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Visual Encyclopedia of Chemical Engineering
Distillation columns that have design modifications for the purpose of more efficient-energy utilization are often complex systems which present difficult process control problems. The work discusses the theory and development of several algorithms that offer improved controller responses and operational flexibility. One of the major contributions of this work is the development of methods where the number of manipulated variables exceeds the number of controlled variables. The system is a binary distillation column equipped with an intermediate heat exchanger that partially condenses vapors in the rectifying section of the column. This intermediate condenser allows a portion of the energy expended in the reboiler to be recovered at a useful temperature. The inter-condenser heat duty was examined for use as an extra process control input, used for regulating the distillate and bottoms product compositions, which were the controlled variables.
No document with DOI "10.1.1.633.6812"
A short-cut method for batch distillation columns working at constant reflux was applied to solve a problem of four components that needed to be separated and purified to a mole fraction of 0. Distillation columns with 10, 20, 30, 40, and 50 theoretical stages were used; reflux ratio was varied between 2 and The best combinations of theoretical stages and reflux ratio were obtained for each method.
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