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Author: Subject: latest glassware purchase
Herr Haber
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 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.
monolithic
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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.
Ubya
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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

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arkoma
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 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

Self aware bag of organic slime..............

Collector of reagents.
TheIdeanator
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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

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.

“I will show you fear in a handful of dust.”
― T.S. Eliot
Ubya
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thank you deschem, the foam sarcophagus worked

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monolithic
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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]
Sulaiman
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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

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
(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
VSEPR_VOID
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Mood: Fullerenes

CIA Agent: A lot of loyality for a hired gun!

Bane: Or perhaps he was wondering why someone would shoot a man before throwing him out of a plane.

CIA Agent: At least you can talk. Who are you?

Bane: It doesn’t matter who we are. What matters is our plan. No one cared who I was until I put on the mask.

CIA Agent (talking about Bane’s mask): If I pull this off, will you die?

Bane: It would be extremely painful…

CIA Agent: You’re a big guy.

Bane: … for you.
JJay
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 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.

I'm no longer involved in this forum.
JJay
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I got a 1 L Dewar condenser / cold trap.

I'm no longer involved in this forum.
RogueRose
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 Quote: Originally posted by JJay I got a 1 L Dewar condenser / cold trap. [/rquote how much does something like this cost?
JJay
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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.

I'm no longer involved in this forum.
happyfooddance
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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!

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 Sciencemadness Discussion Board » Fundamentals » Reagents and Apparatus Acquisition » latest glassware purchase Select A Forum Fundamentals   » Chemistry in General   » Organic Chemistry   » Reagents and Apparatus Acquisition   » Beginnings   » Miscellaneous   » The Wiki Special topics   » Technochemistry   » Energetic Materials   » Biochemistry   » Radiochemistry   » Computational Models and Techniques   » Prepublication Non-chemistry   » Forum Matters   » Legal and Societal Issues   » Detritus   » Test Forum