Phase behavior of the carbon dioxide/toluene/poly(methyl methacrylate) ternary system

被引:2
|
作者
Matsukawa, Hiroaki [1 ]
Tachibana, Takumi [2 ]
Suzuki, Ryota [2 ]
Otake, Katsuto [1 ]
机构
[1] Tokyo Univ Sci, Fac Engn, Dept Ind Chem, Niijuku 6-3-1,Katsushika Ku, Tokyo 1258585, Japan
[2] Tokyo Univ Sci, Grad Sch Engn, Dept Ind Chem, Niijuku 6-3-1,Katsushika Ku, Tokyo 1258585, Japan
关键词
Vapor -liquid equilibrium; Carbon dioxide; Toluene; Poly(methyl methacrylate); Laser turbidimetry; ACRYLATE) PLUS COSOLVENT; SOLUBILITY PARAMETERS; SANCHEZ-LACOMBE; STATISTICAL THERMODYNAMICS; VOLUMETRIC PROPERTIES; INTERNAL-PRESSURE; ETHANOL MIXTURES; CLOUD-POINT; DIOXIDE; EQUILIBRIA;
D O I
10.1016/j.fluid.2024.114153
中图分类号
O414.1 [热力学];
学科分类号
摘要
Carbon dioxide/organic polymer/solvent systems have several industrial applications, including supercritical polymerization. Various process parameters affect the phase behavior of these systems, thereby influencing the process design. Accordingly, the phase behavior of a carbon dioxide (CO 2 )/toluene (Tol)/poly(methyl methacrylate) (PMMA) ternary system was investigated in this study. Measurements were performed using a synthetic method combined with laser displacement and turbidity measurement. Bubble points (vapor - liquid phase separation) were determined from changes in the piston displacement, whereas cloud points (liquid - liquid (LL) phase separation) were determined from changes in the turbidity The phase boundaries of CO 2 mass fractions ranging from 0.098 to 0.577 were measured by varying the Tol/PMMA ratio. The homogeneous phase area decreased when the ratio of PMMA to Tol increased, molecular weight of PMMA increased, and/or temperature decreased. These changes in the LL phase separation behavior were explained with reference to the free volume ( v f ) and solubility parameter ( delta ) estimated using the Sanchez - Lacombe equation of state. The estimation of v f and delta is expected to be helpful in comprehensively understanding the phase diagram and in predicting the phase behavior of CO 2 /organic solvent/polymer systems.
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页数:13
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