About distillation column operation
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I just thought of a question, what is the difference between increasing the top pressure of the normal pressure tower and raising the temperature at the same time and lowering the top pressure of the two to achieve the effect of lowering the temperature? We all know that the boiling point of high-pressure components increases and the temperature is required to increase. So is it good or bad to reduce the reflux flow? Please give me some guidance, master
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Don’t understand what the poster wrote? I suggest you ask questions carefully and communicate with others.
Don’t understand what the poster wrote? I suggest you ask questions carefully and communicate with others.
Landlord, do you mean to say: When the pressure increases, the temperature must be increased to meet quality requirements. So 1. Is there any difference between the effect of increasing the pressure at the top of the initial top and normal pressure tower and increasing the temperature at the same time, and the effect of lowering the pressure at the top of the two towers and lowering the temperature at the same time? 2. If the pressure rises, is it good or bad to reduce the return flow in order to raise the temperature? Personally, I think that the pressure at the top of the tower is generally not adjusted artificially. Even if it is affected by the amount of cold reflux, it should not be significant. Generally speaking, different oil products have different pressures objectively, and then the temperature is adjusted according to the pressure. The effect is to ensure qualified quality and high light yield, which should be the same. Lowering the reflux is also a common method, but it may result in less effective fractionation. I am also a beginner and my explanation is very one-sided. These are my questions too. Please help me all heroes.
In the case of an atmospheric tower, the temperature can be lowered by reducing the reflux flow, but reducing the reflux flow may cause the finished product to fail.； Increasing the reflux flow will cause the temperature to rise, energy consumption will also increase, and the purity of the product will also increase. There is a suitable reflux ratio in the middle. You will know it by yourself, and the design institute will determine the minimum reflow ratio for you in the early stages of design.