作为sII型气体水合物绿色热力学抑制剂的尿素的相平衡和粉末X射线衍射研究数据集。
Dataset for the phase equilibria and PXRD studies of urea as a green thermodynamic inhibitor of sII gas hydrates.
作者信息
Semenov Anton P, Gong Yinghua, Mendgaziev Rais I, Stoporev Andrey S, Vinokurov Vladimir A, Li Tianduo
机构信息
Shandong Provincial Key Laboratory of Molecular Engineering, School of Chemistry and Chemical Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, PR China.
Gubkin University, Department of Physical and Colloid Chemistry, 65, Leninsky prospekt, Building 1, Moscow 119991, Russian Federation.
出版信息
Data Brief. 2023 Jun 10;49:109303. doi: 10.1016/j.dib.2023.109303. eCollection 2023 Aug.
The equilibrium conditions of sII methane/propane hydrates have been experimentally determined for the CH/CH-HO-urea system. The equilibrium dissociation temperatures and pressures of sII hydrates span a wide -range (266.7-293.9 K; 0.87-9.49 MPa) and were measured by varying the feed mass fraction of urea in solution from 0 to 50 mass%. The experimental points at feed urea concentration ≤ 40 mass% correspond to the V-L-H equilibrium (gas-aqueous urea solution-gas hydrate). A four-phase V-L-H-S equilibrium (with an additional phase of solid urea) was observed because the solubility limit of urea in water was reached for all points at a feed mass fraction of 50 mass% and for one point at 40 mass% (266.93 K). Gas hydrate equilibria were measured using a high-pressure rig GHA350 under isochoric conditions with rapid fluid stirring and slow ramp heating of 0.1 K/h. Each measured point represents complete dissociation of the sII hydrate. The phase equilibrium data was compared with the literature reported for the CH/CH-HO and CH-HO-urea systems. A comprehensive analysis of the thermodynamic inhibition effect of urea to sII CH/CH hydrates on pressure and concentration of the inhibitor was carried out. The phase composition of the samples was analyzed by powder X-ray diffractometry at 173 K.
已通过实验确定了 CH₄/C₃H₈-H₂O-尿素体系中 sII 型甲烷/丙烷水合物的平衡条件。sII 型水合物的平衡解离温度和压力范围很广（266.7 - 293.9 K；0.87 - 9.49 MPa），通过将溶液中尿素的进料质量分数从 0 变化到 50 质量%来进行测量。进料尿素浓度≤40 质量%时的实验点对应于 V-L-H 平衡（气相-尿素水溶液-气体水合物）。观察到了四相 V-L-H-S 平衡（还有一个固体尿素相），因为在进料质量分数为 50 质量%时的所有点以及在 40 质量%（266.93 K）时的一个点都达到了尿素在水中的溶解度极限。使用高压装置 GHA350 在等容条件下，通过快速流体搅拌和 0.1 K/h 的缓慢升温来测量气体水合物平衡。每个测量点代表 sII 型水合物的完全解离。将相平衡数据与 CH₄/C₃H₈-H₂O 和 CH₄-H₂O-尿素体系的文献报道进行了比较。对尿素对 sII 型 CH₄/C₃H₈ 水合物的热力学抑制作用在抑制剂压力和浓度方面进行了全面分析。在 173 K 下通过粉末 X 射线衍射法分析了样品的相组成。
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