Phase behavior for carbon dioxide/tetraalkoxysilane systems

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• 作者：Takeshi Hamada^a ; Daisuke Kobayashi^b ; Tomoki Takahashi^b ; Atsushi Shono^b ; Katsuto Otake^b ; ^{k-otake@ci.kagu.tus.ac.jp} ; Tomoya Tsuji^c ; Satoshi Yoda^d ; Takeshi Furuya^d
• 关键词：Vapor&ndash ; liquid equilibrium ; Peng&ndash ; Robinson equation of State ; Tetramethoxysilane ; Tetraethoxysilane ; Carbon dioxide
• 刊名：Fluid Phase Equilibria
• 出版年：2012
• 期刊代码：32_03783812
• 类别：ce
• 出版时间：25 May, 2012
• 卷：322-323
• 期：Complete
• 页码：135-141
• 文件大小：699 K

摘要

Phase diagrams of carbon dioxide (CO₂)/tetramethoxysilane (TMOS) and CO₂/tetraethoxysilane (TEOS) binary systems were measured. Liquid phase measurements were performed by observing the bubble point pressure with a synthetic method. Vapor phase measurements were conducted with a flow type apparatus. For the CO₂/TMOS system, liquid phase lines were measured at temperatures from 313.2 to 393.2 K, and CO₂ molar fractions from 0.15 to 0.85, and vapor phase lines were obtained at temperatures 313.2, 353.2 and 393.2 K and pressures up to 12 MPa. For the CO₂/TEOS system, measurements were conducted only for liquid phase lines at temperatures from 313.2 to 373.2 K and CO₂ molar fractions from 0.25 to 0.75. Phase behavior of these two systems was almost the same with each other. Experimental data were correlated with the Peng-Robinson equation of state (PR EoS), and the molecular interaction parameter k_ij and l_ij for both systems were determined. For large difference in the molecular size of CO₂ and tetraalkoxysilanes, it was found that the l_ij could be negligible.