The purification methods of phosphine include adsorption method, lowtemperaturedistillation method and membrane separation method etc.
总结了磷化氢的精制方法，主要有吸附法、低温精馏法和膜分离法等。
2
For the environmental protection and the resource recycling, a new process of rolling mill sludge disposal by the lowtemperaturedistillation was proposed.
Main factors such as final heating temperature, heating time, heating speed and particle size of raw material on dry distillation of oil shale at lowtemperature were examined.