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Separation of isopropanol from aqueoussolution by salting-out extractionTang Zhigang,Zhou Rongqi and Duan ZhantingChemical Engineering Department, Tsinghua University, Beijing 100084, Peoples Republic of China
NOTATION
INTRODUCTION
(Received 1 August 2000; revised version received 14 March 2001; accepted 19 March 2001
Correspondence to: Tang Zhigang, Chemical Engineering Department, Tsinghua University, Beijing 100084, Peoples Republic of China
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EXPERIMENTALMaterials and reagents
Screening of extracting agent
Screening of salting-out agent
Figure 2. Isopropanol and water separation by salting-out extraction
coupled with azeotropic distillation.
Figure 1. Isopropanol and water separation by azeotropic distillation.
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Analytical methods
RESULTS AND DISCUSSIONScreening of salting-out agent
Table 1.Salting-out effects of different inorganic salts a (20C)
Figure 4.Comparison of salting-out strength with integral heat ofdissolution for salt (Dal/D0data were adapted from Table 1; dissolution heat
data collected from Ref 14) symbol represents heat-absorbing and
represents heat-releasing.
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Factors effecting LLE
Figure 6.Distribution coefficients of isopropanol and separation
coefficients of isopropanol vs water at different salt concentrations (28 C).
(a) equilibrium aqueous potassium carbonate concentration was94.50g dm3; (b) equilibrium aqueous potassium carbonate concentration
was 190.1g dm3; (c) equilibrium aqueous potassium carbonate
concentration was 278.2g dm3.
Figure 5. LLE of hexane/isopropanol/aqueous solution with differentpotassium carbonate concentrations at 28C. (Note: The extrapolated
curves are trend curves plotted using Microsoft Excel of the experimental
data at the same conditions.)
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Salting-out extraction experiments
Figure 7. LLE of hexane/isopropanol/10% potassium carbonate aqueoussolution at various temperatures. (Note: The extrapolated curves are trend
curves plotted using Microsoft Excel of the experimental data at the same
conditions.)
Figure 8.LLE of hexane/isopropanol/10% potassium carbonate aqueoussolution at various pH values. (Note: The extrapolated curves are trend
curves plotted using Microsoft Excel of the experimental data at the same
conditions.)
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CONCLUSIONS
REFERENCES
Table 2.Salting-out extraction results