Batch distillation: design and operation by IQBAL M Mujtaba

By IQBAL M Mujtaba

The batch distillation technique has existed for plenty of centuries. it really is maybe the oldest know-how for isolating or purifying liquid combos and is the main often used separation approach in batch methods. within the final 25 years, with non-stop improvement of quicker desktops and complicated numerical equipment, there were many released works utilizing exact mathematical versions with rigorous actual estate calculations and complicated optimisation options to deal with a number of very important matters, equivalent to number of column configurations, layout, operation, off-cut recycling, use of batch distillation in reactive and extractive modes, and so forth.

Batch Distillation: layout and Operation offers very good, very important contributions of many researchers from all over the world, together with these of the writer and his co-workers.

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Constant Distillate Rate This mode of operation demands constant rate of distillate throughout. This means that, for constant reflux ratio operation, the vapour load to the condenser is also constant. Boston et al. (1981) and Holland and Liapis (1983) considered this type of operation. 4. Constant Reboiler Duty In this mode heat input to the reboiler is held constant throughout. In practice it is set to its maximum limit, the value of which depends on the heat exchange system to the reboiler. Domenech and Enjalbert (1974), Greaves et al.

2) The total reflux start-up period is ended when the unit reaches its steady state. Product is collected at some constant finite reflux ratio until the accumulated product composition reaches its desired purity. This type of operation is very common in practice and is known as constant reflux operation. , 1981; Domenech and Enjalbert, 1974; Holland and Liapis, 1983). A third type of operation is a trade off between the above two types of operation. , 1990; Mujtaba and Macchietto, 1992a, 1992b; Logsdon and Biegler, 1993; Mujtaba and Macchietto, 1993, 1996, 1997; Mujtaba, 1997, 1999; Sorensen and Skogestad, 1996).

Pantelides, Comput. chem. Engng. 22 (1998), S69. , Design of Equilibrium Stage Processes (McGraw-Hill, 1963). CHAPTER 2 2. 1. Conventional Column Configuration In this configuration, the available separation section (tray or packed) is utilised in rectifying mode, with product cuts (recovered) and intermediate off-cut fractions (disposed of or recycled) collected as condensed distillate. A final residue bottom fraction may also be a desired product. 4 of Chapter 1. Further details are given in later chapters.

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