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Simultaneous heat and mass transfer in binary distillation—II: Experimental

✍ Scribed by Ferhan Kayihan; Orville C. Sandall; Duncan A. Mellichamp

Publisher
Elsevier Science
Year
1977
Tongue
English
Weight
658 KB
Volume
32
Category
Article
ISSN
0009-2509

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✦ Synopsis

A theoretlcal study of sunultaneous heat and mass transfer m bmary dlstdlation has shown that heat and mass transfer coefficients can be appropnately evaluated If hqud phase temperatures and compositions are measured as funcuons of herght m a column In tlus study, the expenments were camed out m a wetted-wall column usmg a methanol-water bmary system at one atmosphere Specml probes were deslgned to deternune the state of the hquld phase Temperatures were measured with mlcrothermocouples and liquid samples were analyzed with a high preckslon refractometer The lrquld phase was found to be saturated which mdlcated, m accordance with the conclusions from a theoretical study, that all the resistance to mass transfer was m the vapor phase Local transfer coefficients were calculated usmg the composition data as a function of column height The results were correlated by an equation showmg close agreement wrth the Chllton-Colbum equatron % = 0 ()39ScY-2f~ReY-0 2o cm-' It LS concluded that mass transfer m the vapor phase LS the controlhng remstance m dtshllatlon and that there IS no additional evaporation wlthm the hquld phase caused by heat transferred from the vapor phase as proposed by some previous investigators

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