What is the main assumption in Ponchan Savaritmethod?
This approach is sometimes called the Ponchon-Savarit Method. Working on the Hx diagram is more general than a McCabe-Thiele construction, because it takes direct account of the thermal effects and does not require an assumption of equimolal overflow.
How does the ponchon Savarit method differ with McCabe Thiele method?
For multistage tray towers Ponchon Savarit method was first developed for the case of negligible heat losses. The use of the method is illustrated in the case studies. The method is rigorous and time consuming. The McCabe Thiele method is less rigorous as it doesn’t enthalpy data.
What is the auxiliary line used for in the enthalpy composition plot?
Explanation: The auxiliary line connects the boiling line and dew line by acting as a vertex of a right angle triangle with the hypotenuse as the isothermal line.
What are the limitations of McCabe Thiele method?
One of the main disadvantages of the McCabe-Thiele Method is that it is not very useful for analyzing the distillation of mixtures containing more than 2 components. However, the method is still useful as a teaching tool and a conceptual tool.
What is ponchon Savarit method used for?
The Ponchon-Savarit diagram (Ponchon 1921; Savarit 1922) for binary distillation allows one to account for enthalpy effects that cause a varying molar overflow when stepping off stages graphically. It is a diagram that plots vapour and liquid enthalpy curves versus composition.
What is the main disadvantage of the McCabe Thiele method?
What is enthalpy-concentration diagram?
Generally an enthalpy-concentration diagram for a system is prepared for fixed. pressure, and to be complete it should include data on the solid, liquid, and vapor. phases. Such charts are useful for calculations involving heat balances with ac- companying concentration changes.
What is pressure enthalpy diagram?
The pressure-enthalpy diagram (log P/h diagram) is a very useful tool for refrigerant technicians. The area below the saturation lines for liquid and gas (A-CP-B in Figure 2.1) represents the conditions where the refrigerant can change its state of aggregation from liquid to gas or vice versa.
What are the main assumption for the McCabe-Thiele method?
It uses the fact that the composition at each theoretical tray (or equilibrium stage) is completely determined by the mole fraction of one of the two components and is based on the assumption of constant molar overflow which requires that: the molar heats of vaporization of the feed components are equal.
What is Q in Mccabe Thiele method?
The parameter q is the mole fraction of liquid in the feed and the slope of the q-line is q / (q – 1). For example, if the feed is a saturated liquid it has no vapor, thus q = 1 and the slope of the q-line is infinite which means the line is vertical.