Vosoryx
Hazard to Others
Posts: 282
Registered: 18-6-2017
Location: British Columbia, Canada
Member Is Offline
Mood: Serial Apple Enjoyer
|
|
Vacuum cleaner(s) as a vacuum pump?
I am trying to win the hotplate stirrer from http://www.sciencemadness.org/talk/viewthread.php?tid=74020
as I have been for some months now. Each attempt gets me closer, but not quite there. After referring with someone who teaches chem, I'm pretty sure
that at this point in order to proceed I need a vacuum pump. However, cost becomes pretty prohibitive for a good one.
I would use an aspirator which is within my price range, but ammonia is a pretty major by product and I don't think my pump would like being in
extremely basic water for two hours.
An idea of mine came up: I could a vacuum cleaner, as all it really needs to do is suck the ammonia out in a reasonable time, and maybe lower the BP
by a few degrees.
My concern is this: vacuum cleaners cool down their motors with passing air over them. If I were using it as a vacuum pump, there would not really be
any passing air, so it would overheat rather soon. If I used multiple, would I give the motors enough time to cool down? How many would I need?
Is this idea economical at all, or is it just as stupid and pointless as most of my ideas? let me know if I'm just unnecessarily complicating this and
the obvious idea is just staring me in the face- that's happened before.
~Vos
|
|
|
VSEPR_VOID
National Hazard
Posts: 719
Registered: 1-9-2017
Member Is Offline
Mood: Fullerenes
|
|
I wouldn't count on the vacuum cleaner holding up to the fumes and moisture. You could just keep the solution your original pump in slightly acidic.
Have you considered using cold vinegar or maybe even some sort of buffer?
Within cells interlinked
Within cells interlinked
Within cells interlinked
|
|
|
Vosoryx
Hazard to Others
Posts: 282
Registered: 18-6-2017
Location: British Columbia, Canada
Member Is Offline
Mood: Serial Apple Enjoyer
|
|
I wanted to avoid adding acid because I didn't want to overshoot and put my pump through acidic conditions, but putting in a buffer acid would
probably work quite well. Thanks.
|
|
|
XeonTheMGPony
International Hazard
Posts: 1636
Registered: 5-1-2016
Member Is Offline
Mood: No Mood
|
|
it will die fast and with lots of smoke.
they are series wound brushed motor, they run hot, they use the air flow over them to cool, that is why it is bad to not change the bags in the
cleaner for too long.
In your idea there will be no air flowing over the motor.
the heat will blow it long befor any acid vapors or moisture will!. But you're aware of this and no there is no viable work around and the vacuum
generated will be use less bin the idea!
A water asperiator will not care about ph of the water, run it open loop and water the yard! the plants will love the ammonia spread out and diluted.
they aren't hard to make if space is a concern.
[Edited on 30-9-2017 by XeonTheMGPony]
|
|
|
unionised
International Hazard
Posts: 5104
Registered: 1-11-2003
Location: UK
Member Is Offline
Mood: No Mood
|
|
"vacuum" cleaners hardly generate a vacuum at all.
Typically a fan will "stall" once the pressure difference across it is a few inches of water.
|
|
|
vmelkon
National Hazard
Posts: 669
Registered: 25-11-2011
Location: Canada
Member Is Offline
Mood: autoerotic asphyxiation
|
|
Yes, a vacuum cleaner generates a weak vacuum.
1. There are other methods like have a steel can. Fill with water a bit and boil and close the top. Let it cool.
2. A method I used to make a lightbulb ----> Put NaHCO3 in your glassware. Use a hand pump to remove as much as the air as possible. These hand
pump cost 50 to 60$. Heat the glassware to 150 to 200 C. The NaHCO3 decomposes to Na2CO3 + CO2 + H2O.
Use the hand pump again to remove the hot gases as much as possible. As it cools, pressure drops even more. Then wait for 1 day, the H2O has is
absorbed by the Na2CO3 and YOU END UP WITH A STRONG VACUUM.
[Edited on 6-10-2017 by vmelkon]
Signature ==== Is this my youtube page? https://www.youtube.com/watch?v=tA5PYtul5aU
We must attach the electrodes of knowledge to the nipples of ignorance and give a few good jolts.
Yes my evolutionary friends. We are all homos here. |
|
|
![[*]](images/xpblue/default_icon.gif){kind=icon}
