Provides the theoretical data for the vacuum degassing purification and vacuum dry of liquid medium.
为液体介质的真空脱气净化和真空干燥提供了理论数据。
2
Purifying selenium by vacuum distillation. Metal selenium purification is on the base of different elemental volatility.
真空蒸馏提纯硒利用元素的挥发性不同进行金属硒的提纯。
3
Then the view is not large, to choose a pump, plus some oil purification measures, such as the Canadian cold trap, baffle, retaining the oil wells, but also in order to reach a dirty vacuum.