side-line distillation
Thread Content
In vacuum distillation with a side stream for product extraction, gas-phase extraction is used, at the lower layer of the feed plate where pressure and temperature are normal; however, the heavy components in the side stream product exceed the specified limits. I would appreciate it if experienced colleagues could advise me on the reasons for this and possible solutions.
“\"Side-line extraction,\" and again a new term is used: lol. To discuss such issues, flowcharts are necessary, as distillation towers have a wide range of applications. Generally, as long as the process conditions are within the designed range and the operating procedures are followed strictly, no problems will arise. Unless there are special circumstances such as tower blockage, leaks, or other distillation abnormalities caused by improper operation such as flooding.
Old chemical workers talk about extraction; “recovery” is a term used by manufacturers that has become popular in the mainland. The term \"production in the interior\" refers to the amount of oil and gas extracted from wells, such as the degree of extraction and the extraction rate.
Distillation is a systematic issue; without complete information, it is impossible to analyze the specific causes. It could be due to an increase in the composition of the feed, insufficient reflux flow, or a fault with the tray
Check whether the feed composition differs from the design; if the concentration of the heavy components is too high, it will result in an excessive level of such components in the product stream. If the pressure is normal, it indicates that there is no issue with the flux through the trays. However, check whether the temperature at the bottom of the tower is too high. Also, examine whether the reflux rate at the top of the tower is too low, as this could cause a shift in the gas-liquid equilibrium
What I’ve learned is that side-line discharge occurs at the trays above the feed plate, for both the gas phase and liquid phase discharges. In your case, since discharge takes place below the feed plate, the concentration of Reorganization components is higher. You can see this by looking at my side-line discharge operation diagram