Vacuum pump suggestions plz

[Carrierwave]

I'm in the market for a vacuum pump, looking at pumps that can do 28" of vacuum. I'm going to be buchner filtering through qualantative paper, distilling under a mild vacuum, and whatever else a home chemist would do that I'm not aware of. Will 28" cut it? Thank you!

I understand that the micron rating is used for lab vacuum pumps, but that scale doesnt bear much reference to me.

 

[benzyme]

anything from 21-27" is fine for common tasks such as filtration; strong vac will suck material right through the filter paper.

look for a diaphragm pump.

 

[Rivea]

I have used too strong a vacuum source during filtration and learned the hard way that you'll rip the filter paper. If you get a pump capable of a strong vacuum, then you will need to regulate the vacuum. Also I would suggest that you use a trap to avoid getting liquids in your pump.

 

[Carrierwave]

Right, I forgot about filter paper ripping. It will have a liquid trap. Thanks for the diaphram suggestion as well.

 

[The Day Tripper]

I purchased a 500ml filterflask with a rubber seal and a 70mm porcelain butchner funnel for 18.95 at Local Settlements|Virtual Accounts|Global Money Transfer|PayFX|Agile FX|England.

Heres the link: http://www.agile-fx.com/servlet/the-2518/Filtration-Kit-w-fdsh--70mm/Detail

I needed a vacuum pump to complete my filtering setup so i purchased this off ebay:

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=330337502331

As far as i know, after lots of web browsing and searching this was the best deal for a filtering setup. I have no issues with this combo and it works very well for rue extractions. Esp. HCL manskes, was able to filter almost 6g of crystals with one filter paper.

 

[justine]

If you want a hand-powered vacuum pump the best you can find is from Mityvac (esp. the "silverline").

 

[Carrierwave]

If you want a hand-powered vacuum pump the best you can find is from Mityvac (esp. the "silverline").

Already own one, thank you.

 

[benzyme]

hand-vac, as you can imagine, is limited to filtration. if you want to do other applications,
such as vac-distillation, sublimation, and/or vac-desiccation, a diaphragm, rocking-piston, or rotary-vane pump is recommended.
if you need to do distillation or sublimation of high-boiling compounds, you'll want a rotary-vane pump capable of pulling down to the low-micron range; check the specs.. CFM is not important in this context, absolute pressure is more important.