Separation of ternary liquid systems by molecular and ionic interaction modification with modeling
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ID: 284877
2008
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Abstract
The semiconductor and optical industries generate large amounts of spent solvents per year. These spent solvents are composed of about 90% organic solvents such as isopropyl alcohol (IPA), toluene, acetone, methyl ethyl ketone (MEK) and ethanol. The spent solvents are wastes in the cleaning process. They are mixtures of solvents that are used in removing dirt, grease, and waxes and usually mixed with minimal quantity of water. At present they are handled like special wastewater and treated accordingly. However, this treatment method is feasible only when small amount of spent solvents are to be disposed of. Since 12000 metric tons are generated annually by the Philippine industries and the volume is steadily increasing, this traditional method is no longer viable due to its adverse effects on the environment, health and safety. Solvent recovery by conventional distillation is the best option to recover and re-use the constituent solvents of the spent solvent system. But the conventional distillation of this nonideal system to produce high purity solvents is limited by the formation of the azeotrope. Hence, in this study the idea of adding an ionic salt to the spent solvent system so as to enhance the separation by traditional distillation was tested. Specifically, the effect of the type and concentration of the salt on the boiling point and VLE were investigated. The test spent solvent system is a ternary mixture composed of toluene, IPA and water with the concentration of water fixed at 10% by volume. Different amounts of salts (NaCl, CaCl2, MgCl2, CuCl2, Na2SO4) were separately added to each of the prepared ternary mixture to fix the desired molality of the salt. Experiments performed were the boiling point determination, generation of the VLE data using the ebulliometer and batch simple salt distillation. Based on the results, all the salts were found to be capable of lowering the boiling point of the ternary system studied and the lowering is more pronounced at the higher concentration of the salt. Sodium sulfate was the most effective in lowering the boiling point of the system. Although the lowering in the boiling point of the solutions with salt was not statistically significant, a decrease of about 1-4oC is an interesting result. Distillation at lower temperatures means substantial amounts of energy will be saved making the process economical. Another valuable result is the increase in the concentration of the nonpolar substance (toluene) in the vapor phase when
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| Authors | Dugos, Nathaniel P. |
| Journal | Malay Journal |
| Year | 2008 |
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| Keywords | Keywords not found |
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