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Control of a three-column distillation process for separating acetonitrile, chloroform and ethanol
Separation and Purification Technology ( IF 8.1 ) Pub Date : 2024-12-20 , DOI: 10.1016/j.seppur.2024.131081 William L. Luyben
Separation and Purification Technology ( IF 8.1 ) Pub Date : 2024-12-20 , DOI: 10.1016/j.seppur.2024.131081 William L. Luyben
Distillation is arguably the most studied unit operation in the chemical engineering literature. Thousands of papers and dozens of books over the last century have been devoted to the design and control of distillation systems. The reason for the extensive interest is the high energy consumption of the thousands of distillation columns operating around the globe for separating a host of different mixtures of vitally important chemicals. When the vapor–liquid equilibrium of the components is non-ideal, azeotropes can occur that require complex distillation configurations to achieve the desired separation. A recent paper presented extensive evaluations of the steadystate designs of five alternative ternary azeotropic separation configurations with several alternative energy-saving schemes for the important chloroform, acetonitrile and ethanol separation. Dynamic controllability was not studied.This paper develops a dynamic control structure for the optimum process flowsheet that features a three-column process operating at three different pressures. All of the acetonitrile is removed out the bottom in the first column. Then the binary chloroform-ethanol mixture is separated using a conventional two-column pressure-swing distillation configuration with heat integration by using the high-temperature overhead vapor from the high-pressure column to reboil the low-pressure column.
更新日期：2024-12-20
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