Abstract Kinetics of hydrate formation and dissociation of carbon dioxide studied through experiments carried out at isothermal-isobaric condition in a constant stirred tank reactor (CSTR). Experiments performed at different temperatures and pressure levels. Constant rates of CO2 mole consumption and mole production observed during hydrate formation and dissociation experiments. Accordingly, mass transfer limited hydrate kinetic models were used and mass transfer coefficients for CO2 hydrate formation and dissociation evaluated. It was found that mass transfer coefficients for CO2 hydrate dissociation are one order of magnitude larger than mass transfer coefficients for hydrate formation. The fact indicates that CO2 hydrate dissociation takes faster than formation. The evaluated mass transfer coefficient for CO2 hydrate formation and dissociation correlated as functions of temperature and pressure. The results can be applied for numerical modeling of underground storage of CO2 and simulation of hydrate based CO2 capture processes.

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二氧化碳水合物形成和解离动力学的实验研究和建模：传质受限动力学方法

摘要 通过在恒定搅拌釜反应器 (CSTR) 中在等温-等压条件下进行的实验研究了二氧化碳的水合物形成和分解动力学。在不同温度和压力水平下进行的实验。在水合物形成和解离实验中观察到的 CO2 摩尔消耗和摩尔产生的恒定速率。因此，使用了传质受限的水合物动力学模型，并评估了 CO2 水合物形成和分解的传质系数。发现 CO2 水合物分解的传质系数比水合物形成的传质系数大一个数量级。事实表明，CO2 水合物的分解比形成更快。评估的 CO2 水合物形成和分解的传质系数与温度和压力的函数相关。结果可用于二氧化碳地下储存的数值模拟和基于水合物的二氧化碳捕集过程的模拟。