Can increasing the height of the distillation tower reduce impurities in this product?
Thread Content
The boiling point of the product is 306°C; the impurity is total chlorine, with the specific substance unknown. This impurity has a boiling point higher than that of the product, though it is not known by how much. Currently, the level of total chlorine in the product is around 200 ppm, and it is necessary to reduce this level to below 50 ppm. The tower is a type of the simplest packed tower; at its 10-meter-high top there is a small 5 m² condenser used to control the temperature at the top of the tower in order to ensure proper quality. Vacuum distillation is employed, and although reducing the temperature at the top of the tower can lower the level of impurities, it still does not meet the required standards. I am considering increasing the height of the tower – do you experts think this is feasible? Or what would be the effect?
If it is at the design stage, it can be considered； If, during operation, it is considered appropriate to increase the circulation rate and the amount of alkali added ； If maintenance is planned, you can contact the packing manufacturer to determine whether it is possible to replace the packing in order to increase its residence time in the tower.
Yes, if it is necessary to increase the reflux ratio during actual operation, this is achieved by increasing the circulation volume of the liquid inside the tower
During design, if proper calculations are not carried out, or in other words, if insufficient margin is reserved, this tower requires re-calculation of the manufacturing process before it can be constructed； Do not assume! The high level of total chlorine (residual chlorine) in the product is related to the height of the tower as well as the type and height of the packing; it is calculated based on the physical properties of the substances present in the medium ； In vacuum distillation, there may be reasons for the condensation of the product; I suggest checking these aspects ； Hope this helps!
Substances containing PPM levels can be distilled, but it is difficult to meet the separation requirements.
We can use our patented packing: Gufeng high-efficiency packing, which has a theoretical plate count twice that of ordinary packing; it is particularly suitable for processes with small temperature differences. Please call me for more details.
I feel the same way. If there are pilot or lab-scale testing facilities, it would be worth giving them a try first
Distillation from 200 ppm to 50 ppm is not impossible; I have done it before. It certainly requires adjustments in the operating parameters, and these operations need to take into account the type of packing being used. In many cases, the operating conditions have a significant impact on the efficiency of the packing – it’s not true that the higher the reflux ratio, the better
For formula restoration and formula analysis, turn to me. You can subscribe to the official account: peifangfen*, a leader in the field of fine chemicals