“molecular distillation”的概念、定义、翻译、参考文献-科学参考

molecular distillation

Physics

Distillation in high vacuum (about 0.1 pascal) with the condensing surface so close to the surface of the evaporating liquid that the molecules of the liquid travel to the condensing surface without collisions. This technique enables very much lower temperatures to be used than are used with distillation at atmospheric pressure and therefore heat-sensitive substances can be distilled. Oxidation of the distillate is also eliminated as there is no oxygen present.

Chemistry

Distillation in high vacuum (about 0.1 pascal) with the condensing surface so close to the surface of the evaporating liquid that the molecules of the liquid travel to the condensing surface without collisions. This technique enables very much lower temperatures to be used than are used with distillation at atmospheric pressure and therefore heat-sensitive substances can be distilled. Oxidation of the distillate is also eliminated as there is no oxygen present.

Chemical Engineering

A vacuum distillation used to separate and purify substances that would otherwise be adversely affected by distillation at a higher temperature. Using pressures of below 0.01 torr, the gaseous phase no longer exerts a significant pressure on (p. 242) the substance being evaporated. The rate of evaporation is therefore not dependent on the pressure since mass transport is governed by molecular dynamics and not fluid dynamics. Molecular distillation is used for the purification of oils, the manufacture of lubricants from petroleum, and the purification of vitamins.

单词	molecular distillation
释义	molecular distillation Physics Distillation in high vacuum (about 0.1 pascal) with the condensing surface so close to the surface of the evaporating liquid that the molecules of the liquid travel to the condensing surface without collisions. This technique enables very much lower temperatures to be used than are used with distillation at atmospheric pressure and therefore heat-sensitive substances can be distilled. Oxidation of the distillate is also eliminated as there is no oxygen present. Chemistry Distillation in high vacuum (about 0.1 pascal) with the condensing surface so close to the surface of the evaporating liquid that the molecules of the liquid travel to the condensing surface without collisions. This technique enables very much lower temperatures to be used than are used with distillation at atmospheric pressure and therefore heat-sensitive substances can be distilled. Oxidation of the distillate is also eliminated as there is no oxygen present. Chemical Engineering A vacuum distillation used to separate and purify substances that would otherwise be adversely affected by distillation at a higher temperature. Using pressures of below 0.01 torr, the gaseous phase no longer exerts a significant pressure on (p. 242) the substance being evaporated. The rate of evaporation is therefore not dependent on the pressure since mass transport is governed by molecular dynamics and not fluid dynamics. Molecular distillation is used for the purification of oils, the manufacture of lubricants from petroleum, and the purification of vitamins.
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