There is a large amount of bubbling inside the sight glass of the overhead product line of the vacuum distillation tower
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It is a vacuum distillation tower with a vacuum level of -0.095 MPa; the flow rate is controlled by overflow from the reflux tank at the top. A sight glass is installed on the overflow pipe, and a large amount of bubbling is observed inside it. I would like to ask everyone what causes this bubbling? 2081
If the composition at the top of the tower is close to that of a single pure substance, the top of the distillation tower usually consists of a gas-liquid mixture of that substance. Under these pressure conditions, the relative saturated vapor pressure results in incomplete liquefaction, thereby forming bubbles. If the composition at the top of the tower is not a single substance, and there is a component with a boiling point slightly lower than that of the main substance, then under those pressure conditions its relative saturated vapor pressure will also result in incomplete liquefaction, leading to the formation of bubbles.