A modified Oldershaw column for distillation efficiency measurements

Kalbassi, Mohammad Ali; Biddulph, Michael W.

doi:10.1021/ie00066a012

Cited by 11 publications

(9 citation statements)

References 6 publications

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“…A wide range of composition was investigated, and Figure 5 illustrates the variation of the point efficiency of methanol in the quaternary mixtures. These efficiencies are composition-dependent and exhibit similar trends to those shown in the binary systems methanol-water and methanol-n-propanol (Kalbassi, 1987; Kalbassi and Biddulph, 1987), that is, a decrease in point Medina et al (1979) showed that experimental errors can be very significant under these conditions, since the numerator and the denominator of Eq. 1 are of the order of the experimental error.…”

Section: Modijed Oldershaw Columnsupporting

confidence: 63%

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Multicomponent efficiencies in two types of distillation column

1988

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A study of the efficiencies of two plate distillation columns is reported. One column had three rectangular trays with a flow path length of about 1 m, the other was a modified glass Oldershaw column with one tray of 38 mm dia. Tray efficiencies were measured in both columns and point efficiencies were deduced for the rectangular column.The systems studied were ternary and quaternary mixtures of alcohols and water. The results showed that for thermodynamically nonideal systems significant differences existed among the individual component point efficiencies. In the case of an ideal system the component point efficiencies were effectively equal, but tray efficiencies were different due to differing volatilities and composition profiles across the large trays.This study illustrates the need to allow for the above effects in largecolumn designs for multicomponent systems. The possibility of using laboratory-scale point efficiencies in these designs is explored.

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Section: Modijed Oldershaw Columnsupporting

confidence: 63%

“…The column, shown in Figure 2, has external downcomers. Further particulars of this column are given in Table 1, and development details are given elsewhere (Kalbassi, 1987;Kalbassi and Biddulph, 1987).…”

Section: Modified Oldershaw Columnmentioning

confidence: 99%

Multicomponent efficiencies in two types of distillation column

1988

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“…In this context, Krishna (1980) questioned the work by Medina et al (1979) regarding the effect of surface tension on mass transfer, as the multicomponent theory does not take this into account. The surface tension of the ternary MeOH/l-PrOH/H20 system measured at boiling point was obtained by Kalbassi (1987) by using a glass tensiometer. Surface tension gradients are only significant at very low alcohol concentrations and will not have any significant effect at higher alcohol concentrations where the experiments are carried out.…”

Section: Interpretation Of Resultsmentioning

confidence: 99%

“…The point efficiencies for the binary systems of interest were measured by Dribika (1986) and for the system 1-PrOH/H20 measured as reported by Kalbassi (1987).…”

Section: Interpretation Of Resultsmentioning

confidence: 99%

Distillation efficiencies for methanol/1-propanol/water

Biddulph¹,

Kalbassi²

1988

Ind. Eng. Chem. Res.

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“…Addition of ethanol in water can effectively reduce the liquid surface tension, particularly quickly at low concentration (Fig. 1), therefore, desorption of ethanol from water can induce the Marangoni effect 28, 29. The experimental procedures were as follows: first, the liquid phase mass transfer for oxygen desorption from distilled water was measured.…”

Section: Experimental Setups and Determination Of Parametersmentioning

confidence: 99%