蒸馏塔外文文献和翻译 Abstract The open loop dynamic behaviors of internal thermally coupled distillation column with four different purities(1ow 。
moderate．，high．and very high-purity)are studied．These dynamic behaviors are characterized by strong asymmetric non-linearity。high
sensitivity to operation conditions change and distinct inverse response+With the increase of purity，these dynamic behaviors are intensified
and become more complex，which easily lead to the mismatch between linear model and plant and also change the relationship between ma-
nipulated and controlled variables．
Keywords： thermal coupling，inverse response，non-Iinearity。high purity，asymmetric behavior-
Distillation is the most widely used separation
operation in the chemical process industries and it
consumes a large amount of energy．According to
some recent estimates．about 40％ of energy involved
in refining and other continuous chemical process in
USA is consumed in distillation and this represents
nearly 4％ of the total energy consumption in USA in
1988⋯
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To improve the energy efficiency of distilla—
tion， various distillation methods have been pro—
posed【 ， such as heat pump columns， multi—effect
columns， Petlyuk columns and secondary reflux and
vaporization(SRV)．Except for SRV method，the
former three distillation methods have already been
industrialized in practical chemical processL 4j
，
Internal thermally coupled distillation column
(ITCDIC)employs SRV method and introduces in
ternal heat integration between the rectifying and the
stripping sections into the distillation system ．This
novel distillation column has received increasing at—
tention in recent years due to its great energy efficien—
cy and its low expenditure of external operation facili—
ties(Fig．1)[ ， ， ～ ．ITCDIC，without conventional
condenser and conventional re boiler，generally offers
higher energy efficiency than conventional distillatio3349
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