[논문]Distillation at minimum variable reflux

doi:10.1016/0009-2509(56)80013-4

Distillation at minimum variable reflux

Chemical engineering science, v.6 no.2, 1956년, pp.79 - 88

van Wijk, W.R. (Laboratory of Physics and Meteorology, Agricultural University, Wageningen The Netherlands) , Bruijn, P.J. (Laboratory of Physics and Meteorology, Agricultural University, Wageningen The Netherlands)

Abstract ▼ AI-Helper

AbstractMinimum heat input in a distillation in which the reflux is variable is calculated by a modification of UNDERWOOD'S minimum-reflux calculation. The method is based upon the analytical theory of distillation previously given by one of the authors. Instead of the molal liquid and vapour rates actually occurring in the column, generalized rates are defined which are dependent on the molal heat rates of the vapour phase and of the liquid phase. The equations between the generalized rates are formally identical with the equations between the molal rates in a distillation at constant reflux. To obtain these generalized rates the molal vapour heat content must be approximated by a linear function of the equilibrium constant of a reference component K and the molal liquid heat content must be approximated by a linear function of 1K. These approximations need, however, only be valid in the relatively narrow temperature range between the two “pinches.” Constant relative volatilities have also to be assumed for that region only.

Abstract

RésuméLes auteurs présentent une méthode pour calculer la quantité minimum de chaleur nécessaire pour effectuer une distillation á reflux variable. La méthode est fondée tantôt sur la méthode d'UNDERWOOD pour calculer le reflux minimum en cas d'un reflux constant, tantôt sur la théorie analytique de la distillation développée antérieurement par un des auteurs. Au lieu des courants de vapeur et de liquide actuels on introduit des courtants généralisés qui dépendent des enthalpies de la vapeur et du liquide dans la colonne. Ces quantités généralisées sont liées les unes aux atures par des équations identiques formellement aux équations gouvernant la distillation à reflux constant. Pour obtenir ces quantités généralisées il faut admettres que l'enthalpie de la vapeur puisse être représentée par une fonction linéaire de la constante d'équilibre K d'un des composants du mélange, pris comme substance de référence ; il faut également que l'enthalpie du liquide puisse être représentée par une fonction linéaire de 1K. Il suffit que ces approximations soient valables entre les deux régions de composition invariable (pinches). Il faut aussi que les volatilités des composants aient un rapport constant dans cette intervalle de température seulement.

참고문헌 (11)

Chem. Eng. Sci. Acrivos 4 29 1955 10.1016/0009-2509(55)85004-X

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Chem. Eng. Sci. Acrivos 4 68 1955 10.1016/0009-2509(55)85010-5

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Amer. Inst. Chem. Engrs. Jenny 35 635 1939
J. Inst. Petroleum Underwood 31 111 1945
J. Inst. Petroleum Underwood 32 598 1946
J. Inst. Petroleum Underwood 32 614 1946
Chem. Eng. Progress Underwood 44 603 1948
Physica Van Wijk 15 634 1949 10.1016/0031-8914(49)90120-2

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Physica Van Wijk 15 933 1949 10.1016/0031-8914(49)90058-0

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Physica Van Wijk 17 485 1951 10.1016/0031-8914(51)90014-6

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Proc. Third World Petroleum Congress Van Wijk 87 1951

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Distillation at minimum variable reflux

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