Vapor-liquid equilibrium model for a partially miscible multicomponent system: isopropanol-acetone-ethanol-n-butanol-water
Normal butanol, a potential diesel fuel additive, can be produced by the fermentation of paper pulp waste streams by Clostridia with isopropanol, acetone, and ethanol produced as byproducts. To design a distillation process for the recovery of n-butanol from fermentation broth, the vapor-liquid equilibria for the multicomponent system isopropanol-acetone-ethanol-n-butanol-water were modeled using Wilson equations to predict liquid activity coefficients. An extra parameter was added to the Wilson correlation to allow for the partial miscibility between butanol and water. The accuracy of the model was tested by comparing the predicted vapor composition with experimentally obtained values in the immiscible region. Even with the extra parameter, the model did not predict a miscibility gap between n-butanol and water, and the vapor-liquid equilibria were predicted with an accuracy of +- 0.15 mol fraction.
- Research Organization:
- Oak Ridge National Lab., TN (USA)
- DOE Contract Number:
- W-7405-ENG-26
- OSTI ID:
- 5355685
- Report Number(s):
- ORNL/MIT-310
- Country of Publication:
- United States
- Language:
- English
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ACETONE
ALCOHOLS
BACTERIA
BIOCONVERSION
BUTANOLS
CLOSTRIDIUM
DISPERSIONS
DISTILLATION
EQUILIBRIUM
ETHANOL
FERMENTATION
FLUIDS
GASES
HYDROGEN COMPOUNDS
HYDROXY COMPOUNDS
KETONES
LIQUIDS
MATHEMATICAL MODELS
MICROORGANISMS
MIXTURES
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
SEPARATION PROCESSES
SLURRIES
SOLUBILITY
SUSPENSIONS
VAPORS
WATER