Quadruple point determination in carbon dioxide hydrate forming system
Quadruple point determination in carbon dioxide hydrate forming system
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DOI：
10.1016/j.fluid.2016.12.014
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发表时间：
2017-06-15
影响因子：
2.6
通讯作者：
Yasuda, Keita
中科院分区：
文献类型：
--
作者：
Nema, Yuki;Ohmura, Ryo;Yasuda, Keita
二氧化碳水合物形成体系的四点冰+富水液体+水合物+富二氧化碳气体四相平衡条件，是根据本研究测得的过冷富水液体+水合物+富二氧化碳气体和富水液体+水合物+富二氧化碳气体三相平衡条件，结合文献报道的冰+水合物+富二氧化碳气体三相平衡条件(K. Yasuda，R. Ohmura， J. Chem。Eng。数据53(2008)2182-2188)。采用三种三相平衡条件的交点来确定四点位。实验温度为269.45 ~ 275.75 K，压力为0.825 ~ 1.708 MPa。测定的四点p-T条件为T = 271.6 +/- 0.2 K, p = 1.04 +/- 0.02 MPa。还观察到，在一些低于四点温度的实验运行中，过冷水冻结，导致压力和温度突然升高。(C) 2016 Elsevier B.V.版权所有
The quadruple point in carbon dioxide hydrate forming system, ice + water-rich liquid + hydrate + carbon dioxide-rich gas four-phase equilibrium condition, has been determined based on supercooled water-rich liquid + hydrate + carbon dioxide-rich gas and water-rich liquid + hydrate + carbon dioxide-rich gas three-phase equilibrium conditions measured in this study combined with ice + hydrate + carbon dioxide-rich gas three-phase equilibrium conditions reported in the literature (K. Yasuda, R. Ohmura, J. Chem. Eng. Data 53 (2008) 2182-2188). The intersection of the three types of the three-phase equilibrium conditions was used to determine the quadruple point. The three-phase equilibrium condition experiments were performed at temperatures between 269.45 K and 275.75 K, and at pressures between 0.825 MPa and 1.708 MPa. The determined p-T condition at quadruple point was T = 271.6 +/- 0.2 K and p = 1.04 +/- 0.02 MPa. It was also observed that the freezing of supercooled water during some experimental runs performed below the quadruple point temperature, which causes sudden increase in both pressure and temperature. (C) 2016 Elsevier B.V. All rights reserved.