Why does the pressure distillation tower achieve such high separation purity? Seeking advice from experts
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Why does the pressure distillation tower achieve such high separation purity? Could someone experienced give some advice????
Separation purity has no direct relationship with whether pressure is applied or not. On the contrary, generally, a column achieves better separation under reduced pressure than under increased pressure.
Pressure increase and decrease take into account the effect of distillation temperature on the product itself, as well as the influence of the medium in the condenser and reboiler; the separation efficiency is primarily determined by the number of theoretical plates and the reflux ratio
:Shut up: Textbooks say that vacuum distillation helps improve separation efficiency, but in my opinion, for the same type of material, distillation is better carried out under pressure; however, the production capacity may decrease
This is determined by the properties of the materials. In a pressure tower, mixtures with similar boiling points have their boiling point difference increased through application of pressure; the lighter components are at the top while the heavier components are at the bottom. At an appropriate temperature and high pressure, the separation of the components becomes more thorough, resulting in a higher purity of the product
The purpose of applying pressure is to turn the material into a liquid at a temperature close to room temperature, which is suitable for separating mixtures composed of components with relatively low boiling points. Operating in low-temperature environments is more costly than in high-temperature environments. Of course, in theory, the relative volatility is generally higher at low pressures than at high pressures.
This is a methanol purification unit, right! ?