Can a peristaltic pump pump out of roto

[1234user]

Can you use a peristaltic pump pump out of a roto?

[greenbuggy]

Solvent or crude?

[1234user]

Solvent.

[thesk8nmidget]

Yes you can.

[cyclopath]

crude would make more sense.

solvent moves really easily (unless you’re not planning on breaking vac, in which case it won’t work anyway). most use vac to empty their rotovap receiving flask.

have you visited Optimizing your RotoVap ?

edit: @greenbuggy has tried emptying the solvent without cutting vac, if that’s your game, read on…

@greenbuggy

I don’t have any experience with a peristaltic on an SPD, but tried a few experiments with a peristaltic on the solvent flask of a rotovap under vacuum. What I found was that a 3 roller peristaltic allowed a lot of backwards flow/reversion to happen, moving liquid back towards the vacuum source, which slowed output considerably from what I saw from that same pump when it was pumping liquid from even pressure zones. I suspect to get descent flow characteristics you would need at least a 6 or 8+ roller pump in either application

[1234user]

@greenbuggy how low of a vac could you pump out of?

[greenbuggy]

We didn’t have a precision vac gauge on our rotos but we ditched the water aspiration vac pump and we’re using a 2 stage oil flooded pump, I’m sure it was at least -26 inhg