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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Nucleation Curve of Carbon Dioxide Hydrate from a Linear Cooling Ramp Method
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Nucleation Curve of Carbon Dioxide Hydrate from a Linear Cooling Ramp Method

机译：二氧化碳水合物与线性冷却斜坡法的成核曲线

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Formation of gas hydrate is a first-order phase transition that starts with nucleation. Understanding of nucleation is of interest to many in chemical and petroleum industries, as nucleation, while beneficial in many chemical processes, is detrimental in flow assurance of oil and natural gas pipelines. A primary difficulty in the investigation of gas hydrate nucleation has been the inability of researchers to compare nucleation rates of gas hydrates across various systems of different scales and complexities, which in turn has been limiting the ability of researchers to study the nucleation process itself. In this study, a first-generation high-pressure automated lag time apparatus (HP-ALTA MU) was used to determine the nucleation curve of structure I (sI) - forming carbon dioxide hydrate. The instrument subjected a quiescent water sample of well-defined dimensions to a large number of linear cooling ramps under isobaric conditions, and detected and recorded carbon dioxide hydrate formation temperature distributions. A survival curve was constructed from the measured ensemble, and a nucleation curve was derived from the survival curve using the empirical model-independent method we had previously reported. The nucleation rate of carbon dioxide hydrate was found to be significantly greater than that of pure methane hydrate or that of natural gas hydrate over the entire range of subcooling investigated. We provide a new physical interpretation of an experimentally determined nucleation curve and, by doing so, solve one of the outstanding puzzles of the HP-ALTA technology.
机译：气体水合物的形成是与成核开始一阶相变。核的了解感兴趣的是，在许多化学和石油工业，核，而在许多化学过程是有益的，是在石油和天然气管道的流量保证有害的。天然气水合物的成核研究的主要困难一直是研究人员无法比较不同规模和复杂性，这反过来又限制了研究人员的研究成核过程本身的能力的各种系统天然气水合物的成核速率。在这项研究中，第一代高压自动化滞后时间装置（HP-ALTA MU）被用于确定结构的成核曲线I（SI） - 形成二氧化碳水合物。该仪器进行良好限定的尺寸的静止水样到大量的线性等压条件下冷却坡道，以及检测和记录二氧化碳水合物形成温度分布。甲生存曲线从所测量的合奏构造和成核曲线使用我们以前报道的经验模型无关的方法的存活曲线的。二氧化碳水合物的成核速率被认为是比纯甲烷水合物或天然气水合物过的过冷所研究的整个范围的显著更大。我们提供了一个实验确定核曲线的新的物理解释，并通过这样做，解决了HP-ALTA技术的杰出难题之一。

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