Reduce the light components in the product at the bottom of the tower
Thread Content
The light component content in the bottom product of the tower is too high; what measures should be taken? For reflux, is it better to increase it or decrease it?
Is it continuous distillation or batch distillation? If it is continuous distillation, increase the height of the feed inlet. In case of batch distillation, as the light components evaporate, the amount of light components at the bottom of the tower gradually decreases.
Would adjusting the reflux help? In a stripping column, increasing the reflux can reduce the content of heavy components in the product at the top of the column; what about a stripping column used for light components?
Reducing backflow is useful; the light components will decrease, but the loss of heavy components will increase
The most appropriate approach would be to increase the heat load on the tower bottom and the reflux ratio (which will also increase the load on the condenser). If the load is not increased, the reflux should be reduced, resulting in the situation shown on floor 3.
Could LZ explain the process clearly? Otherwise, it’s difficult to give an accurate answer. In the case of continuous distillation, it is necessary to analyze the feed composition to determine whether the content of light components is too high If so, increase the heating capacity of the reboiler; with the reflux volume kept constant, increase the draw rate (thereby indirectly reducing the reflux ratio) ； If not, it is necessary to increase the heating capacity of the reboiler. If the components at the bottom and top of the analysis column meet the requirements while the proportion of heavy components at the top increases, then the reflux ratio should be increased appropriately.
Continuous distillation. The heavy fraction from the tower bottom is the product we want. The content of light components is not high: 1–2 kppm at the top of the tower, and a few ppm at the bottom of the tower. However, we have high requirements for this light component, and we would like to reduce it further, even to the point where it cannot be detected. Some products are sacrificed for this purpose.