Hey guys. Was searching around for a transfer pump that is both hexane rated and not going to break the bank. I would like to use a pump to transfer < 5L of Hexane/CBD into my 5L reactor. So far we have been heating hexane & CBD in a pot on a hotplate and the pouring via funnel into my reactor, but I REALLY don’t like doing that and would love a safe & easy way of getting the solvent mix into my reactor. I would love to use a magnet drive pump but I am not sure if they will work with hexane or not. I thought about using an air operated double diaphragm pump, but it seems overkill for such small volume I am working with. Does anybody have any elegant solutions to this problem?
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If you want cheap, a trs21 can do the job
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How well will that pump tolerate a 1:1 hexane:CBD mixture?
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Oh lol probably not well at all.
What kind of vessels do u have on hand?
Something like this would work well if you have a pot to pressurize
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We don’t really have any fancy solvent vessels. Currently we are using a hand pump to pump the hexane out of a barrel into a stainless pot that we put on a hotplate to heat it up and dissolve the CBD. I was hoping to find a pump that i can drop one hose into my pot and feed the other hose into the port on my reactor.
Okay, yeah I see what you mean. Unfortunately I don’t have any vessels that would be suited to using positive pressure displacement.
I’m sure someone will have a better answer
Dude I appreciate your info! My lab is super redneck at the moment because I’m trying to save up $$ to invest in much better equipment. Just trying to make my janky lab a little safer and work a little better for the time being.
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Would anyone know if using this pump would work? I figured I might open it up and change the o-ring out for viton.
Lol that diptube I posted is super redneck 
Hey, it looked cleanly built!!
That mag drive pump looks perfect, but I’d be concerned about what the o ring is made of since it’s meant for beer and not hydrocarbons.
Simple thing to just swap it to a viton o ring if it’s not already
Thats exactly what I was thinking. Figured I could pop it open and throw a viton o’ring in there and call it a day.
Use a diaphragm pump hooked up to an air compressor. There are cheap ones rated for hexane.
Gimme a sec.
I bought mine from here.
https://www.hardwarefactorystore.com/products/diaphragm-pump?_pos=5&_sid=78ce8b958&_ss=r
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Pull vacuum on your reactor and suck the solution in. I move almost all my solvent around my facility with vacuum.
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I can attest to the functionality of the vacuum pull too.
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it’s also safer and does not need specialized pumps, making it 100% more economically and environmentally attractive.
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Honestly that sounds much easier than dealing with pumps. So pull vac on the top of the reactor and then use another fitting with a hose on it to pull solvent in? Should it have a dip tube on the solvent in side to prevent liquid from going into the vac line?
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Gravity alone will prevent that if the liquid isn’t splashing like crazy or you’ve overfilled the reactor. Better put a Woulff bottle between the reactor and the vac source to catch droplets.
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You shouldn’t need to have the vac pump on while your doing this, just building up vac in your reactor and closing it off will work.
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