Liquid phase problems in distillation columns
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In the tower, the liquid phase becomes heavier from top to bottom, while the gas phase becomes lighter from bottom to top. There are roughly a kerosene section and a diesel section; the gas phase containing kerosene is carried downward by the liquid phase, and the kerosene-rich liquid phase moves downward into the diesel section. Is it heated and vaporized in the kerosene section, resulting in a continuous cycle of back and forth movement? ? ?
The mass transfer and separation process driven by the gas-liquid phase equilibrium in the distillation column: light components rise while heavy components descend
The distillation process involves multiple stages of vaporization and condensation. The three essential elements of a distillation tower are the heat source at the bottom of the tower, the reflux at the top of the tower, and an appropriate space between the trays: the heat source at the bottom provides the force that drives the light components upward, while the reflux at the top ensures that the heavy components move downward. The appropriate space between the trays allows the light and heavy components to come into contact with each other, enabling mass and heat transfer as well as multiple stages of vaporization and condensation. Your understanding of the post is correct; there’s a slight issue with the way it’s expressed. It is recommended to look for animations on distillation column mass and heat transfer online, as this will help in understanding the concept better.
The original poster’s analysis is basically correct!
An experienced person, could you help me? I’d like to ask where I can download animation or video tutorials related to petrochemical refining
Just search on Baidu for “distillation column mass and heat transfer animation” or “distillation column animation”; Baidu will help you. http://www.360doc.com/content/16/0603/20/1487284_564825361.shtml
According to Dalton’s law of partial pressures, it is crucial to control the temperature difference across the tray layers and maintain equilibrium in both heat and material flow; only by doing so can overlapping or voids between the upper and lower side streams be minimized to ensure quality.
In the tower, the gas and liquid phases come into counterflow contact, resulting in continuous partial vaporization and partial condensation. Heavier components in the rising gas phase move downward along with the liquid phase, while heavier components in the descending liquid phase move upward along with the gas phase, thereby achieving separation of the gas and liquid phases. The more trays there are, the higher the precision of separation