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organicchemist25
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[*] posted on 16-9-2017 at 09:34
Double condenser? Please help ID and use of it


I bought this off of someone in bulk buy of glassware a few years ago. It definitely looks custom made as some of the connections are not the prettiest with tiny air bubbles, but seems totally fine for its use. I am attaching a pic. I would like to know what it might be used for. It's two condensers in one? It looks like a claisen adapter with an additional short path modified into it? BUT, the both lead to the same receiving flask. My only educated guess would be that it separates the mixture and when it enters the receiving flask is separated into layers?

Please let me know what it could be used for and a possible example. Thank you :)

IMG_4245.JPG - 3MB

[Edited on 16-9-2017 by organicchemist25]
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[*] posted on 16-9-2017 at 10:14


It looks identical to some variable reflux heads I have seen except it has no valve between the splitter and the lower condenser.

The idea is that the upright condenser establishes a reflux in the column, and some of the returning condensate goes through the lower condenser to be further cooled and collected.
Don't know how well one works without the valve though.

It would be used for difficult fractionations where returning some of the distillate to the column would be needed to help maintain equilibrium.





[Edited on 16-9-2017 by SWIM]
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organicchemist25
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[*] posted on 16-9-2017 at 11:19
Double condenser? Custom made. Please help with use.


I bought this off of someone in bulk buy of glassware a few years ago. It definitely looks custom made as some of the connections are not the prettiest with tiny air bubbles, but seems totally fine for its use. I am attaching a pic. I would like to know what it might be used for. It's two condensers in one? It looks like a claisen adapter with an additional short path modified into it? BUT, the both lead to the same receiving flask. My only educated guess would be that it separates the mixture and when it enters the receiving flask is separated into layers?

Please let me know what it could be used for and a possible example. Thank you :)

Oh, and, I know one looks like it could be used for refluxing? But still has an exit for vapors that get past the column?

IMG_4246.JPG - 1.8MB

[Edited on 16-9-2017 by organicchemist25]
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[*] posted on 16-9-2017 at 12:03


It's STILL a partial take off distillation head.

And it would still be better if there were a valve just above the lower condenser.
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organicchemist25
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[*] posted on 16-9-2017 at 12:09


Ahhh, ok. Thank you
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[*] posted on 16-9-2017 at 18:29


I'm sorry I had posted this twice. I had checked back a few minutes after first time posting and didn't see it in the current posts. I didn't realize the first had been moved. I thought it didn't post, so I reposted later a second time. I now know to post these types of questions in the mystery glassware. :) thanks.
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[*] posted on 12-10-2017 at 02:03
Identify this glassware please


Hi

I'm hoping somebody can help me identify these 2 pieces of glassware, I've bought a job lot of used laboratory glassware and I can't find these anywhere.

Thanks in advance

Mike

DSC_0002.jpg - 96kB DSC_0003.jpg - 91kB DSC_0004.jpg - 83kB
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[*] posted on 12-10-2017 at 11:49


You have a weighing burette and about a third of a vacuum filtration system

http://www.multilab.biz/laboratory-glasswares/bottles/b15-lu...

http://www.medicalexpo.com/prod/merck-millipore/product-7087...

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[*] posted on 12-10-2017 at 14:09


Hi unionised

Thanks for the information

Mike
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[*] posted on 1-11-2017 at 04:37
Any ideas?


Hi guys, I'm fairly new here but saw this thread and had to post my weird items of glass. I especially love the sphere inside a sphere inside a sphere....the coloured stuff in them is just food colouring and water. thanks for any help identifying any of these.

IMG_20170923_192921.jpg - 2.4MBIMG_20170923_192925.jpg - 2.6MBIMG_20170923_192940.jpg - 2.7MB
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[*] posted on 1-11-2017 at 04:59


It looks like you have broken pieces of a vapour diffusion pump.
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[*] posted on 16-11-2017 at 00:26


This is just a straight 50cm tube with a 24/29 ground glass joint on the bottom. I was thinking it is maybe an air cooled reflux condenser? Maybe it is something more specific? Can anyone tell exactly what it’s use is?

ABBF53F9-A7B2-4FA1-A6B6-E0A22C05CE74.jpeg - 2.2MB




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[*] posted on 16-11-2017 at 06:04


If it's fused quartz, it could be used for something like reaction involving catalysts where you put your metal catalyst in the middle of the tube, pass your gas through it, and then heat it up. May be a good peice for making nitric acid from ammonia. Pretty useful peice of glassware if you want to get into catalysis. Not 100% sure what the ground glass joints are there for, I guess it is to make it more versatile.

Edit: the YouTube channel "Astral Chemistry" uses tubes like this a lot of times for catalytic reactions.

[Edited on 16-11-2017 by TheNerdyFarmer]
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[*] posted on 16-11-2017 at 06:39


It's probably for multiple uses, I wouldn't pin it down to just one for the following reasons:
a) Condensers with ground glass joints usually have one at both ends so they can be used for distillations and reflux, otherwise they are designed for 'bung and tubing' setups and would just be a glass tube - it's rare to have a mixture of QuickFit and older connecting styles unless you're dealing with very specialised and custom made pieces in a complex arrangement, which this probably isn't since D/R are basic lab procedures.
b) Reflux, in most cases, requires an actively cooled condenser so that the vapour isn't pushed out of the top and lost. I can imagine this being used with less volatile solvents than say ethanol or acetone, but there isn't much point when you can get a better condenser with a wide range of solvent compatibility, that is more effective at a shorter length (150-300mm) thus reduces the risk of accidentally breaking the glassware.
c) If using this purely for catalysis, it would require a bung and a glass tube to introduce gas since the diameter is around 20mm, quite large for a laboratory hose. It would be far easier and safer to have a barbed gas port on the end or a ground joint for gases which may cause the bung to perish.

Just my thoughts, doesn't mean it can't be used for the proposed applications but it certainly isn't limited to just one. The great thing about glassware is that you can use many pieces for a wide variety of procedures, especially simple pieces like this, there is no right or wrong way to assemble an apparatus just as long as it does what you want.
Edit: two other applications are as a simple fractionating or chromatography column. Glass or cotton wool can be used to pack the end, and then it can be filled with whatever you want. For the latter, you can get QuickFit stopcocks with a female joint, increasing the versatility compared to a single unit.

[Edited on 16-11-2017 by LearnedAmateur]




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[*] posted on 8-12-2017 at 09:11


https://m.ebay.com/itm/Lot-of-6-Kimax-Kimble-Flask-Glass-500...:ozkAAOSwAVxZvc6R

I do not own these, I just found them on eBay and was curious. What is the silver looking mirror made of and why is it there. Does it block out light? Is it made out of an inert metal such as platinum? I look forward to seeing what you guys come up with. Thanks!
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[*] posted on 8-12-2017 at 10:52


Anybody know what this is..........?


/CJ

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[*] posted on 8-12-2017 at 18:22


Is that a hole in the bottom bulb? Seeing the scale on the long tube my first thought is that this some kind of manometer or gas volume measuring device.
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[*] posted on 8-12-2017 at 18:26


I think that's an automatic buret, or at least the filling tube part.
I have something similar I got in a bulk lot of used glassware.




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[*] posted on 8-12-2017 at 18:40


Apologies for the short and blunt question.......... And my picture being kinda upside-down

When this contraption is screwed in place with its white plastic seal (to whatever??), the 'bottom' bulb actually is actually at the top of the system. And yes, there is a pin hole on the bulb.
It seems liquid can move up the inner long tube and into the outside tube the smaller one is encased in.
And can then drain out the small arm

Graduations on the outside tube are in tenths of millilitres and the total scale covers a range of 20ml.
At the base of the scale are the letters 'MBL'....... What is this.........?

The selected piece was in a random lot of glass that was saved from the dumpster at a local factory.

Everything else was quite useful........ And this doesn't even fit anything.........


/CJ

[EDIT] - Howdy SWIM. You posted while I was writing.

[Edited on 9-12-2017 by Corrosive Joeseph]




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[*] posted on 9-12-2017 at 14:32


MBL is a brand. Possibly from May and Baker Ltd.
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[*] posted on 9-12-2017 at 16:49


Automatic burette gets my vote too

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[*] posted on 9-12-2017 at 17:11


Thanks guys....... Nailed it


/CJ




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[*] posted on 15-12-2017 at 16:00


Two recent exhibits. I'll post them separately.
I found them both while unpacking boxes into my lab -- originated from a garage sale lot I picked up a while back.

Exhibit A
Looks like a ground glass erlenmeyer but the top looks like it has a built-in funnel. The stopper looks like it is designed to vent something. But there is no hose barb. Close inspection of the stopper shows a notch so that it does not seal fully.
It looks like it has been designed for some specific purpose but that purpose eludes me. My bes guess is some kind of pressure-equilising addition system where you fill the funnel with some liquid which drips into the flask and reacts producing a gas. The dripping creases when the presure gets too high.
Ok. I might have answered my own question here. But Does anyone want to guess a specific usage? I think it is a clever idea but I can't think of it actually being that useful for most of what I do.

The whole question is a bit moot anyway -- I managed to break the stopper while cleaning it.

2017-12-15 17.14.27.jpg - 271kB2017-12-15 17.15.52.jpg - 311kB
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[*] posted on 15-12-2017 at 16:04


Exhibit B

No ground glass -- I guess it is designed for rubber stoppers. I guess you could add a straight tube and you would have a liebig. But is that the intent? Every application I have thought of comes just shy of being properly useful.

2017-12-15 17.13.59.jpg - 266kB
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[*] posted on 15-12-2017 at 16:27


Simple air condenser? Idk with the barbs
Maybe a gas drying tube?
[Edited on 16-12-2017 by Chemvironment]

[Edited on 16-12-2017 by Chemvironment]
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