2. The pressure range of crude vacuum distillation is 1.O*104Pa-2.7x102Pa, and the gas flow is viscous. Distillation operation within this pressure range is easy to achieve.
3. The pressure range of low vacuum distillation is 2.7*102Pa-1.OPa. At this time, the gas is close to the transitional flow state, and there are strict requirements for the selection, design, manufacture, installation and operation of vacuum distillation unit.
4. The pressure range of quasi-molecular distillation is 1.0-1.0*10-2 Pa. At this time, the average free path of the gas molecule is similar to that of the distiller, and the gas is in a transitional flow state.
5. Molecular distillation operating pressure is below 1.33*10-2 Pa. In molecular distillation or quasi-molecular distillation devices, the flow of gas is the free movement of molecules, that is to say, the collision and interference of other molecules in the system can be ignored. At this time, the distillation process is dominated by evaporation from the liquid surface.
没有评论:
发表评论