We call the process “Solvent recovery”.
As distinct from cannabinoid distillation.
Because that makes searching more fruitful.
“Ethanol” will also work better around here, or “EtOH”
Have you read about Optimizing your RotoVap
Or Who is king of EToH Recovery?
Rotovaps are not the correct tool….Glass has lousy thermal transfer compared to stainless. You might should explore Ethanol recovery maths if you really want to understand the problem.
Some are Using moonshine still for evaporation
Others are going the [Open Source Design Project] - Falling Film Evaporator route.
Membranes are probably the most correct solution, but you’re not recovering enough solvent to make them economically viable.