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Applied process design for chemical and petrochemical plants by Ernest E. Ludwig (Eds.)

By Ernest E. Ludwig (Eds.)

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0 2. 0 P a r t i a l Condensation of Overhead Vapors Minimum Reflux Abnormal Equilibrium Figure 8-15. Operating characteristics of distillation columns. is approximately the amount of heat required to vaporize one mol of feed at the feed tray conditions, divided by the latent heat of vaporization of the feed. Ls= Lr + qF (8-26) As an alternate to locating the “q” line, any value of xi may be substituted in the “q” line equation below, and a corresponding value of yi determined, which when plotted will allow the “q” line to be drawn in.

When separating a volatile product from volatile impurities, batch distillation is usually best. 4. Do not add a packed column to a thin film evaporator system, because complications arise. Note that good vapor-liquid equilibrium data for low pressure conditions are very scarce and difficult to locate. However, for proper calculations they are essential. See References 151 and 152 dealing with this. Studies with high-pressure distillation by Brierley [239] provide insight into some FRI studies and the effects of pressure on performance as well as the impacts of errors in physical properties, relative volatility, etc.

Operating characteristics of distillation columns. is approximately the amount of heat required to vaporize one mol of feed at the feed tray conditions, divided by the latent heat of vaporization of the feed. Ls= Lr + qF (8-26) As an alternate to locating the “q” line, any value of xi may be substituted in the “q” line equation below, and a corresponding value of yi determined, which when plotted will allow the “q” line to be drawn in. This is the line for SV - I, V - I, PV - I, BP - I and CL - I of Figure 8-15.

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