Vacuum Distillation Setup on a Budget

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SUMMARY

The discussion centers on setting up a vacuum distillation system on a budget, specifically targeting a vacuum level of 10 Torr. Participants suggest that using a standard air compressor is inadequate for achieving this pressure, as it typically cannot reach below 2 psia even with modifications. Instead, a single-stage rotary vane vacuum pump is recommended, which can be found used for approximately $50 on platforms like eBay or Craigslist. Additionally, users are advised to ensure their glassware can withstand the vacuum pressure to prevent implosion.

PREREQUISITES
  • Understanding of vacuum distillation principles
  • Familiarity with rotary vane vacuum pumps
  • Knowledge of aspirators and their specifications
  • Basic skills in modifying and connecting pneumatic systems
NEXT STEPS
  • Research the specifications of rotary vane vacuum pumps suitable for achieving 10 Torr
  • Explore options for purchasing used vacuum pumps on eBay or Craigslist
  • Learn about the capabilities and limitations of air-powered aspirators
  • Investigate safety measures for using glassware under vacuum conditions
USEFUL FOR

This discussion is beneficial for hobbyists and professionals involved in vacuum distillation, including chemists, DIY enthusiasts, and anyone looking to set up a cost-effective vacuum system.

GiTS
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Hi GiTS. I really don't think that will work. Even if modified to reduce piston ring leakage, it's only a single stage, so I doubt it would get below ~2 psia assuming it was properly modified. But modifying that is going to be more expensive than just getting a real vacuum pump.

Try ebay or Craigslist. A used one can be picked up for about $50 from what I've seen.
 
I don't want to turn the compressor into a vac. I want to hook the output up to a compressed air powered aspirator. But I don't know how much horsepower I need to get the aspirator to pull 10 Torr.
 
I should think the specs of the aspirator would tell you.
 
Incidentally, 10 Torr is well within the capabilities of a single-stage rotary vane pump, of the type used by HVAC repairmen. I have one I use for various nefarious vacuum-related experiments.
 
thanks for the tip. I think this might be perfect
http://cgi.ebay.com/Rotary-Vane-Vacuum-Pump-29%22Hg-3-CFM-1%2f4-HP-AC-HVAC-Tool_W0QQitemZ390068911886QQcmdZViewItem
 
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29 in-Hg of vacuum works out to 736 Torr below atmospheric (which is nominally 760, depending on where you live / work).

May want to make sure your glassware can handle that without imploding (assuming that you in fact reach the ultimate pressure of the pump).
 
  • #10
You need one more like this one:

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=390066833029
 
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