Evaporation and distillation - Separation by single-stage partial evaporation - Flash distillation
9 important questions on Evaporation and distillation - Separation by single-stage partial evaporation - Flash distillation
What is flash evaporation?
Which two types of flash evaporation are there?
Which mass balances are there for flash evaporation?
The component mass balance for the most volatile compound and the overall mass balance.
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Considering flash evaportation what correlations can be used to express y?
and 
How does isothermal flash work?
A specific temperature is set. Then one option is to set the liquid-vapor ratio.
The other option is to set the total pressure.
How is the fraction feed remaining liquid (q) defined?
used instead of the vapor-liquid ratio
How can the equilibrium benzene mole fraction be determined from this picture?
The operating lines are defined as:
The intersection points give the vapor and liquid composition.
What three boundary conditions can be defined when specifying T and Ptot for an isothermic flash evaporation?
2. 0<q<1
3.
Combining 
with the boundary condition 
, what does the equation for a multicomponent mixture become?
solving for q and calculating xi and yi.
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