Fundamental study of impurities influence on hydrate nuclaeation

这对提取氢化核的知识很重要，不仅适用于氢化基场，也适用于工程和工业场。However the knowledge of hydrate nucation is lacked due to the differiculty of formation of hydrate even under the suitable pressure and temperature conditions on the phase diagram experimentally。The objective of the present study is to elucidate the conditions which influence on hydrate nucation。在这项研究中，我们使用了与海洋有关的液体CO_2作为客人和测量了在各种环绕水条件下作为宿主（温度、分解CO_2浓度和初始H_2O集群）的诱导时间，我们测量了从液体CO_2滴进入压力室（30 MPa， 3 - 5℃）的时间，形成水合物薄膜。分解CO_2浓度、室内温度和洗涤时间之间的关系得到了评估，并得到了后续结果。CO_2之间的关系 ... More 欺骗和诱导的时间是不确定的。有一种趋势，即较低的温度和较大的体积，由于浇注时间较短，我们浇注了Liquid CO_2滴，并测量了在主机的水的温度和压力历史上发生了变化， （初始H_2O集群已经发生了变化）我们得到了以下的结果。在使用水的情况下，水以前在大气压力和低温下留下，水形成是很难被观察到的。在使用水的情况下，它以前在大气压力下结冰和融化，水的形成是不可观察的。在使用水的情况下，它以前在水形成压力下结冰和融化，水形成已被识别。在增加淡化水的重量比率时，已发生变化。“熔化水的体积较大导致了吸收时间的缩短。从以上的知识来看，我们采用了CO_2浓度在该研究的CO_2浓度范围内对水核的严重影响，以及H_2O簇的宿主水侧面可能对水核的严重影响。”Less（低）

It is important to elucidate the knowledge of hydrate nucleation for not only hydrate basic field but also engineering and industrial field. However the knowledge of hydrate nucleation is lacked due to the difficulty of formation of hydrate even under the suitable pressure and temperature conditions on the phase diagram experimentally.The objective of the present study is to elucidate the conditions which influence on hydrate nucleation. In this study, we used the liquid CO_2 related to the ocean as a guest and measured the induction time under the various conditions of the surrounding water as a host (temperature, dissolved CO_2 concentration, and initial H_2O cluster)We measured the time from putting liquid CO_2 droplet into the pressure chamber (30MPa, 3〜5℃) to forming the hydrate film. Relationship between dissolved CO_2 concentration, water temperature in the chamber and induction time was evaluated respectively and following results were obtained.・The relation between CO_2 concen … More tration and induction time wasn't confirmed.・There is the tendency that the lower temperature and the larger volume of putted liquid CO_2 droplet cause the shorter the induction time.We putted liquid CO_2 droplet and measured the induction time after the temperature and pressure history of a host water side have been changed, (Initial H_2O cluster have been changed) We obtained following results.・In the case of using the water that had previously left under the atmospheric pressure and low temperature, hydrate formation was hardly observed.・In the case of using the water that had previously frozen as ice and melted at atmospheric pressure, hydrate formation was not observed.・In the case of using the water that had previously frozen as ice and melted at hydrate formation pressure, hydrate formation was identified. In addition the ratio of melted water weight was changed. The lager quantity of melted water causes the shorter the induction time.From above knowledge, we elucidated that CO_2 concentration hardly influence on hydrate nucleation in the range of CO_2 concentration of this study and the condition of H_2O cluster of the host water side may influence on hydrate nucleation greatly. Less