reciever bend with vent as ghetto vaccum reciever?

dooga · Mon Aug 22, 2005 2:01 pm

swid is endeavouring to vacuum distill various substances but he doesnt as yet have a vacuum reciever for his glassware setup, all he has is a reciever bend with a vent, will this suffice? or is it not worth the trouble?

swid has searched very widely but has yet to find this question asked anywhere else

hAzzBEEn · Mon Aug 22, 2005 9:23 pm

You need a sealed system to create the vacuum. If your bend is open to the atmosphere there is no way to pull a vacuum.

dooga · Tue Aug 23, 2005 9:46 am

sorry, but swid should have been clearer

the reciever bend has a 24/29 socket and cone but at the bend point of it, it has a vent coming out, swid's question was if a vacuum source could be attached to that vent as to create a sealed system and hence a vacuum

but some main concerns are if it will cause the condensed liquid to flow into the recieving flask or if some vapour will be sucked into the vacuum tube

its hard to describe unfortunately

Vitriodor · Thu Aug 25, 2005 3:20 am

That sounds like a vacuum adapter to me....but your second remark I don´t understand. Normally you want your condensed liquid to end up in the receiving flask. If you don´t have a good separation of the dripping liquid and the opening to the vacuum pump than you might have a possibility that liquid is lost. And as long as your cooling system works ok, not much vapour will be lost. Is the "receiver bend" you´re talking about something like this ? Probably you are missing the inner glass tune.

http://www.bluffton.edu/homepages/facstaff/bergerd/classes/LabEquip/vadapt.html

nubee · Master Archiver

the sort he's talking about is the following and there may be a possibility of stuff getting sucked up:

ApprenticeCook · DILLIGAF

the vent is meant to prevent pressure buildup, if you apply vacuum to the above picture you will more than likely suck up alot of your distillate...
You need to have the proper vacuum reciever which is designed to not suck up distillate. Or some ghetto interpretation thereof.

-AC

nubee · Master Archiver

never seen or tried this , but here's a "ghetto" modification that would turn it into a recieer adapter with vacuum connection: Very Happy

the tube might need to be a couple of different sizes of silicone tubing joined together-

bio · Working Bee

Silicone? oooh not good for acids, bases and many solvents.

http://nalgenelab.nalgenunc.com/techdata/Chemical/index.asp

http://www.coleparmer.com/techinfo/ChemComp.asp

Use HDPE or PP thin wall tubing.. Feather the inlet and angle cut the drip end. Place in boiling water to soften when working the tubing. A tight fit is needed into the male end of the condenser.

Sektor · Sun Aug 28, 2005 5:52 am

and you guys call that ghetto...