May I ask about the yield issues in batch distillation and continuous distillation?

It also depends on the equipment, properties of the materials, operating conditions, operating environment, and even the operators; it is recommended to track the original data for comparison

Reply to 1# ding6389, Hello, original poster! There is a fundamental difference between batch distillation and continuous distillation; in batch distillation, the entire column serves as a distillation section, with no stripping section. Therefore, to obtain a product with the same top and bottom composition, the energy consumption of batch distillation must be greater than that of continuous distillation. The yields involved are not comparable.

Hello, I have two questions. 1. Why can’t intermittent distillation have a stripping section? Wouldn’t it be good to have both a stripping section and a distillation section? 2. I took a look at the definition of batch distillation – it seems that only the product from the top of the tower can be obtained; isn’t it possible to get the product from the bottom of the tower as well? Thank you!

If all of these are present, then it is continuous distillation; in batch distillation, feed is added batch by batch, and the sections of the column located above the distillation vessel all belong to the distillation section

The definition of batch distillation is a distillation unit that has both a distillation section and a stripping section, with feed supplied intermittently and discontinuously. But isn’t this also considered batch distillation?

As far as I know, the biggest difference between batch distillation and continuous distillation lies in energy consumption and control time. I used to work with trichloroethylene, using continuous feeding and continuous removal. Some replies stated that the material could only be removed from the top of the tower, not from the bottom; that’s incorrect. It depends on what your tower is used for. For example, if the tower is used to remove low-boiling substances from a material, what is obtained at the top of the tower are useless waste products, while what is obtained at the bottom of the tower is what we need. If a tower is used to remove the high-boiling substances from a material, the desired material is generally taken out from the top of the tower, while the high-boiling substances are basically discharged directly after the operation is stopped. Whether to use continuous distillation or batch distillation depends mainly on whether your material contains a large amount of high-boiling compounds. If there are many such compounds, and they need to be removed after each batch, then batch distillation is necessary. After completing one batch, the process is stopped and the waste materials are removed, in order to prevent the high-boiling compounds from clogging the pipes or resulting in low yields of the material.