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Author: Subject: Suggestions of getting a lab heating source
vibbzlab
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smile.gif posted on 25-11-2019 at 17:41
Suggestions of getting a lab heating source


I am really into my lab nowadays So I need a heating source,I was thinking of a butane heater so I checked around the markets in my place in India and couldnt find any. I looked inany YouTube videos and found this kind of thing in many people. I was wondering if I should use this or something else should be used like electric or something else.
If you have suggestions please respond.
It would be also very helpful for me if you can provide me with links of those things I can get to India economically and quality wise good too.

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[*] posted on 25-11-2019 at 18:15


I suppose it's kind of like a modern take on a Bunsen burner.

How are you with wires and electronics, kind of thing? You might be able to cobble something quite quite usable and safe from some simple circuitry and some NiChrome heating elements etc.
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[*] posted on 25-11-2019 at 18:18


I am not into electric stuff




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Sulaiman
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[*] posted on 25-11-2019 at 19:02


There are made-in-India heating mantles
https://www.ebay.co.uk/itm/Heating-Mantle-500mL-220V-or-110v...
https://www.ebay.co.uk/itm/Heating-Mantle-For-Flask-220-V-Ca...
this would enable you to do distillation, refluxing etc.

Also made-in-India hotplate-stirrers
https://www.ebay.co.uk/itm/Magnetic-Stirrer-With-Hot-Plate/1...

For test tube scale I now use IKEA Glimmer tealight candles as a heat source ,
equivalent to about 30 Watts of heating ... any candle with a clean burning flame is ok.

Very nice YouTube channel ... congratulations !

P.S. that butane gas burner that you pointed to seems to be about 580 W for 40 minutes.

[Edited on 26-11-2019 by Sulaiman]




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[*] posted on 25-11-2019 at 19:10


Noisy but good.

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vibbzlab
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[*] posted on 25-11-2019 at 20:39


Thank you sulaiman
Also I am not sure if I should use a burner or electric one





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[*] posted on 25-11-2019 at 20:41


One of the best purchases I ever made was for a used Corning hotplate/stirrer on eBay. Yeah, it was a hundred bucks, but in hindsight should have been one of the first things i saved up for and bought



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[*] posted on 26-11-2019 at 03:18


Candles for test tube size stuff and anything bigger you should get a heating mantle/stirrer.unless your doing high temperature stuff (250'c +) just buy a blue/white cheap mantle off of eBay or Amazon
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[*] posted on 26-11-2019 at 03:22


Quote: Originally posted by vibbzlab  
Thank you sulaiman
Also I am not sure if I should use a burner or electric one


IMHO best to avoid the open flame.
My preference is always hotplate with stirrer, but that suits my chemistry.
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[*] posted on 26-11-2019 at 03:50


It is virtually impossible to do all the chemistry you will want to without being able to heat and stir at the same time. The combination hotplate/stirrer is the single most important piece of lab equipment.

After that, an old deep fat fryer hacked to a C-REX-100 will give you an oil bath with heating capabilities of 0-400c degrees for the price of about €40...... Only a dememted lunatic heats flammable liquids with a naked flame but this is mad science so knock yerself out.


/CJ




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[*] posted on 26-11-2019 at 04:52


I agree that heating anything more than a few ml of liquids other than water
(i.e. common/flammable solvents) with an open flame, is inviting trouble,
I also agree that continuous stirring is very important.

Although I've not tried a deep fat frier, it seems very useful and practical,
(I use oil in a cooking pot on a hotplate, but I don't know what oil would work to 400oC)

I use simple/cheap TRIAC based 'dimmer' eBay modules for controling the heating power of my cheap twin hotplate,(1500W and 750W)
and a (380W) diy heating mantle.
(even though I have a REX-C100 controller with various thermocouples and a functionally similar Eurotherm temperature controller).

P.S. it was recently pointed out to me the danger of an oil or sand bath used to heat volatile liquids;
The bath needs to be at a higher temperature than the liquid being boiled due to the thermal resistance of glass,
if the boiling flask does break then boiling liquid will drop into the bath which is at an even higher temperature,
causing rapid violent boiling ... not good to say the least.
Plan ahead for such an occurence.

[Edited on 26-11-2019 by Sulaiman]




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[*] posted on 26-11-2019 at 05:21


Ok I guess I should get a heating mantle or hotplate stirrer. Can I heat round bottom flask on flat magnetic hotplate?




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[*] posted on 26-11-2019 at 06:14


Yes, using an oil bath to transfer the heat. This helps to even out the temperature, and allows a variety of flask sizes and shapes. You can also use solid bbs, sand, water (for heating low bp organics) or other media, but oil is very common, cheap and easy. I use one often, along with soft heating mantles, which are good for refluxing reactions or larger scales.
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[*] posted on 26-11-2019 at 06:17


Quote: Originally posted by vibbzlab  
Ok I guess I should get a heating mantle or hotplate stirrer. Can I heat round bottom flask on flat magnetic hotplate?


sure you can. water bath for low boiling solvents or to heat the flask to <100°C, an oil bath can go to 200°C or a bit more before starting to smoke, if you need higher temperatures use a sand or liquid metal bath, but depends on the maximum temperature achievable by the hotplate.

you can't really control the heat input from an open flame, use them only for high temperature experiments





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[*] posted on 26-11-2019 at 06:22


Looks like I will get a hotplate with stirrer then .
I have looked around and found one in AliExpress

https://s.click.aliexpress.com/e/ojceeY3O





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[*] posted on 26-11-2019 at 07:36


Its a matter of opinion but I think that 200W is only good for warming,
for a hotplate I'd want significantly more heating power.




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[*] posted on 26-11-2019 at 07:47


Don't some people use heat lamps? I forget the pros behind doing this
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[*] posted on 26-11-2019 at 08:08


So what power should I opt for




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[*] posted on 26-11-2019 at 08:38


Quote: Originally posted by vibbzlab  
So what power should I opt for


I bought a used UK-manufactured (early-mid 80s,I'd guess) STUART brand hotplate /mag stirrer for about 40 EUR from an industrial surplus place I found on the 'bay which I'm really pleased with. Aluminium hotplate.

IIRC, it's around 480W (240V) and produces temps at the plate of up to around 230C, if that gives you an idea.

In India, don't you maybe have some guys around who are good at repairing/hacking electronics who could knock you something up from old/scrap items?

I'd still say that an older, used lab quality hotplate is your best option, over the Chineseum ones around cheap these days.

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[*] posted on 26-11-2019 at 08:58


Yes cannot believe Chinese things. That's true




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[*] posted on 26-11-2019 at 10:55


I recently purchased a cheap 250 W combined hot plate and stirer.
It has done about 100 h of use so far and no complaints.
I haven't required temps over 140 C, but it has got liquids into this range no problem at about 2/3 power, I am only talking small volumes though <200 mls.
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[*] posted on 26-11-2019 at 18:32


Quote: Originally posted by Yttrium2  
Don't some people use heat lamps? I forget the pros behind doing this


The cons outweigh any pro's.
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[*] posted on 26-11-2019 at 18:36


What size glassware do you have?
500ml - 1 litre is what most of us have and the cheap Chinese heating mantles at 400w allow most of our needs to be met.
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[*] posted on 26-11-2019 at 21:41


Yea I use max 1L




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[*] posted on 27-11-2019 at 05:57


I use an old pump-up style Coleman model 502 gasoline-fired
camp stove.




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