This approach is sometimes called the Ponchon-Savarit Method. Working on the Hx diagram is more general than a McCabe-Thiele construction, because it. Ponchon – Savarit Method Presentation by. Prof. K. V. Rao Programme Director Department of Petroleum Engineering & Petrochemical Engineering. Lever Arm. Modified versions of the Ponchon-Savarit and McCabe-Thiele methods are presented which incorporate a correct analysis of the feed region in the case of partly.
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I see where the problem is coming from.
Ponchon Savarit Method | Physics Forums
MaylisApr 19, The Ponchon Savarit method does not make this simplifying assumption, so it is more accurate. Consequently, savwrit are 5 ideal stages required for this separation — asvarit a partial reboiler, that means 4 ideal trays. Do you already have an account? Join Physics Forums Today! M-T would provide me with a basic approximation on the number of stages, assuming enthalpy concentration data is not available. Hello, I’ve worked for quite some time with Ponchon-Savarit at least, for binary distillation.
A calculation often begins by using the overhead product composition and temperature to obtain h D and ,ethod y1. Thus, it is useful to redefine our distillation system to be adiabatic, by bringing the condenser and reboiler inside the system boundary.
Follow the tie line that passes through the V 1 point back to the saturated liquid curve. This graphical method uses both material and energy balances to determine the methos of theoretical stages required to achieve a specific separation.
Construction continues until L 5 which is almost directly on top of x B.
Rearranging metbod enthalpy balance gives: Apr 19, 2. The “pinch point” also expands, resulting in a single line where the operating and tie lines overlap. This approach is sometimes called the Ponchon-Savarit Method. These in turn are used with the reflux ratio to get h Dp.
The intersection is the point L 1 liquid on tray 1. Apr 21, 7.
Ponchon-Savarit Graphical Equilibrium Stage Method – Wolfram Demonstrations Project
MaylisApr 22, Minimum reflux still corresponds to a pinch at the feed conditions, so to determine the minimum reflux a line must be constructed so that the overall enthalpy line coincides with the tie line that runs through the feed point. No, create an account now.
Your name or email address: The very shape of the Hx diagram provides a clue as to the importance of the energy balances. I personally understand it this way: Distillation calculations can be performed graphically on an enthalpy-concentration Hx diagram.
The column has a partial condenser metnod reboiler. Apr 19, 1. Equilibrium data is collected. Construct an operating line through both the L 1 point and the D’ point.
Ponchon Savarit Method
Apr 21, 5. These were then paired with the equilibrium curve, which relates the composition of liquid on a stage to the vapor leaving the methor. For an adiabatic process, the feed and products will be colinear on an Hx diagram.
The overhead product is 95 percent hexane and the bottoms 10 percent hexane. The coordinates are their composition and enthalpy. If tie lines are not available, they may be constructed using the xy diagram. The tie lines are shown in purple.
Plot the feed and product points. This line represents the system enthalpy balance, and so is called the overall enthalpy line.
Ponchon-Savarit Graphical Equilibrium Stage Method
Download free CDF Player. Apr 19, 3.
Al-Baghli, and Brian G. Apr 21, 6.
The value of is determined by the program and the ratio of reflux to distillate flow rates at the top stage is chosen such that. Everyone who loves science is here! The overall enthalpy line is then drawn from D’, through F. These values and the reflux ratio can be used savarut find the enthalpy coordinate for savarig D’ point, H Dp.
Apr 22, 8. After this modification, the system is adiabatic, so a line can be drawn through the feed point, F, and the points x Dh Dp and x Bh Bp. In savaeit diagram the light-blue lines are the stages. The bold black dots show the location of the feed and the stripping and rectifying difference points. Its intersection with the saturated vapor curve will be the point V 2.