Tower operating pressure

The answer to this question depends on whether you are doing the design or operating in the factory. 1. In the case of design work, when the steam temperature at the top of the tower is above 40°C, the pressure corresponding to the composition of that steam is considered to be the operating pressure (since, with a constant temperature, pressure and composition are directly related to each other). ), this range is quite large. However, in typical systems, an increase in pressure leads to a decrease in the relative volatility of the two substances, which makes distillation separation more difficult. Therefore, the pressure corresponding to 40°C is usually taken into consideration. 2. If it involves performing operations, just follow the flowcharts and operating procedures provided by the technical and design teams. It is sufficient to understand the impact of those operations on the product; there is no need to ask too many questions about why.