Molecular distillation

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Molecular distillation

Key words: experimental instrument

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Scientific instruments are tools for precision measurement, and their precision and reliability must be an order of magnitude higher than the object being measured. Therefore, although there are not as many components as airplanes, the systematic design is also beyond imagination. The chromatographic column, as a consumable, is a separation center, just like the heart. High pressure, tightness and flow rate stability are required. And the oven needs to be kept at a constant temperature. To prevent leakage, maintain constant temperature, pressurized flow, every link, can not be slack. For materials, seals, and fluid mechanics, a high foundation is required.

The method for checking whether the instrument leaks: pinch off the external vacuum skin tube, and observe whether the vacuum gauge on the instrument can keep the instrument leak-free for five minutes. If there is air leakage, check whether the sealing ring on each sealing joint and rotating shaft is effective. On the contrary, the instrument is normal to check the vacuum pump and vacuum pipeline.

Molecular distillation is a physical separation method used to separate liquid mixtures. It is based on the boiling point difference of different substances, by heating the mixture, the lower boiling point of the first evaporation, and then condensed collection, so as to separate the target substance.

In the process of molecular distillation, the mixture is heated to the boiling temperature, the liquid part begins to evaporate, and the steam passes through the fractionation column. The column is equipped with packing to increase the surface area and improve the separation effect. The lighter components evaporate more easily, enter the condenser through the top of the column, and become liquid after cooling. The heavier components are retained in the fractionation column and collected by the collection device after the liquid is evaporated.

Molecular distillation is suitable for liquid mixtures where the boiling point differences between different components are small. For example, it can be used to separate a mixture of alcohol and water, because alcohol has a lower boiling point than water. In addition, molecular distillation is also widely used in chemical processes in petrochemical, pharmaceutical and other fields to extract pure compounds.

In short, molecular distillation is a method of separating substances with different boiling points in the vapor state by heating the mixture. It has important application value in material separation and purification.

Molecular distillation

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