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UNIVERSAL LIQUID MIXTURE MODELS FOR VLE AND LLE IN HEXANE-BUTANOL-WATER STSTEM. Wahid Islam Department of Chemical Engineering, North Carolina A&T State University MS Thesis Defense 06/26/09 607, McNair Conference Room Committee Members: Dr. Vinayak Kabadi
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Department of Chemical Engineering, North Carolina A&T State University
MS Thesis Defense
607, McNair Conference Room
Dr. Vinayak Kabadi
Dr. Shamsuddin Ilias Major Professor: Dr. Vinayak Kabadi
Dr. John Kizito
The main objective is to get a single set of parameters of a universal liquid mixture model for Hexane-Butanol-Water system by which all kinds of binary phase equilibrium data(Mutual Solubility, VLE, γ∞) and ternary LLE data for a wide concentration range can be calculated within reasonable error.
A number of ternary systems have been investigated from literature. There are some very non ideal systems for which finite data and infinite dilution distribution coefficient can not be measured simultaneously by UNIQUAC model. This model show order of magnitude difference between experimental and calculated Dsw for these systems. Example of these systems are
Two parameter models:
LSG(Local Surface Guggenheim)
and so on
Three parameter models:
Here, interacton parameter, and ,
**average of values marked with * which is our final value
** average of values marked with * which is our final value
(Evaluation of 3rd parameter of three parameter models)
(Selecting appropriate 3rd parameter of GEM-RS for Hexane-Water)
(Overall results by NRTL)
(Overall results by GEM-RS)
Parameters of 25 C have been taken as reference parameters. Temperature dependent functions of interaction parameters are as follows:
All kinds of phase equilibrium data(solubility, γ∞, VLE) , excess enthalpy(HE ) data have been collected from as many sources as possible. HE data have been used because,
NRTL/GEM-RS(three parameter models) are the universal model for Hexane-Butanol-Water system because these models can,