Saganism
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Good starter vacuum?
I'm writing this topic to hopefully get some reviews or opinions on whether or not the vacuum listed is a good vacuum to start off with. What are the
differences between diaphragm pumps and rotary vane? I believe thats the two different types.
Is this a good vacuum to start?
http://www.harborfreight.com/25-cfm-vacuum-pump-98076.html
Just trying to figure some stuff out you know?
Aren't we all?
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Hexavalent
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There are numerous threads discussing vacuum pumps, please UTFSE.
For vacuum filtrations and some distillations, I'm sure that pump will suffice. Actually, for some filtrations, it may even be a trifle strong, but
the vacuum it pulls can be regulated.
However, I don't think the innards are made from PTFE or another fluroropolymer (probably aluminium or a steel), so you may have some issues with the
vapours you pass through the pump.
"Success is going from failure to failure without loss of enthusiasm." Winston Churchill
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Saganism
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Thanks. Would a trap with something to absorb the vapors work? perhaps bubbling it through water? or would that not really be possible?
Just trying to figure some stuff out you know?
Aren't we all?
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Hexavalent
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Ideas for a trap were discussed here;
http://www.sciencemadness.org/talk/forumdisplay.php?fid=5
I'm still looking for something suitable for my own pump, actually. Ideally, you need a dessicant to absorb water vapour, and an acid/base scrubber or
similar to absorb gases such as HCl, SO2, NOx, NH3 etc.
"Success is going from failure to failure without loss of enthusiasm." Winston Churchill
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CaliusOptimus
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Those harbor freight pumps are fine for non-corrosive work. I've used mine directly for distilling glycerol. For anything else you will definitely
need a regulator or needle valve. A gauge is convenient as well, like a mityvac tee'd into the line. Has anyone mentioned TFSE?
Thread saver:
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Hexavalent
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Yes, I have 
Magpie has a post somewhere on the forum showing his use of a 'T' adapter to incorporate a vacuum gauge into the vacuum line during a distillation,
and it has been shown here several methods of controlling the strength of a vacuum;
https://www.sciencemadness.org/whisper/viewthread.php?tid=21...
https://www.sciencemadness.org/whisper/viewthread.php?tid=22...
"Success is going from failure to failure without loss of enthusiasm." Winston Churchill
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Saganism
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Thanks for the info.
Just trying to figure some stuff out you know?
Aren't we all?
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turd
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How can a pump be too strong for vacuum filtration? It's not like you could ever reach significantly more than 1 bar of pressure difference just by
applying a vacuum. The question is rather who in his right mind would use a rotary vane pump for vacuum filtration?
Edit: Ugh - stupid error.
[Edited on 6-1-2013 by turd]
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Mailinmypocket
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Since my manual vacuum pump broke a few months ago I have been using a rotary vane pump for filtrations, with a bleeder valve, vac gauge and various
traps depending on what is being filtered. It is a pain in the ass, but if you put thought into the set up it isn't all that bad.
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photoelectrical
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Would a coleman quickpump (used for inflating/deflating air mattresses) work well as a vacuum pump for distilling nitric? with a baking soda/water gas
washer?
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Saganism
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So, turd, as for vacuum filtrations, I have a water aspiration I haven't setup yet. I'm looking into a recycling aspirator pump system. Could a simple
'king- 160 submersible pump' provide enough force in my aspiration for efficient filtration? I believe it would.
Just trying to figure some stuff out you know?
Aren't we all?
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