Naphtha and magnetic stirrers

[wai]

We are producing dmt using light naphtha. We are thinking of purchasing a fully automatic stirrer. So, we are thinking of purchasing a stirrer with two functions: an overhead stirrer and a magnetic stirrer. However, we have seen a post saying that magnetic stirrers are not very effective when using naphtha.
What is the actual situation? We are thinking of purchasing the product in the image.

 

[drpotato]

magnetic stirrers can vary in power quite a bit. it depends if the mixing method involves forming a vortex that circulates through the entire solution, or, having just a swirl going without forming an emulsion.


one benefit of magnetic stirrers is you can stir a sealed vessel.
one downside of overhead stirrers is that if its not brushless, hovering it directly over hot fuming naptha WILL cause a fire/explosion, a proper flammable vapor safe lab mixer costs something like $300-1000.
a benefit of overhead stirrers is you can adjust the height of the mixer to more easily pull in and disperse the naptha in solution, but again thats not always how things are done, its certainly not neccesary.
it really just boils down to a matter of cost as well as safety.

If thats literally the one you are using, check that its using a brushless motor and not brushed. i have concerns since it seems to run directly off 100V mains, which is very unusual for a brushless motor

 

[61pete]

At the Amazon link it shows the OS10 has a brushless DC motor with digital control, but Id check with Onilab to make sure it can work with flammable vapours just in case there are relays or contacts inside that will arc.
The front panel on/off switch might be problematic.

 

[wai]

magnetic stirrers can vary in power quite a bit. it depends if the mixing method involves forming a vortex that circulates through the entire solution, or, having just a swirl going without forming an emulsion.


one benefit of magnetic stirrers is you can stir a sealed vessel.
one downside of overhead stirrers is that if its not brushless, hovering it directly over hot fuming naptha WILL cause a fire/explosion, a proper flammable vapor safe lab mixer costs something like $300-1000.
a benefit of overhead stirrers is you can adjust the height of the mixer to more easily pull in and disperse the naptha in solution, but again thats not always how things are done, its certainly not neccesary.
it really just boils down to a matter of cost as well as safety.

If thats literally the one you are using, check that its using a brushless motor and not brushed. i have concerns since it seems to run directly off 100V mains, which is very unusual for a brushless motor

I sincerely appreciate your response, it looks like a dc brushless motor is being used, would a dc brushless motor work?

 

[drpotato]

I sincerely appreciate your response, it looks like a dc brushless motor is being used, would a dc brushless motor work?

for the most part yes, though wai has a point too. especially if its of a very cheap construction, they may still have mechanical switches routing the main power that can ignite fumes, but i very much doubt it uses relays. personally, since i know exactly how it would be a hazard, i would stop at asking if its brushless or not, but since you dont know much about electrical/chemical hazards, i really think you should play it safe. Check that its rated for flammable vapors. Otherwise for a cheap one you may have to go with something that wont be so deep in the fumes.