Sciencemadness Discussion Board

vacuum filtration

danton - 16-11-2024 at 02:17

I want the ability to perform vacuum filtration but a proper vacuum pump is too expensive right now. I can't use an aspirator on a water tap as my tap water flow rate is much too low. My next thought is a manual vacuum pump for automotive brake bleeding. Something like this:

https://tinyurl.com/3pv23ssc

Has anyone else used one and do they work or is there something i'm missing?

Advice appreciated, thanks

Precipitates - 16-11-2024 at 02:42

They work - the Explosions&Fire youtuber often uses one to vacuum filter solutions.

Only downside I can see is lots of pumping, and drying precipitates by leaving them on vacuum for 30 mins to an hour or so becomes less practical - unless you want to pump for this duration!

danton - 16-11-2024 at 03:55

Quote: Originally posted by Precipitates  

Only downside I can see is lots of pumping, and drying precipitates by leaving them on vacuum for 30 mins to an hour or so becomes less practical - unless you want to pump for this duration!


Thanks, yes good point about drying. Maybe I should try and find a reasonably priced electric automotive pump. The lab models are just too expensive.

Sulaiman - 16-11-2024 at 04:44

Have a look at the pump used by keras here
https://www.sciencemadness.org/whisper/viewthread.php?tid=16...
More than adequate.

(I use even cheaper pumps,
so far....-65kPa is ok, -80kPa is good, -100kPa is bad as it will boil water)

danton - 16-11-2024 at 12:19

Quote: Originally posted by Sulaiman  
Have a look at the pump used by keras here
https://www.sciencemadness.org/whisper/viewthread.php?tid=16...
More than adequate.

(I use even cheaper pumps,
so far....-65kPa is ok, -80kPa is good, -100kPa is bad as it will boil water)


Thanks, I've found a similar pump online. Brilliant.

Sulaiman - 17-11-2024 at 10:12

I like to put a hose from the outlet of the vacuum pump to somewhere far from me,
this minimises vapours and noise getting to me.