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Author: Subject: cheap eBay distillation kit surprise
Sulaiman
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[*] posted on 29-6-2016 at 07:20
cheap eBay distillation kit surprise


I ordered one of the cheap 24/40 500ml distilation kits fom China via eBay
http://www.ebay.co.uk/itm/351749512267?_trksid=p2060353.m274...
it arrived yesterday
... seems good quality, no bubbles, smooth glass with fairly consistent thickness and good fitting joints ...
very nice.


only one detail wrong ... 24/28 size ... yes, 28, not 29, and certainly not 40 !

I do not really care if the joints are 24/40 or 24/29 or even 24/28, all will work, just thought I'd share the 24/28 photo as I've never come across 24/28 before.



DistKit_24_28.jpg - 281kB

[Edited on 30-6-2016 by Sulaiman]
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The Volatile Chemist
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[*] posted on 29-6-2016 at 10:29


Now that is strange. And they're Bomex too...



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aga
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[*] posted on 29-6-2016 at 11:21


The cheap chinese glass has all worked fine for me so far.

Last week the first ever vacuum distillation was attempted, and the entire chinese-made disty rig withstood the heat & vacuum without even a single *tink*.




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Sulaiman
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[*] posted on 29-6-2016 at 14:00
A riddle


Why is it that in my new kit, and many that I have seen advertised,
a 105 degree still head adapter + a 75 degree receiver adapter is much less than 180 degrees ?

I think I may prefer distillate dribbling down the flask rather than dripping into it ... tbd
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aga
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[*] posted on 29-6-2016 at 14:03


Tip it all sideways a bit ?

Cheap stuff is what it is, improvise or spend more.

Edit:

Please reduce that image size to what it was Earlier (i.e. smaller) as super-sized images is becoming a Hallmark.

[Edited on 29-6-2016 by aga]




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Sulaiman
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[*] posted on 29-6-2016 at 14:09


no, I meant that the kit I have assembles with the receiving flask at an angle to the vertical,
http://i.ebayimg.com/00/s/NDI1WDU2MQ==/z/S6sAAOSwfcVUBcvj/$_...
so the distillate will dribble down the side of the flask rather than drip into the middle,
I think it may be better = more gentle.
The glassware appears to be very good quality/value, better than I expected.

EDIT: The photo is from a different seller, just to show the angle.

I do not know why the photo' is so large, I inserted it just like all previous images - how do I reduce the size ?

[Edited on 30-6-2016 by Sulaiman]
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[*] posted on 29-6-2016 at 14:21


Fail



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[*] posted on 7-7-2016 at 11:09


Be careful with the brandless Chinese stuff. Got a reaction flask with quite a few air pockets, some nearly 2mm wide (the one in the photo wasn't the biggest either, just the easiest to photo). I wouldn't heat that to 400℃, particularly under vacuum. It may not have resulted in fractures during a reflux, but do you want to find out how much air can expand while you have hot acid refluxing?
Thankfully eBay's generous buyer protection covered it and don't have to ship it back.

IMAG0684_1.jpg - 247kB
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[*] posted on 7-7-2016 at 11:25


Quote: Originally posted by aga  
The cheap chinese glass has all worked fine for me so far.

Last week the first ever vacuum distillation was attempted, and the entire chinese-made disty rig withstood the heat & vacuum without even a single *tink*.

Can i ask what pressure you took it down too? I have been dithering about using my cheapo Chinese glass for vac distillation, reassuring to hear it holds up ok.

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[*] posted on 7-7-2016 at 11:37


The gaugue read around 100mBar, which is about 75 torr.



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[*] posted on 7-7-2016 at 12:47


Yeah, just got one myself a few weeks ago. $25 for a 500 mL to 250 mL setup, with keck clamps, hose, thermometer, and even two pads of pH paper. I had to buy a vigreux column separately, but it was only like $12. Then I just got a 1000 mL two-neck flask for like $20, which gives me three flasks (one of which has two necks), and a vacuum distillation setup with thermometer for under $60.
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[*] posted on 7-7-2016 at 13:22


Quote: Originally posted by aga  
The gaugue read around 100mBar, which is about 75 torr.

Thanks, sounds like the price dosnt reflect the quality in this case!

I have a bit more faith in giving it a go now.
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[*] posted on 7-7-2016 at 13:31


Quote:
I have a bit more faith in giving it a go now.

As always, safety first, so take enough precautions so that you can survive intact if the entire thing implodes then explodes, spraying you with razor sharp glass shards.

Unlikely to happen, but always be prepared.

Personally i slowly (~40 secs) cranked it down to 100mBar with the entire rig in the fume hood with the 'hood door closed, listening for any *plink* noises.




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[*] posted on 7-7-2016 at 13:47


No fume hood yet, but a screen would seem in order until i can one built! Doubt i would hear a plink from 300m lol.

I had planned on double glazed window panes for the front (have some from a skip), but i am now thinking the polly carbonate stuff at least for the outside pane.
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[*] posted on 7-7-2016 at 14:06


I think most of us buy cheap items on eBay.
I wouldn't have a lab without the savings it provides.

Point being, know you glassware and project.
I still use an old scuffed 2L Ace RB, but won't be heating phosphoric acid in it anytime soon.

Mistakes with chemicals can change lives. And sadly, they're often preventable. Even having a fume hood isn't enough if you don't know enough about it.

Not trying to frighten you, I hope you distill the hell out of whatever you want, just proper warning from an ass who learned a few things the hard way.
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[*] posted on 7-7-2016 at 14:12


I am blessed with the cowards gene, plus i am not generally a risk taker. But its a fair pont that for many ebay and cheap glass it what makes the hobby accessible.

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