Seeking advice on changes in the feed composition of a distillation column
Thread Content
Changes in the feed composition have a direct impact on distillation operations; as the concentration of heavier components in the feed increases, the load on the distillation section rises. For a tower with a fixed number of rectification section plates, this will cause the heavier components to reach the top of the tower, resulting in substandard quality of the product at the top. If the concentration of the light components in the feed increases, the load on the stripping section increases. For a column with a fixed number of plates in the stripping section, this will result in incomplete evaporation of the light components in that section, leading to an increased loss of light components in the bottom liquid. At the same time, changes in the feed composition will also cause changes in the material balance of the entire tower and the process conditions. As the composition becomes lighter, the overhead distillate increases while the amount of liquid discharged from the reactor decreases. At the same time, the temperature of the entire tower decreases while the tower pressure increases. The component becomes heavier; the situation is the opposite. Among them, as the component becomes lighter, with all other conditions remaining unchanged, I think the loads on both the distillation section and the stripping section should increase, right? Because, for the same amount of heat, light components are more prone to volatilization. Similarly, shouldn’t the recombined fraction decrease as a whole? . . New to the chemical industry, seeking advice
Your question may be overlooking an understanding of the production capacity requirements for a set of equipment. For a set of equipment, its production capacity is valid under certain conditions; it cannot be changed arbitrarily. It is recommended that learning be systematic, following the approach of first focusing on processes, then on conditions, and finally on principles. For reference.
Light components have low boiling points, but their latent heat of vaporization is not necessarily low. The analysis earlier was good.