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。
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。
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.
那末务求不宽大，能够取舍有油泵，加上一些防油净化措施，如加冷阱、障板、挡油阱等，也能达成肮脏真空务求。
The primary technology processes are many scales of countercurrent extraction, vacuum concentration, a drop purification and vacuum drying in low temperature.
工艺主要流程为茶汤预处理后的多级逆流萃取、真空浓缩、纯化沉析、低温真空干燥。
The experimental study for purification of peach aldehyde by vacuum batch distillation, as well as the heat sensitivity of the product, is carried out.
采用真空间歇精馏技术对桃醛原料进行分离试验，考察了桃醛的热敏性，确定了安全的操作温度范围和适宜的操作方法。
Cooperating with composite filter aid, vacuum filter help to improve the quality and efficiency of purification of machine oil.
在复配助滤剂的协同作用下，减压抽滤有助于提高液压油的净化效率、净化质量。
Lactide monomer was obtained by vacuum distillation of lactic acid. After purification by recrystallization, the lactide was polymerized to polylactic acid with zinc oxide as the catalyst.
乳酸经减压蒸馏制得单体丙交酯，再以氧化锌为催化剂聚合得到聚乳酸。
Lactide monomer was obtained by vacuum distillation of lactic acid. After purification by recrystallization, the lactide was polymerized to polylactic acid with zinc oxide as the catalyst.
乳酸经减压蒸馏制得单体丙交酯，再以氧化锌为催化剂聚合得到聚乳酸。
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