May I ask what the difference is between a fractional distillation tower and a distillation tower?

There shouldn’t be a big difference; the principle is the same, with only slight variations in specific applications.

Today is the second time I’m responding to your discussion question. There is a significant conceptual difference between a fractionating tower and a distillation tower: A fractionating tower is generally used to separate all or most of the low-boiling-point impurities from the top of the tower, so as to obtain a product at the bottom with a relatively low impurity content for further processing. Therefore, fractionation serves as a pre-treatment step in the product purification process. In fractionation operations, the distillates from the top of the tower are usually mixtures that also contain some of the components from the bottom of the tower. Moreover, the separation requirements in fractionation are generally not strict (otherwise it would be distillation); unless the fractionation ratio is very high (in which case the yield of the product at the bottom **decreases**), the product at the bottom also typically contains impurity components from the top of the tower. Fractionating towers usually have a limited number of theoretical plates, and the reflux ratio used in operation is also low； Distillation columns are generally used to separate products of higher quality from either the top or bottom of the column; they typically have a relatively large number of theoretical plates, and there are strict requirements regarding the reflux ratio during operation. The main difference between distillation and fractionation is that distillation demands high separation efficiency in order to obtain the desired product at a high yield. In other words, for distillation, the concentration of key components in the material at the top of the column must be strictly lower than a specified value, and vice versa for the material at the bottom of the column. Simply put, distillation is an important method for separating products of high quality with high yields, while fractionation is usually used as a pre-treatment step before product refinement. Fractionation can be employed as a means of obtaining a product only when the quality requirements are not high or when there is a large difference in boiling points between impurities and the product.

Does a distillation column have a rectification section and a stripping section? Or does a distillation column only have a rectification section?

The products separated by fractional distillation have low purity, while those separated by rectification have high purity. What is the relationship between fractional distillation, distillation, and rectification? ?

I completely agree with the view from the third floor; the principle behind fractional distillation and distillation is the same, but there are slight differences. Otherwise, there would be no need for separate terms like fractional distillation and distillation in the field of chemical engineering

Right, multiple distillations is what’s known as rectification; it essentially involves multiple flashes for equilibrium, resulting in an increasingly high degree of separation~~~

The precision requirements for distillation are not as high as those for rectification; it is generally used for the preliminary separation of products, especially when there are many different components involved. A distillation column is employed to obtain various products from different sections of the column. For example, in the catalytic cracking process, the material coming out of the reactor enters a product stabilization column, which functions as a distillation column. Rectification columns, on the other hand, are used when very high quality of the product is required.

Both fractionation and rectification are terms translated from English; their principles are the same, as they are both based on gas-liquid equilibrium, mass transfer, and heat transfer. In my opinion, the difference lies only in the degree of separation of the feed: fractionation columns are generally used for simple separation or as a pre-treatment step for the feed to a rectification column, simply to separate light and heavy components. - Compared to fractional distillation columns, rectifying columns can achieve a more precise separation of the feed, with strict and high purity requirements for the products taken from the top, bottom, or side streams of the column.

Agreed; both fractionation columns and rectification columns include a rectifying section and a stripping section