Home Laboratory: DIY Hot Plate Stirrer

[41Dxflatline]

Here's the garbage I was talking about the other day. Vevor sells a variation of these

 

[workworkwork]

My Vevor magnetic stirrer 5L 500w, stopped working in the first day of use. I did a bath sand to heat water as a test and it stopped working in minutes. I searched in google what the problem could be and found is always necessary it have a liquid to work as a heatsink for the hotplate, so i cannot make bath sands.
Because the hotplate was broken, I opened it and found it worked if I disconnect the internal temperature probe screwed in the ceramic hotplate. Now I have it working again! Without temperature control from the hotplate but it has an external temperature probe.

 

[SkylineSalesCannaboids]

My vevor heating went out after 5 uses

 

[HerrHaber]

built several stirrers from PC fans and the only problem is that they start on high speed and it can't be lowered to optimal rpm

 

[ruen]

Buy a pwm duty cycle regulator (just google that), or make it urself if you got basic soldering skills using a transistor (depending on ur motor used), 555 timer, potentiometer and some diodes

 

[cake]

Building a DIY hot/cold bath with stirring this weekend...

Posting here so I remember to reply with results.

 

[HerrHaber]

Do you intend to use peltier cooling/heating? It’s funny that you can put ultrasound to it as well as magnetic stirring and an extra resistor for efficient heating. If you use aluminum or no magnetic vessel (for the stirrer).

 

[cake]

Thermolysis recirculating chiller/heater + 12qt bucket + 2 ball valves = cold/hot bath ¯\_(ツ)_/¯

I'm using an overhead stirrer.

Make sure you have plenty of necks on your flask and some claisens around because you'll think of shit you want to add later.

I'll post a thread next Monday called "The DIY $1,000 5L Reactor" documenting my build.

 

[cake]

If I didn't need my reaction to be -30C I could have gotten a $150 heater instead of a $800 chiller and it would've been much cheaper.

 

[HerrHaber]

I had something much smaller in mind when I first thought of this... not minute but capable of parallel synthesis like for development/optimization. You meant prep batch not to say pilot to a 5L scale batch reactor. I think this scale most productive for many of my past and future preparations, only when the method is self validated and largely optimized.

 

[Osmosis Vanderwaal]

I modified one. Made a post about it. It was NOT UL approved. No, not at all

 

[ruen]

The issue is the hotplates made for cooking are often magnetic, which interferes with the stirrer. Another problem is the stirring fan is plastic and not suited for such high temperatures.
My idea was getting a alumunium plate and heat it using a nichrome wire, thats glued to the plate using some thermal glue, while maling sure it does not to fry the fan.
I did not have the time to finish this yet tho. Maybe someone has some tips?