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Registered Member #4266
Joined: Fri Dec 16 2011, 03:15AM
Location:
Posts: 874
Hi all I'm in the process of design a still to purify acetone, so far it will be able to handle 100L. I plan on raising the temperature to 60C, looking up specific heat etc with 25% acetone the rest water, I get 22080Kj, or about 15kwh(Is this correct)? On the nichrome wire wiki page it says at 204C about 1amp, shrink down I'm looking at 0.5amps +- 0.25amp.
To build this thing would have it wired to 240volt or should I use mutliable 12v/12amp transformers.
Registered Member #2939
Joined: Fri Jun 25 2010, 04:25AM
Location:
Posts: 615
If it were me I'd simply buy a ready made immersion heater, such as a jug heater. Already sealed and electrically insulated, with nice convenient connections, pre-defined power output, cheap, easily replaced. That's what I used on my alcohol still. If you are doing power and /or temperature control make sure you use a solid-state controller- no sparky contacts!
Regarding the nichrome wiki :
Applying only to straight wires stretched horizontally in free air.
This is a very important point, as you want to heat 100l of acetone/water - not air. Also you can not expect the current vs temp to be even remotely linear.
Registered Member #396
Joined: Wed Apr 19 2006, 12:55AM
Location: Pittsburgh, PA
Posts: 176
I have one of these immersion heaters and it is excellent. You may want to look for something similar (Vycor/quartz). Good for high purity applications and easy to clean.
Registered Member #193
Joined: Fri Feb 17 2006, 07:04AM
Location: sheffield
Posts: 1022
If you were in the business of designing stills, you wouldn't be asking here. If you are not in that field and you build one, you may struggle to get insurance for using it. Buy (or rent) a proper still.
Incidentally, the heat needed to get the solvent to 60C isn't the only criterion. You need data on heats of evaporation etc.
Registered Member #4266
Joined: Fri Dec 16 2011, 03:15AM
Location:
Posts: 874
Hi Bored Chemist
I do have engineering qualification, but I'm still getting someone to construct it, and design some specs. Thanks for the tip about insurance, I will ask when I apply.
Registered Member #4266
Joined: Fri Dec 16 2011, 03:15AM
Location:
Posts: 874
Just wondering what a stove top element ohms are, if I was going to use this to heat oil bath, with the water container in the oil how: Is the resistance of nickel-chrome based on the wire and the series resistors, or just the series resistors.
Thanks
If you were in the business of designing stills, you wouldn't be asking here. If you are not in that field and you build one, you may struggle to get insurance for using it. Buy (or rent) a proper still.
It can only handle 4 litres and cost $300, I'm type of after 40Litres per 3 hours, and they would proable cost grands$
Edit I've got these values for 40litres, if accurate SFC 4.19kj/kg/k T 110C L 40
Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
Hot water tank with immersion heater?
I'm not sure what safety measures would be required though, so don't take my word for it without doing your homework, but you should be able to use standard copper plumbing fittings, etc.
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Nichrome wire heater
