imitations of hydrate formation. This study attempts to study the synergic effect of the (DX)/(CH) mixture on the formation conditions of CO2 hydrate systems. These two additives have a promoting effect; however, there is no experimental data on the effect of their mixture in this regard. All experiments were performed by pursuing a constant-volume–pressure search technique with a step heating approach in the pressure, temperature, and the DX mass fraction (w) ranges of (1–55) bar, (280–310) K, and (4.1, 10.1%), respectively. The mixture of DX and CH significantly improved the stability of hydrate formation compared to individual promoters. A thermodynamic framework based on the van der Waals–Platteeuw model was developed to predict the DX/CH–CO2 hydrate phase equilibrium. The Peng–Robinson equation of state was applied to acquire CO2 properties in the gas phase. The DX and CH activity coefficient was obtained through the NRTL model. The results of the proposed model were found to be in satisfactory accordance with the experimental phase equilibrium data with a low discrepancy of 2.83%.
中文翻译：
来自新型协同添加剂混合物的新型高稳定性二氧化碳水合物：实验和理论调查
天然气水合物技术被称为天然气储存的替代方法。二氧化碳水合物由于其许多应用而受到越来越多的关注。环己烷 (CH)（不溶于水）和 1,3 二氧戊环 (DX)（溶于水）等添加剂能够解决水合物形成的热力学和动力学模拟问题。本研究试图研究(DX)/(CH)混合物对CO 2水合物体系形成条件的协同作用。这两种添加剂都有促进作用；然而，没有关于它们的混合物在这方面的影响的实验数据。所有实验都是通过采用恒定体积压力搜索技术进行的，在压力、温度和 DX 质量分数 ( w) 范围分别为 (1–55) bar、(280–310) K 和 (4.1, 10.1%)。与单独的促进剂相比，DX 和 CH 的混合物显着提高了水合物形成的稳定性。开发了一个基于范德华-普拉托模型的热力学框架来预测 DX/CH-CO 2水合物相平衡。应用 Peng-Robinson 状态方程来获取气相中的 CO 2特性。通过NRTL模型获得DX和CH活性系数。发现所提出模型的结果与实验相平衡数据一致，差异低至 2.83%。
更新日期：2022-08-11
中文翻译：
来自新型协同添加剂混合物的新型高稳定性二氧化碳水合物：实验和理论调查
天然气水合物技术被称为天然气储存的替代方法。二氧化碳水合物由于其许多应用而受到越来越多的关注。环己烷 (CH)（不溶于水）和 1,3 二氧戊环 (DX)（溶于水）等添加剂能够解决水合物形成的热力学和动力学模拟问题。本研究试图研究(DX)/(CH)混合物对CO 2水合物体系形成条件的协同作用。这两种添加剂都有促进作用；然而，没有关于它们的混合物在这方面的影响的实验数据。所有实验都是通过采用恒定体积压力搜索技术进行的，在压力、温度和 DX 质量分数 ( w) 范围分别为 (1–55) bar、(280–310) K 和 (4.1, 10.1%)。与单独的促进剂相比，DX 和 CH 的混合物显着提高了水合物形成的稳定性。开发了一个基于范德华-普拉托模型的热力学框架来预测 DX/CH-CO 2水合物相平衡。应用 Peng-Robinson 状态方程来获取气相中的 CO 2特性。通过NRTL模型获得DX和CH活性系数。发现所提出模型的结果与实验相平衡数据一致，差异低至 2.83%。
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