Could some expert please explain how to interpret the graph of this extraction distillation column?

The curve graph of the extraction distillation tower is primarily used to show how physical properties such as temperature and pressure inside the distillation tower change over time under different operating conditions. Generally, an extraction distillation tower is a device used to separate a mixed liquid into multiple components. It achieves fractionation in the distillation tower by taking advantage of the different boiling points of the various components. A graph usually shows several curves, with each curve representing the change over time in the temperature or pressure of a different component. These curves are usually S-shaped, indicating that temperature or pressure gradually increases or decreases over time. Graphs can help us understand the performance of distillation columns under different operating conditions. For example, when we change operational parameters such as the feed rate or cooling flow rate, we can observe the graphs to determine the corresponding changes in temperature and pressure, thereby adjusting these parameters to achieve a better separation effect. Furthermore, graphs can also be used to analyze the gas-liquid flow inside the tower. For example, when the curve shows a steep upward or downward trend, it may indicate strong gas-liquid interactions, and measures may need to be taken to improve the separation of the fluids. In summary, by understanding the graphs of extraction distillation columns, we can gain a better understanding of their working principles and performance, thereby enabling optimized operations and improved equipment design. .