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ABSTRACT
An efficiency-based nonequilibrium model is proposed to simulate two industrial distillation columns. In this model, the behavior of trays is studied by considering the mass transfer at interphase. The interphase mass transfer is simply evaluated by the simultaneous solution of the vapor material balance equation and the definition of the Murphree efficiency. A MATLAB code is developed to implement the simulation procedure. For verification, the product compositions and plate temperatures are compared with the reported experimental data. The discrepancy of the experimental and simulation results is about 0.5% and 20% for the temperature and the product compositions for both columns, respectively.
Nomenclature
| = | vapor flow rate, | |
| = | component vapor flow rate, | |
| = | liquid flow rate, | |
| = | component liquid flow rate, | |
| = | feed flow rate, | |
| = | component feed flow rate, | |
| = | vapor side stream flow rate, | |
| = | vapor dimensionless side-stream flow rate | |
| = | liquid side stream flow rate, | |
| = | liquid dimensionless side-stream flow rate | |
| = | component vapor composition | |
| = | component liquid composition | |
| = | component feed composition | |
| = | enthalpy, | |
| = | heat load, | |
| = | equilibrium constant | |
| = | mass transfer coefficient | |
| = | effective mass transfer area, | |
| = | Murphree vapor phase tray efficiency | |
| = | point efficiency for a tray | |
| = | number of vapor phase transfer units | |
| = | number of liquid phase transfer units | |
| = | number of overall vapor phase transfer units | |
| = | slope of equilibrium curve | |
| = | stripping factor | |
| = | dimensionless Peclet number | |
| = | dimensionless Schmidt number | |
| = | eddy diffusivity, | |
| = | liquid flow rate, | |
| = | residence time on the tray, s | |
| = | liquid flow pass length, m | |
| = | number of perfectly mixed pools | |
| = | outlet weir length, m | |
| = | exit weir height, m | |
| = | clear liquid height, m | |
| = | superficial f-factor | |
| = | superficial velocity, m/s | |
| = | superficial velocity under flooding conditions, m/s | |
| = | fractional approach to flooding | |
| = | liquid composition of a light key component in a pseudo-binary mixture | |
| = | vapor composition of a light key component in a pseudo-binary mixture |
Greek letters
| = | density, | |
| = | viscosity, Pa.s |
Subscripts
| = | liquid phase | |
| = | vapor phase | |
| = | light key component | |
| = | heavy key component |