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This post was last written by wx_ Edited at 2023-3-16 03:34,
It is recommended that you ignore the weight of the components first. It is relatively easy to understand from the principle of the "distillation" process of two substances. The heat transfer between the downstream liquid and the rising steam at the relative saturation temperature, the volatile components and the less volatile components can be separated according to their respective properties in the process of absorbing heat and releasing heat. For reference.
Are you sure the MSDS data is correct? This pyridine is a bit strange. The melting point is 76-78°C and the boiling point is only 103°C. What does the o.5kpa after 103°C mean? My personal suggestion is to check the physical properties again. The boiling point of this pyridine should be more than 103℃
Please check the boiling point clearly. Morpholine has a boiling point of 128°C at normal pressure, and pyridine has a boiling point of 103°C at a negative pressure of 0.5Kpa. In other words, the boiling point of pyridine is almost 200 degrees Celsius at normal pressure.
Pyridine has such a high melting point, so its boiling point is at least above 200°C, 103°C at 0.5kpa. Morpholine is liquid at room temperature, and its boiling point at normal pressure is only 128°C.
Suddenly, I didn't notice the 0.5kpa after the boiling point of pyridine. It turns out that the boiling point at a negative pressure of 0.5kpa is 103. Careless, careless
From the top of the tower or the bottom of the tower, you have to look at the boiling point of the substance under this pressure to distinguish the light and heavy components, not the boiling point at normal pressure.
The boiling point of morpholine is about 68°C (0.5KPa), and the same boiling point of pyridine is 103 (0.5KPa). Therefore, in the vacuum distillation tower (vacuum degree is 100㎜hg), morpholine is extracted from the top of the tower as a light component, and pyridine is extracted from the tower still as a heavy component.