DFliyerz
Hazard to Others
Posts: 241
Registered: 22-12-2014
Member Is Offline
Mood: No Mood
|
|
Hot Plate Overnight
I'm planning to use an electrolysis cell to make potassium chlorate from potassium chloride, but due to the location of my lab (my garage), it will
get very cold at night, even with 5 amps of power. Would it be safe to leave my hot plate on overnight, at warm or low settings?
|
|
|
macckone
International Hazard
Posts: 2159
Registered: 1-3-2013
Location: Over a mile high
Member Is Offline
Mood: Electrical
|
|
It really depends on the quality of the hotplate.
Good ones can run continuously for years.
Ps. A cheap space heater may be preferable if the hotplate is questionable.
[Edited on 30-12-2014 by macckone]
|
|
|
DFliyerz
Hazard to Others
Posts: 241
Registered: 22-12-2014
Member Is Offline
Mood: No Mood
|
|
The hotplate is an Aroma single burner, which so far has proven to be pretty good quality.
|
|
|
gdflp
Super Moderator
Posts: 1320
Registered: 14-2-2014
Location: NY, USA
Member Is Offline
Mood: Staring at code
|
|
The problem wouldn't be the normal function of the hot plate, theoretically it should be fine. However, hot plates sometimes fail and spontaneously
burst into flames, even at low temperatures. It even occurs when the hot plates are off, but still plugged in, though I would assume this is
reasonably rare. Generally potassium chlorate cells get very hot, so the cell should keep itself warm overnight.
|
|
|
violet sin
International Hazard
Posts: 1475
Registered: 2-9-2012
Location: Daydreaming of uraninite...
Member Is Offline
Mood: Good
|
|
how about a small 3$ styrofoam cooler around the vessel itself. you can get them at many grocery stores, they only hold enough food for a picnic or
so. this doesn't actually address the hotplate issue, but it may help with the overall temp at night.
|
|
|
forgottenpassword
Hazard to Others
Posts: 374
Registered: 12-12-2013
Member Is Offline
Mood: No Mood
|
|
Thousands of hotplates in thousands of laboratories are left on overnight on a daily basis.
|
|
|
Fulmen
International Hazard
Posts: 1693
Registered: 24-9-2005
Member Is Offline
Mood: Bored
|
|
A quality hotplate should withstand a few years of continuous service, we used a common "dorm-type" single burner and it ran on full power IIRC
24/7/365. But that was on a manned lab, unsupervised you should strive for as few powered devices as possible. Anything like a hot plate should be
avoided if possible, and in your case the power output should be more than enough with some insulation. I'm currently running a 500ml cell at 4A/3,2V
and it produces more than enough heat for this to work.
|
|
|
g1ng3rbr34d_m4n
Harmless
Posts: 6
Registered: 4-1-2015
Member Is Offline
Mood: No Mood
|
|
You could stick a heating pad under your cell...
|
|
|
unionised
International Hazard
Posts: 5102
Registered: 1-11-2003
Location: UK
Member Is Offline
Mood: No Mood
|
|
It's not really my field.
Does it matter if the cell gets cold?
|
|
|
Mailinmypocket
International Hazard
Posts: 1351
Registered: 12-5-2011
Member Is Offline
Mood: No Mood
|
|
If there is sufficient current running through the cell it should not need external heating. Sometimes I have had to put the cell in a bowl of cool
water to allow better heat dissipation because it was getting too hot to touch.
[Edited on 5-1-2015 by Mailinmypocket]
|
|
|
Bert
Super Administrator
Posts: 2821
Registered: 12-3-2004
Member Is Offline
Mood: " I think we are all going to die. I think that love is an illusion. We are flawed, my darling".
|
|
There is a thing called "insulation".
Rapopart’s Rules for critical commentary:
1. Attempt to re-express your target’s position so clearly, vividly and fairly that your target says: “Thanks, I wish I’d thought of putting it
that way.”
2. List any points of agreement (especially if they are not matters of general or widespread agreement).
3. Mention anything you have learned from your target.
4. Only then are you permitted to say so much as a word of rebuttal or criticism.
Anatol Rapoport was a Russian-born American mathematical psychologist (1911-2007).
|
|
|
phlogiston
International Hazard
Posts: 1375
Registered: 26-4-2008
Location: Neon Thorium Erbium Lanthanum Neodymium Sulphur
Member Is Offline
Mood: pyrophoric
|
|
1. increase the distance between the electrodes
2. increase the voltage to restore the current to its previous level
This way you can increase the ohmic heating to any desired level
Normally, this is avoided as it is detrimental to efficiency (you are spending electric power on heating rather then electrolysis).
But first take Berts advice and add insulation.
-----
"If a rocket goes up, who cares where it comes down, that's not my concern said Wernher von Braun" - Tom Lehrer |
|
|
dermolotov
Hazard to Others
Posts: 114
Registered: 13-12-2014
Location: Toronto, Canada
Member Is Offline
Mood: Free
|
|
Magic!
I do the same with my hotplate/stirrer (Corning PC 420) for overnight oxidation sometimes. Since it is outside, I put the heating on 1 or 2 in the
winter and place it in a large belljar with the vacuum adapter open. This has prevented a sudden ignition of ether vapours before (not sure how that
happened). It had obviously set on fire as the wood underneath was burnt.
Miraculously, the hot plate was fine.
Not sure how much belljars are... But it is worth the investment if you need to stir/ heat things like ether or hexanes solutions overnight.
[Edited on 10-1-2015 by dermolotov]
|
|
|
Texium
|
Thread Moved
22-11-2023 at 19:04 |
![[*]](images/xpblue/default_icon.gif){kind=icon}
