Acta Phys. -Chim. Sin. ›› 1988, Vol. 4 ›› Issue (03): 329-331.doi: 10.3866/PKU.WHXB19880320

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A STUDY OF VAPOR-LIQUID EQUILIBRIUM FOR THE TERNARY SYSTEM Li2SO4-C2H5OH-H2O AT PLATEAU ATOMSPHERE

Pan Huanqian*; Xia Shuping; Qao Shiyang   

  1. Qinghai Institute of Salt Lake; Academia Sinica
  • Received:1986-11-04 Revised:1987-07-15 Published:1988-06-15
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Abstract: In this paper, a lernary system of Li_2SO_4-C_2H_5OH-H_2O, saturated with salt, was studied. The modified Rose still was utilized to measure the p-T-x-y data for the system at plateau atmosphere (580 Torr or so). According to the Jaques and Furter's pseudo-binary system model, Wilson, NRTL and modified UNIQAC equations were used to correlate with the vapor-liquid equilibrium data. In the calculation, temperature was varied from low to high with steps of 0.01 ℃, and the formulas of |y_1+y_2-1|<10~(-4) or y_1+y_2-1>0 was used for judging the end of the calculation. The method can save the time for computation. The calculated results fit with experimental data, and the maximal deviations of y and T for the modified Uniquac equation are 0.025 molar fraction and 0.23 ℃. In this system, the solubility of lithium sulfate decreases rapidly with the increase of the concentration of alcohol. It means ethanol has a very hight salt-out capacity for lithium sulfate.