Sciencemadness Discussion Board

what sort of pump do you guys use

BILLBUILDS - 13-3-2017 at 12:32

what sort of pump do you guys use. i just connect mine directly to the garden hose and put it on as low as possible and higher if doing a reflux and the vapour are getting to high up the column. sorry for the noob question

BILLBUILDS - 13-3-2017 at 12:45

also if someone could suggest one from ebay (not US the postage is to high) so one from china

adk - 13-3-2017 at 12:52

I use a KNF or Vacuubrand dual stage diaphragm pump for evaporation and filtering. A couple of air conditioning dual stage rotary vane pumps obtained from eBay ($200 AUD!) for high vacuum distillation/schlenk lines.

BILLBUILDS - 13-3-2017 at 15:19

i meant a water circulating pump but tell me about these vacuum pumps., are they only $200. i use a stainless steel aspirator to pull a vacuum. when looking for a vacuum pump what sort of stats am i looking for, flow rate? motor power? ultimate vaccume?

would this sort of thing be good for me (im poor)


[Edited on 13-3-2017 by BILLBUILDS]

[Edited on 13-3-2017 by BILLBUILDS]

[Edited on 14-3-2017 by BILLBUILDS]

anewsoul - 13-3-2017 at 17:59

Look for fountain pumps made for outdoor garden fountains. Shouldn't be too expensive and they recirculate water so its not very wasteful. Here's an example of one

[Edited on 14-3-2017 by anewsoul]

wg48 - 13-3-2017 at 18:24

Quote: Originally posted by anewsoul  
Look for fountain pumps made for outdoor garden fountains. Shouldn't be too expensive and they recirculate water so its not very wasteful. Here's an example of one

[Edited on 14-3-2017 by anewsoul]


I doubt that would produce sufficent pressure to drive an apirator pump to produce significant vaccum. The water circulator pump flow rate and pressure needs to be matched to the aspirator's required water flow rate and pressure to acheive its spec vaccum.

Sulaiman - 14-3-2017 at 01:57

Mostly I use the garden hose :)

but if I want an ice-water circulating system I use one of these tiny usb water pumps
http://www.ebay.co.uk/itm/USB-DC-3-5V-9V-3W-Submersible-Wate...
so far it has been sufficient for my 24/29 system.

EDIT : the pressure is minimal, ice-water bath/reservoir height is important with such a small pump.
for portability http://www.ebay.co.uk/itm/External-2600mAh-Portable-Power-Ba...
or better

[Edited on 14-3-2017 by Sulaiman]

BILLBUILDS - 14-3-2017 at 12:24

i dont need a pump for the vacuum i need one for vacuum and one for water circulation

adk - 14-3-2017 at 12:49

Quote: Originally posted by BILLBUILDS  
i meant a water circulating pump but tell me about these vacuum pumps., are they only $200. i use a stainless steel aspirator to pull a vacuum. when looking for a vacuum pump what sort of stats am i looking for, flow rate? motor power? ultimate vaccume?

would this sort of thing be good for me (im poor)

[Edited on 13-3-2017 by BILLBUILDS]


[Edited on 13-3-2017 by BILLBUILDS]

[Edited on 14-3-2017 by BILLBUILDS]


I have one similar to this:
http://www.ebay.com.au/itm/BRAND-NEW-DOUBLE-2-STAGE-3-CFM-RE...

and in terms of water pumps; I either use a Julabo recirculating chiller with ethylene glycol or a 600L/h aquarium pump in ice water $10 on eBay if I need additional cooling. Having an ice machine in the lab is very helpful in this case - our lab has one shared between all the businesses.



BILLBUILDS - 15-3-2017 at 11:10

what about this

or something like this

Liamatpm - 22-3-2017 at 16:40

I use a normal fan for venting and a general purpose hand pump from my local hardware store (they also sell it at Walmart for ten dollars) it is good at being a liquid pump and a somewhat okay vacuum pump, I can get to -21 inHg on it.

[Edited on 23-3-2017 by Liamatpm]