The effect of uneven gas-liquid distribution on the separation of heat-sensitive substances in packed towers
Thread Content
I use a packed tower to separate thermosensitive substances under negative pressure. One problem is that, even when the separation results are good, the product deteriorates. After ruling out some possible causes, I am wondering if the gas-liquid distribution affects the heating of the liquid as well as the separation process.
Vacuum is applied at the top of the tower; operation is carried out under negative pressure to lower the temperature.
According to research by FRI in the United States, a packing tower that is over 3.6 meters high generally requires a redistributor. In other words, when the packing section is within 12 feet, the gas-liquid distribution is satisfactory; beyond that, the edge wall effect becomes significant—efficiency drops and the gas-liquid distribution becomes uneven. The separation efficiency decreases ； It is inevitable that there will be uneven temperatures in certain areas.
Check the designed load of the tower; it might be that the tower is too large, with a large volume of liquid to be handled and a long material processing cycle. Side reactions are bound to occur, so the key is to keep things under control by minimizing the temperature difference between the reboiler’s heat source and the material. In short, use a lower temperature and ensure rapid processing