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中文摘要：
在系统压力较低的条件下,以分析纯硫化锑为原料,利用自制真空失重设备,采用恒温失重法研究了硫化锑挥发动力学。理论分析表明,硫化锑较易挥发,其过程符合液态挥发模型,真空挥发的控制步骤为液面蒸发;试验结果表明,在试验条件范围内,随着蒸馏温度的升高,其挥发速率呈逐渐增大趋势,而随着系统压力的升高,其挥发速率呈逐渐减小趋势;且系统压力一定时,温度恒定则挥发速率常数为一定值,挥发规律遵循零级反应动力学特征;通过分析失重数据,拟合出硫化锑在系统压力为20 Pa条件下的挥发速率方程,计算了表观挥发活化能值为57.6 kJ/mol,获得了实验温度范围内的蒸发系数,其值均较小,且随着蒸馏温度的升高,其值更小。
英文摘要：
The distillation of pure antimony sulfide in vacuum was empirically approximated,mathematically modeled with the surface volatilization of liquid, and experimentally evaluated with the lab-built vacuum furnace and weight-loss probe. The impact of the evaporation conditions,including the temperature, time and pressure, on the surface evaporation rate was investigated with the weight-loss of liquid Sb2S3. The calculated and measured results show that the distillation temperature and pressure strongly affect the volatilization rate. To be specific, either an increase of the temperature or a decrease of the pressure resulted in an increase of the volatilization rate. At fixed temperature and pressure, the constant volatilization rate obeys the zero order reaction kinetics. The volatilization equation at 20 Pa was derived by data-fitting of the measured weight-loss,and the activation energy was calculated to be 57.6 kJ/mol. We suggest that the results be of some technological interest.
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