Location where the cooled material enters the reflux tank
Thread Content
After being cooled by air-cooled water at the top of the distillation tower, most of the material enters the reflux tank from its top, but some enters it from the bottom. What is the difference between these two ways in which the material enters the reflux tank? What is the reference basis?
The main considerations are phase change and maximizing heat exchange. In general distillation reflux systems, there are hot and cold streams; the cold stream enters from below the reflux tank, which is usually located above the cooler (except in the case of air cooling). The heat path enters from the return tank. If there is no phase change after the medium is cooled, or if a gas-liquid mixture exists, it enters from the return tank.
Two-phase flow enters from the top, while single-phase flow can enter from the bottom.
Two-phase flow enters from the top, while single-phase flow can enter from the bottom.
What the fellow sailors have said is correct; as for whether the materials should be fed in from the top or from the bottom, I think it should be determined based on the following two factors. First is the vapor-liquid phase separation problem ； Second is the issue of pressure balance. Vapor-liquid phase separation implies that it is more appropriate to feed the single phase from the bottom, such as in the reflux tank at the top of a stabilizer; if a vapor-liquid mixture is present, feeding from the top and allowing static separation is used. The pressure balance problem refers to the differences in pressure control methods used, such as the distinction between using a choke and a thermal bypass to stabilize the pressure at the top of the stabilizer