Flash Distillation Energy Balance
This calculator determines the required feed preheat temperature for a flash distillation unit, based on specified feed composition, target vapor fraction, and thermodynamic properties. It uses an energy balance to relate the enthalpy of the feed to the enthalpies of the resulting vapor and liquid phases at the flash temperature.
📖 Need the theory? Read the methodology, assumptions, and equations in the full reference guide.
1. Define Input Parameters
2. Engineering Output
Saturated liquid enthalpy of A (h_A_l_sat)
- J/mol
- J/mol
Saturated liquid enthalpy of B (h_B_l_sat)
- J/mol
- J/mol
Saturated vapor enthalpy of A (h_A_v_sat)
- J/mol
- J/mol
Saturated vapor enthalpy of B (h_B_v_sat)
- J/mol
- J/mol
Mixture liquid enthalpy (h_L)
- J/mol
- J/mol
Mixture vapor enthalpy (h_V)
- J/mol
- J/mol
Required feed enthalpy (h_F)
- J/mol
- J/mol
Mixed liquid heat capacity (cp_mix)
- J/(mol·K)
- J/(mol·K)
Feed preheat temperature (T_F)
- °C
- °C
Need this calculation offline?
Download Offline Excel CalculationContext & Assumptions
Flash distillation is a fundamental unit operation used to separate liquid mixtures into vapor and liquid phases by reducing pressure. The energy balance is crucial for designing separation trains and optimizing energy efficiency, particularly in determining the necessary preheat temperature of the feed stream to achieve a desired vapor fraction.
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The results provided by this tool are for educational and preliminary estimation purposes only.
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