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Author: Subject: latest glassware purchase
Herr Haber
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[*] posted on 19-10-2018 at 02:58


Quote: Originally posted by Mr. Rogers  

I guess they throw the whole unit out if the cord becomes frayed/burnt.


It's probably even sillier than that.
I know a lot of companies cut cords from the (working) computer equipment they replace just for accounting reasons. With the cord, it still has a value, without it it doesnt.
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monolithic
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[*] posted on 19-10-2018 at 03:37


Quote: Originally posted by Mr. Rogers  
Quote: Originally posted by TheIdeanator  
Scored an empty 500 ml bottle from the trash at school. I should ask my prof to save them for me....


College dumpsters are the best. I got two IKA hotplate/stirrers with cut cords and fixed them.

I guess they throw the whole unit out if the cord becomes frayed/burnt.

It's probably cheaper to order a whole new unit than just a replacement cord from IKA.
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Ubya
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[*] posted on 19-10-2018 at 03:42


Quote: Originally posted by Mr. Rogers  
Quote: Originally posted by TheIdeanator  
Scored an empty 500 ml bottle from the trash at school. I should ask my prof to save them for me....


College dumpsters are the best. I got two IKA hotplate/stirrers with cut cords and fixed them.

I guess they throw the whole unit out if the cord becomes frayed/burnt.


my chemistry department cleans its labs and offices once or twice a year, we don't have a dumpster, so a truck comes, loads averything they threw (computers, stirrers, I ONCE SAW A ROTOVAP, equipment of every kind) and brings it somewhere (i don't know where...), i wait these rare events to scavenge interesting stuff. i need to find a friend in the department that will let me take freely what i need from the truck while they load it with stuff. i hope to find a rotovap:D





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arkoma
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[*] posted on 19-10-2018 at 12:20


Quote: Originally posted by nimgoldman  
These distillation adapters so that I can attach more efficient downward-facing condenser. I need this for distilling more volatile products from reaction mixtures, like ether or bromoethane.

Other than that, a bunch of amber glass reagent bottles for more sensitive chemicals like chloroform.


Have the adapter on the right---very good pairing with my Graham condenser




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TheIdeanator
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[*] posted on 19-10-2018 at 20:02


Quote: Originally posted by Ubya  
Quote: Originally posted by Mr. Rogers  
Quote: Originally posted by TheIdeanator  
Scored an empty 500 ml bottle from the trash at school. I should ask my prof to save them for me....


College dumpsters are the best. I got two IKA hotplate/stirrers with cut cords and fixed them.

I guess they throw the whole unit out if the cord becomes frayed/burnt.


my chemistry department cleans its labs and offices once or twice a year, we don't have a dumpster, so a truck comes, loads averything they threw (computers, stirrers, I ONCE SAW A ROTOVAP, equipment of every kind) and brings it somewhere (i don't know where...), i wait these rare events to scavenge interesting stuff. i need to find a friend in the department that will let me take freely what i need from the truck while they load it with stuff. i hope to find a rotovap:D


I also pinched a bunch of test tubes, some chemicals and more recently than the bottle, a nice old variable power supply in good condition that was on its way out. Most of those were from projects I was on that I'm fairly certain no one will ever use or miss.




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Ubya
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[*] posted on 14-11-2018 at 00:51


thank you deschem, the foam sarcophagus worked:D

20181114_094654.jpg - 655kB





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monolithic
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[*] posted on 15-11-2018 at 20:06


I'm trying to piece together a good set of condensers but before I purchase them, I'd like some opinions on how well these more exotic types of condensers work.

Fractional distillation: https://www.ebay.com/itm/300mm-24-40-Distilling-Column-Disti... packed with ceramic Raschig rings
Reflux: https://www.ebay.com/itm/24-40-300mm-Glass-Davies-Condenser-...
Simple distillation: https://www.ebay.com/itm/Liebig-Condenser-24-40-400mm-Jack-l...

Would these condensers be ideal for my listed purpose, and would the Davies condenser also work well for for simple distillation? Also, is the "distilling column" packed with Raschig rings vastly superior to a Vigreux in terms of separation/resolution of fractions, or is it more of a slight improvement?

[Edited on 16-11-2018 by monolithic]
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Sulaiman
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[*] posted on 16-11-2018 at 05:10


The column looks good;
.without the glass spiral it makes a good air-condenser for high b.p. liquids
.with glass balls as packing I'd expect at least twice as many 'plates' as a similar sized Vigreaux, even more with better packing.
.I have broken two glass spirals so far during cleaning and handling and I'm not aware of a cheap source, so a little diy glass-bending may be required in future.

There is no such thing as a condenser that is too efficient for product collection,
more cooled surface area = better
BUT
A Leibig condenser is adequate for most purposes, is easy to clean and is the most robust construction,
Two Leibig condensers are cheaper than one helical/jacketed/turbulent-flow efficient condenser but give more flexibility.

If only occasional simple distillations are envisioned then one of these may be very convenient
https://www.ebay.com/itm/24-40-Distillation-head-Short-Path-...

There are many choices, generalisations and opinions, even though I do not own one,
a Vigreaux column is probably the best start,

as it will allow you to compare results with others, here and on YouTube for example,.

A still capable of fine fractionation is (I have found) a non-trivial (two years and counting) exercise.
(You may notice how few fine fractionating stills are featured in amateur chemistry videos - with good reason)
The only examples that I could find were all for specifically ethanol :P
(lots to be learned from those guys)

My most efficient condenser was from 'SM Secret Santa' and I've not needed better. It Looks like this https://www.ebay.com/itm/200mm-24-40-Coiled-Reflux-Condenser...




CAUTION : Hobby Chemist, not Professional or even Amateur
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VSEPR_VOID
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[*] posted on 16-11-2018 at 07:14


A 5 liter 3-neck 24-40 flask (a big fucking flask)



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JJay
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[*] posted on 16-11-2018 at 18:34


Quote: Originally posted by VSEPR_VOID  
A 5 liter 3-neck 24-40 flask (a big fucking flask)


I keep thinking about buying one of those, but my biggest flask so far is 3 liters.

I picked up a transfer adapter and a vacuum adapter, pictured here in the aura of their holy power (actually the photo is just overexposed). One of these days I'm going to try making phenylsodium or chromous acetate.

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JJay
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[*] posted on 28-11-2018 at 16:40


I got a 1 L Dewar condenser / cold trap.

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[*] posted on 29-11-2018 at 03:40


Quote: Originally posted by JJay  
I got a 1 L Dewar condenser / cold trap.

[/rquote

how much does something like this cost?
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[*] posted on 29-11-2018 at 06:47


I paid $77 with free shipping during a sale. That's a steal, basically; I think right now they are $96.

An equivalent Chemglass condenser would be around $270. I'm not sure that this is quite Chemglass quality, but the quality is excellent.




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[*] posted on 2-1-2019 at 19:11


Just got my christmas present! Various adapters from Dr. Bob. Expertly packed, not a single piece damaged.

So excited to put these pieces to work!

20190102_190604(1).jpg - 1MB
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Ubya
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[*] posted on 22-1-2019 at 01:49


my claisen adapter arrived. the seller probably messed up and put the wrong price on this listing, but he shipped anyway.
BUT, wrong joint size.... i ordered 24/29 and he sent me 24/40, oh well they can still be compatible even if a bit ugly

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PyroPlatinum
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[*] posted on 22-1-2019 at 14:49


My last one was a jar of jam.
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[*] posted on 11-2-2019 at 10:26


Glassware and Gassware

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