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JSIR Vol.66 [2007] >
JSIR Vol.66(01) [January 2007] >
| Title: | Influences of feed and condenser temperature on molecular distillation of ideal binary mixtures |
| Authors: | Shao, P
Jiang, S T
Ye, Y K |
| Keywords: | Binary mixture
Condenser temperature
Feed temperature
Molecular distillation |
| Issue Date: | Jan-2007 |
| Publisher: | CSIR |
| Abstract: | Balanced equations of a binary mixture for molecular distillation (MD) were derived on the basis of relation of heat and
mass transfer in liquid films on both the evaporating and condensing surface. Effects of feed temperature and condenser
temperature on film thickness, film surface temperature and concentration, degree of evaporation and concentration of
distillate were analyzed for MD. The length of evaporating cylinder along with surface temperature of evaporating film
reached steady state decreasing with increasing of feed temperature. Evaporation rate decreased with increasing of
condenser temperature because of re-evaporation. Influences of splashing on distillate and re-evaporation were minimized
and gradient concentration of distillate and increased degree of evaporation were obtained by the divided evaporator and
condenser. Evaporating film temperature was increased with the gradient increase of divided evaporator temperature. Mode
of divided molecular still could be used for the separation of mixtures with largely different saturated pressure at one stage
operation. Model values agreed well with the experimental values of Cvengros. Maximum relative differences did not
exceed 5.1%. |
| Page(s): | 37-46 |
| ISSN: | 0022-4456 |
| Source: | JSIR Vol.66(01) [January 2007]
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