High pressure phase equilibrium for binary system dl-α tocopherol plus methanol

被引:13
作者
Crevatin, A
Zwahlen, A
Kikic, I [1 ]
机构
[1] Univ Trieste, DICAMP, I-34127 Trieste, Italy
[2] Hoffmann La Roche Ag, High Pressure Ctr, CH-4070 Basel, Switzerland
关键词
VLE; alpha-tocopherol; methanol; carbon dioxide;
D O I
10.1016/S0896-8446(98)00079-5
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Pressure-composition isotherms for the system dl-alpha-tocopherol/methanol were measured, at four temperatures between 473.15 and 543.15 K and pressures up to 115 bar. The measurements were carried out using a constant volume static apparatus. For this system the isothermal curves reveal a regular pattern of behaviour. The experimental data, together with the system dl-alpha-tocopherol/carbon dioxide literature data were modelled with cubic equations of state using different mixing rules; the modified Redlich-Kwong-Soave model provided the better agreement with the experimental data for both systems. The results obtained for the system dl-alpha-tocopherol/carbon dioxide were compared with those reported in the literature. On the basis of the new experimental data and those of the literature and using a thermodynamic model, the behaviour of the ternary system dl-alpha-tocopherol/methanol/carbon dioxide was predicted. (C) 1998 Elsevier Science B.V.
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页码:99 / 108
页数:10
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