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Computers &em. Engng, Vol. 17, No. 516, pp. 549-560, 1993 0098-l 354193 $ +
Printed in Great Britain. All rights reserved Copyright 0 1993 Pergamon Press Ltd
DISTILLATION COLUMN TARGETS
V. R. DHOLE~ and B. LINNHOFF
Centre For Process Integration, Department of Chemical Engineering, UMIST,
Manchester M60 1QD. .
(Final revision received 10 August 1992; received for publication 30 September 1992)
Abstract-This paper relates to the design of distillation columns. In particular, it relates to the optimis-
ation of a base case design. Column optimization involves options such as different reflex ratios, pressures,
side condensing/reboiling and feed preheating/cooling. We need to establish heat loads and temperature
levels for such modifications and identify the best combined options. The paper presents a methodology
based on a combination of thermodynamics and practical aspects of column modification. The method-
ology gives the engineer targets for design options ahead of design. In addition, it provides targets for
the best combination of options.
Alongside heat load and temperature targets, the methodology clarifies the effect of design modifications
on column capital cost, also ahead of design. The methodology is applicable to nonideal multicomponent
systems and complex distillation configurations. There are downstream appli