High pressure vapour-liquid equilibria for the mixture DL-γ-tocopherol/methanol

被引:4
作者
Crevatin, A
Steiner, K
Kikic, I
机构
[1] Univ Trieste, Chem Environm & Rae Mat Engn Dept, DICAMP, I-34127 Trieste, Italy
[2] F Hoffmann La Roche & Co Ltd, High Pressure Ctr, CH-4070 Basel, Switzerland
关键词
vapour-liquid equilibria; equation of state; DL-gamma-tocopherol; methanol;
D O I
10.1016/S0378-3812(99)00045-X
中图分类号
O414.1 [热力学];
学科分类号
摘要
DL-gamma-Tocopherol is one of the four homologues compounds also known as vitamin E. Tocopherols are present in all four forms (alpha-, beta-, gamma-, delta-tocopherol) in many natural sources and extraction design of purification processes used for their enrichment needs detailed knowledge of the phase equilibrium behaviour. Experimental vapour-liquid equilibrium data (pressure-composition isotherms) for the binary system DL-gamma-tocopherol/methanol at four temperatures 473 K, 498 K, 523 K, 543 K and pressures up to 12 MPa are presented. The measurements were carried out in a static constant volume high-pressure apparatus. Different cubic equations of state and mixing rules were used to model the data. A modified Redlich-Kwong-Soave EOS gives the better correlation. On the basis of the new experimental data and those for the system DL-alpha-tocopherol/methanol and reasonable agreement between the two systems, using for both the same thermodynamic model, behaviour of the ternary system DL-alpha-tocopherol/DL-gamma-tocopherol/methanol has been predicted. (C) 1999 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:103 / 109
页数:7
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