The vacuum level for vacuum distillation is not sufficient
Thread Content
For vacuum distillation, the ideal vacuum level is 2–3 mbar; in practice, only 6 mbar can be achieved. The pumping capacity of the steam jet pump is not a problem, and helium leak testing has also been carried out, but the results are not satisfactory. How can this be resolved? Is there a high-temperature resistant vacuum sealant?
Check the saturated steam pressure and nozzle installation; high-temperature resistant vacuum sealant isn’t very useful in this case, and checking the gasket installation will resolve the issue.
The original poster has raised a very good topic; from the content perspective, it seems to be a problem related to production processes.
The seal is not good; please conduct a thorough inspection
In addition to the steam jet pump, a vacuum pumping system also includes components such as coolers, rehumidifiers, and condensate tanks. If the negative pressure is not achieved, it’s not sufficient to focus only on the steam jet pump; there may be other leakage points in the entire system, and factors such as the temperature of the waste gas also have an impact. :lol
The device’s capacity isn’t enough, right? Check the design parameters.
If it is a single draw, check whether the capacity is sufficient, and then consider factors such as air leakage and condensation effects. Do you mean sealant for air leaks? If multiple draws are made, it is possible to balance the issue. Are there any issues with the equipment as well? I’ve encountered situations in the past where design capabilities, as well as operation and cooling, all had an impact.
For problems of this kind, it is most likely an issue with the steam jet pump. The equipment should have undergone a leak test before being put into operation, so there shouldn’t be any problems. All the connection bolts related to negative pressure should be tightened twice at temperatures of 150–220 degrees. A thorough analysis is necessary here
It could be a device issue or a sealing problem; it depends on the results of the actual inspection