Minimum reflux

Reflux - minimum reflux Optimum reflux - minimum reflux... 

McCormick [97] presents a correlation for Gilliland s chart relating reflux, minimum reflux, number of stages, and minimum stages for multicomponent distillation. Selecting a multiplier for actual reflux over minimum reflux is important for any design. Depending on the com-... 

The two most frequently used empirical methods for estimating the stage requirements for multicomponent distillations are the correlations published by Gilliland (1940) and by Erbar and Maddox (1961). These relate the number of ideal stages required for a given separation, at a given reflux ratio, to the number at total reflux (minimum possible) and the minimum reflux ratio (infinite number of stages). 

It is important to use a consistent set of minimum reflux/minimum stages/reflux-stages correlation (27). Both the Gilliland and the Erbar and Maddox methods are consistent with the popular Fenske (Sec. 3,2.1) and Underwood (Sec, 3,2.2) methods. 

Multicomponent distillation, 393 absorption factor method, 398 azeotropic, 420-426 bubblepoint (BP) method, 406-409 computer program references. 404 concentration profiles, 394 distribution of non-kevs. 395 Edmister method, 398,399 extractive, 412, 417-422 feed tray location, 397 free variables, number of 395 Lewis-Matheson method 404 MESH eauations. 405-407 molecular, 425-427 nomenclature, 405 number of theoretical trays, 397 packed towers, 433-439 petroleum, 411-415 reflux, minimum, 397 reflux, operating, 397 SC (simultaneous correction) method, 408-411... 

Fig. 2.3.2-9 Balance lines and staircase construction, a) Minimum reflux ratio, infinite plate number, b) Finite reflux ratio, resp. finite plate number, c) Total reflux, minimum plate number.

Fig. n.64. Minimum reflux for countercurrent Fig. 6.66. Total reflux, minimum stages, multiple contact.

Total Reflux, Minimum Reflux, Number of Steves. The following feed of 100... 

A 50-50 mixture of benzene and toluene is to be separated to produce 95 percent pure products. Relative volatility for the system is 2.45. Feed condition is saturated liquid at the boiling point. Find minimum reflux, minimum stages, and ideal stages at 1.5 times minimum reflux. 

Find minimum reflux, minimum stages, and ideal stages (using 1.5 times minimum reflux). 

In general the same type of information given by the constant 0/V method can be obtained by the use of the Ponchon and Savarit method. For example, the cases of total reflux, minimum reflux ratio, and optimum feed-plate location can be easily solved. 

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