I hope someone can help me identify the issue. I’ve spent the entire day taking my 50L Rotary Evaporator apart and I can’t locate the issue.
It seems that the system is struggling to maintain a vacuum. The odd part is that it can hold a vacuum (around 0.095 MPa) as long as the boiling flask is oriented a certain way. If I rotate it 180°, there is an audible leak and pressure quickly increases back to atmospheric pressure.
Does anyone have any suggestions? I took out all the gaskets, changed them, greased everything, and the problem persists.
What direction does it hold vac?
The problem is somewhere in your rotery seal.
Ps: Dont use grease in a rotovap rotery seal, the etoh might not dissolve it, but other solvent like hexanes will eat it. Thats product contamination just waiting to happen.
This can also be caused by a defective vapor tube which I observed with smaller units. If the vapor tube is not 100% straight it can warp the gaskets while at certain rotational positions while working fine in others. I had this problem when buying replacement parts from Ace but with ones from the original manufacturer it worked fine.