低温精馏法提纯三氟化硼的工艺研究

Purification process of boron trifluoride by cryogenic distillation

针对三氟化硼气体由2.5 N(摩尔分数99.5%)提纯至4 N(摩尔分数99.99%)的技术工艺进行研究,采用双塔连续低温精馏的技术路线;通过Aspen Plus模拟计算,利用灵敏度分析得到最佳的工艺参数,包括操作压力、操作温度、理论板数和回流比等工艺参数,为三氟化硼精制工艺的实验研究奠定了理论基础。

The purification process of boron tri-fluoride from 99.5% （ mole fraction） to 99. 99% by cryogenic distillation technology is highlighted in this study. Operational process parameters （i. e. pressure and temperature ） and equipment parameters are presented. The optimum number of theoretical plates and reflux ratios of the twin towers are also obtained by simulation study on the cryogenic rectification process with Aspen plus.