batch distillation - design and operation

[...]... Mujtaba 7 I Feed I 7 i l $ $ Main-Cut Off-Cut Main-Cut + Figure 1.3 Semi -batch (Semi-continuous) Distillation Column 1.5 Semi -batch (semi-continuous )Distillation Figure 1.3 shows a typical semi -batch (semi-continuous) distillation column The operation of such columns is very similar to CBD columns except that a feed is introduced to the column in a continuous or semi-continuous mode This type of column... extractive distillation, reactive distillation, etc (Lang and coworkers, 1994, 1995; Mujtaba, 1999) Further details of semi -batch distillation in extractive mode of operation are provided in Chapter 10 1.6 Advantages of Batch Distillation The main advantages of batch distillation over a continuous distillation lie in the use of a single column as opposed to multiple columns and its flexible operation 8 Batch. .. 189 191 7 DESIGN AND OPERATION OPTlMlSATlON 7.1 Introduction 192 192 7.2 Design and Operation Optimisation for Single Separation Duty by Repetitive Simulation 193 7.2.1 Example Single Separation Duty 199 7.3 Design and Operation Optimisation for Single and Multiple Separation Duties: Problem Formulation and Solution 199 7.3.1 Representation of Design Operations and Separations... modelling, design, operation, control and synthesis of continuous distillation processes 1.4 Batch Distillation Batch distillation is, perhaps the oldest operation used for separation of liquid mixtures For centuries and also today, batch distillation is widely used for the production of fine chemicals and specialised products such as alcoholic beverages, essential oils, perfume, pharmaceutical and petroleum... This type of operation is supposed to eliminate the thermal decomposition problems of the high boiling products Abrams et al (1987), Mujtaba and Macchietto (1994) and Sorensen and Skogestad (1996) used such columns for batch distillation and compared their performances with conventional columns 11 Batch Distillation 12 Feed Tank I I Main-Cut 1 Off-Cut Main-Cut Figure 2.1 Inverted Batch Distillation. .. (1997) and Furlong et al (1999) used MultiBD columns for simulation, control and optirnisation studies :1 -LA$ Feed tank Product Tanks ,- ( I 1 Product Tanks Figure 2.2 Middle Vessel Batch Distillation Column (MVC) Batch Distillation 14 Figure 2.3 Multivessel Batch Distillation Column (MultiBD) 2.2.4 Continuous Column for Batch Distillation Attarwala and Abrams (1974) considered the batch. .. Conventional Batch Distillation 58 4.2.1 Rayleigh Model Model Type I 58 4.2.2 Short-cut Model- Model Type II 59 4.2.3 Simple Model- Model Type I11 63 4.2.4 Rigorous Model - Model Type IV 68 4.2.5 Rigorous Model wt Chemical Reactions - Model Type V 79 ih 4.3 Models for Unconventional Batch Distillation 85 4.3.1 Continuous Column for Batch Distillation 85 4.3.2 Inverted Batch. .. advantageous These are described below 2.2.1 Inverted Batch Distillation Column This type of batch distillation column (Figure 2.1) originally proposed by Robinson and Gilliland (1950) combines the feed charge and the condenser reflux drum and operates in an all-stripping mode with a small holdup reboiler This type of column operates exactly as the conventional batch column except that products are withdrawn... condenser or a partial condenser system I U Bottom Figure 1.1 Continuous Distillation Column Batch Distillation 6 11, I; I &A Main-Cut Off-Cut Main-Cut 11 Figure 1.2 Conventional Batch Distillation (CBD) A series of product accumulator tanks connected to the product streams to collect the main and or the intermediate distillate fractions Operation of such a column involves carrying out the fractionation... A., Champuis, A., Guido, D and Loreau, J., Role of batch processing in the chemical process industry In Proceedings o NATO ASI on f Batch Processing Systems Engineering, Antalya, Turkey, May 29-June 7, 1992 McCabe, W.L., Smith, J.C and Harriot, P., Unit Operations of Chemical Engineering (6" edition, McGraw-Hill, 2001) Mujtaba, I.M., Optimal Operational Policies in Batch Distillation PhD Thesis, (Imperial . Short-cut to rigorous methods for optimal design and operation 0 Binary to multi-component off-cut recovery and optimal recycling strategies. vii Batch Distillation Vlll 0 Modelling and. of batch reactive and extractive distillation processes 0 Inverted, middle vessel and multivessel batch distillation column operations Use of continuous distillation columns for batch distillation. 1.1. Batch Processes 3 1.2. Distillation 4 1.3. Continuous Distillation 4 1.4. Batch Distillation 5 1.5. Semi -batch (semi-continuous) Distillation 7 1.6. Advantages of Batch