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Study on Salt Selection and Saline Extraction in Separation Process

Author: RenHongDong
Tutor: CuiXianBao;YangZhiCai
School: Tianjin University
Course: Chemical Engineering
Keywords: Salt effect Salt effective separation The selection of a salt Add salt liquid liquid equilibrium 2 - methylpyrazine
CLC: TQ028
Type: Master's thesis
Year: 2003
Downloads: 359
Quote: 5
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Abstract


This paper through the combination of theoretical analysis and experimental methods, mainly to study the choice of salt effective separation of salt, salt and liquid liquid equilibrium of 2 - methylpyrazine - water mixture salt extraction process. The choice of salt is salt effect the separation of the core issues. In this paper, the free energies of transfer and phase equilibria in the size of the salt effect combine the salt effect theory to explain the equilibrium free energies of transfer. Adopt the selective solvation model, the use of scaled particle theory of salt in an aqueous system standard molar free energies of transfer. Salt in six aqueous systems standard molar free energies of transfer calculated with the salt effect, the researchers found that the salt effect with the salt standard molar free energies of transfer in aqueous systems increases, so salt effect The standard molar free energies of transfer models to choose effective salt as separating agent can be used in the separation process. Salt and liquid-liquid equilibrium studies is the salt extraction process, is the key to the process. In this paper, the the turbidity method to study the solubility of salt ternary system, the relationship between the electrolyte solubility in the mixed solvent and mixed solvent associated with salt extraction solubility curve has important value. The choice of salt with salt extraction experimental study investigated differences in the ability of different types of salt phase. Salt and liquid-liquid phase separation is divided into three categories, lower concentrations of organic solvents Ⅰ type: V beginning gt; V final; high concentration of organic solvent type Ⅱ: V starting lt; V final; Ⅲ: both Ⅰ and type Ⅱ characteristics of both type I to type Ⅱ transition. Change of the pH value of the mixed solvent system be salt sub-phase liquid-liquid equilibrium of the ternary system have an important impact, the study found that the pH gt; 7 have beneficial liquid-liquid phase separation occurs, while the pH lt; 7 is not conducive to the occurrence of liquid-liquid phase separation. In addition, with salt liquid - liquid equilibrium data associated. The seven aqueous systems with salt liquid equilibrium data were measured using a mixed solvent electrolyte system Chen NRTL model (the ENRTL model.) The experimental data regression the seven the salt system ENRTL model parameters by the regression ENRTL model parameters associated with salt liquid equilibrium data. Associated with the calculation results with the experimental results. With salt liquid-liquid equilibrium studies based on a 2 - methylpyrazine (MP) - water mixture with salt extraction process. MP-water mixture with salt optimum conditions of the extraction process: selection of NaOH aqueous solution as extractant, w (NaOH) = 60% of extraction temperature 30 to 40 ° C extract ratio m (NaOH aqueous solution) / m (MP-water mixture ) = 0.5 / 1. NaOH on MP water azeotrope dehydration rate was 95.5%, after extraction the organic phase w (MP) = 96.1124%, and to study the stability of the aqueous NaOH solution as an extractant, NaOH aqueous solution of performance and stability, easily recovered and can be recycled.

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CLC: > Industrial Technology > Chemical Industry > General issues > Chemical processes ( physical processes and physical and chemical processes ) > Separation process
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