The process of stripping is a process of continuous exchange between the high boiling point components in the rising gas and the low boiling point components in the reflux liquid. As a result, the high boiling point components in the rising gas are continuously reduced until the top of the stripping section reaches the gas phase composition of the distillation raw material. Meanwhile, the low boiling point components in the reflux liquid are continuously gasified into the rising gas, The components with high boiling point in the rising gas liquefy continuously into the reflux liquid until there are only components with high boiling point in the reflux liquid. It can be concluded from the material balance that the low boiling point component lost in the reflux is the low boiling point component obtained from the rising gas. The high boiling point component lost in the rising gas is the high boiling point component obtained from the reflux. There is a problem here, that is, whether the molar number of components obtained and lost by the rising gas and the reflux is equal or not. This is not a matter of material balance, but a matter of heat balance. If the mole number of components obtained and lost from the riser and reflux is equal, that is, the high and low boiling point components are exchanged one to one during the distillation process, then the mole number of the riser and reflux remains unchanged during the distillation process. In fact, this is not the case. Because the heat of liquefaction phase transition of high boiling point component is not equal to that of gasification of low boiling point component, the exchange ratio of high boiling point component and low boiling point component is the ratio of gasification heat of low boiling point component and liquefaction heat of high boiling point component. Therefore, the gas-liquid ratio of the stripping section is not equal in different sections.
According to the above analysis, we know the composition of the rising gas at the bottom of the stripping section, the gas phase at the top of the rising gas stripping section, the liquid phase at the top of the reflux liquid and the liquid phase at the bottom of the stripping section. Thus, the minimum gas-liquid ratio can be obtained through the equations of material balance.
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