Recently, hydrate technology as a newly emerging field has been attracting more and more attention. To support its potential applications, the dissociation behaviors and kinetics of CO₂ hydrate in pure water and water/sediments systems at specified temperatures were studied experimentally by depressurization method. This work reveals two novel aspects of CO₂ hydrate dissociation. Firstly, it is remarkable that the dissociation rate of CO₂ hydrate in water/sediments is faster than that of CO₂ hydrate in pure water, which has not been conscious previously. Secondly, a pseudo first‐order kinetic equation including the kinetic constant and activation energy was formulated to describe the dissociation process. Temperature plays an important role and the dissociation rate constant ( $k_d$) and activation energy ( $\mathrm{\Delta }{E}_a$) were obtained through the dissociation experiments at different temperatures. For CO₂ hydrate in pure water, the dissociation rate constant increased from 0.02 to 0.13 mol/(dm²⋅MPa⋅min) at the temperature from 273.86 to 276.11 K, and the activation energy was 469.06 kJ mol⁻¹. For CO₂ hydrate in water/sediments, the dissociation rate constant was from 0.03 to 0.15 mol/(dm²⋅MPa⋅min) at the temperature ranging from 273.45 to 276.11 K, and the activation energy was 346.30 kJ mol⁻¹. © 2021 Society of Chemical Industry and John Wiley & Sons, Ltd.

中文翻译：

---

纯水和水/泥沙体系中CO2水合物原位离解动力学的实验研究

近年来，水合物技术作为新兴领域受到越来越多的关注。为了支持其潜在的应用，通过减压方法实验研究了在指定温度下纯水和水/沉积物系统中CO ₂水合物的离解行为和动力学。这项工作揭示了CO ₂水合物离解的两个新颖方面。首先，值得注意的是，CO的解离速率₂水合物在水/沉积物比CO的快₂在纯净水中水合，以前没有意识到。其次，建立了一个包含动力学常数和活化能的伪一阶动力学方程来描述解离过程。温度起着重要作用，解离速率常数（${ķ}_d$）和活化能（ $\mathrm{\Delta }{E}_{\mathrm{一种}}$通过在不同温度下的解离实验获得）。对于CO ₂在纯水中水合，解离速率常数从0.02提高到0.13摩尔/（DM ²在温度⋅MPa⋅min）从273.86到276.11 K，且活化能为469.06千焦摩尔^-1。对于水/沉积物中的CO ₂水合物，在273.45至276.11 K的温度下，解离速率常数为0.03至0.15 mol /（dm ² MPaMPa·min），活化能为346.30 kJ mol ^-1。©2021化学工业协会和John Wiley＆Sons，Ltd.