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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。
Under the condition of low system pressure, the volatilization kinetics of antimony sulfide was studied by using self-made vacuum weight loss equipment and constant temperature loss-of-mass method using pure antimony sulfide as raw material. Theoretical analysis shows that antimony sulfide is more volatile, the process is in line with the liquid volatile model, and the control step of vacuum evaporation is liquid surface evaporation. The experimental results show that the volatilization rate gradually increases with the increase of distillation temperature The rate of volatilization decreases gradually with the increase of system pressure. When the system pressure is constant, the volatilization rate constant is constant at constant temperature, and the volatilization law follows the zero-order kinetic characteristics. By analyzing Weight loss data, the volatilization rate equation of antimony sulphide under the system pressure of 20 Pa was fitted. The apparent activation energy of evaporation was calculated to be 57.6 kJ / mol, and the evaporation coefficient in the experimental temperature range was obtained. , And as the distillation temperature increases, the value is smaller.