| Pages:
1
..
10
11
12
13
14
..
20 |
Herr Haber
International Hazard
Posts: 1236
Registered: 29-1-2016
Member Is Offline
Mood: No Mood
|
|
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
Hazard to Others
Posts: 436
Registered: 5-3-2018
Member Is Offline
Mood: No Mood
|
|
Quote: Originally posted by Mr. Rogers  |
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
International Hazard
Posts: 1247
Registered: 23-11-2017
Location: Rome-Italy
Member Is Offline
Mood: I'm a maddo scientisto!!!
|
|
| Quote: Originally posted by Mr. Rogers |
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
---------------------------------------------------------------------
feel free to correct my grammar, or any mistakes i make
---------------------------------------------------------------------
|
|
|
arkoma
Redneck Overlord
Posts: 1763
Registered: 3-2-2014
Location: On a Big Blue Marble hurtling through space
Member Is Offline
Mood: украї́нська
|
|
| 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
"We believe the knowledge and cultural heritage of mankind should be accessible to all people around the world, regardless of their wealth, social
status, nationality, citizenship, etc" z-lib
|
|
|
TheIdeanator
Harmless
Posts: 29
Registered: 8-11-2015
Member Is Offline
Mood: No Mood
|
|
| Quote: Originally posted by Ubya | | Quote: Originally posted by Mr. Rogers |
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
International Hazard
Posts: 1247
Registered: 23-11-2017
Location: Rome-Italy
Member Is Offline
Mood: I'm a maddo scientisto!!!
|
|
thank you deschem, the foam sarcophagus worked
---------------------------------------------------------------------
feel free to correct my grammar, or any mistakes i make
---------------------------------------------------------------------
|
|
|
monolithic
Hazard to Others
Posts: 436
Registered: 5-3-2018
Member Is Offline
Mood: No Mood
|
|
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
International Hazard
Posts: 3723
Registered: 8-2-2015
Location: 3rd rock from the sun
Member Is Offline
|
|
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 
(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
National Hazard
Posts: 719
Registered: 1-9-2017
Member Is Offline
Mood: Fullerenes
|
|
A 5 liter 3-neck 24-40 flask (a big fucking flask)
Within cells interlinked
Within cells interlinked
Within cells interlinked
|
|
|
JJay
International Hazard
Posts: 3440
Registered: 15-10-2015
Member Is Offline
|
|
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.
|
|
|
JJay
International Hazard
Posts: 3440
Registered: 15-10-2015
Member Is Offline
|
|
I got a 1 L Dewar condenser / cold trap.
|
|
|
RogueRose
International Hazard
Posts: 1596
Registered: 16-6-2014
Member Is Offline
|
|
|
|
|
JJay
International Hazard
Posts: 3440
Registered: 15-10-2015
Member Is Offline
|
|
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.
|
|
|
happyfooddance
National Hazard
Posts: 530
Registered: 9-11-2017
Location: Los Angeles, Ca.
Member Is Offline
Mood: No Mood
|
|
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!
|
|
|
Ubya
International Hazard
Posts: 1247
Registered: 23-11-2017
Location: Rome-Italy
Member Is Offline
Mood: I'm a maddo scientisto!!!
|
|
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
---------------------------------------------------------------------
feel free to correct my grammar, or any mistakes i make
---------------------------------------------------------------------
|
|
|
PyroPlatinum
Hazard to Self
Posts: 59
Registered: 21-2-2018
Member Is Offline
Mood: No Mood
|
|
My last one was a jar of jam.
|
|
|
itsafineday
Hazard to Self
Posts: 89
Registered: 5-1-2019
Location: "...in them thar hills."
Member Is Offline
Mood: Feelin groovy
|
|
Glassware and Gassware
|
|
|
mayko
International Hazard
Posts: 1218
Registered: 17-1-2013
Location: Carrboro, NC
Member Is Offline
Mood: anomalous (Euclid class)
|
|
A lab at work was clearing out some old stuff... I scored a box of Whatman glass-backed TLC plates!
al-khemie is not a terrorist organization
"Chemicals, chemicals... I need chemicals!" - George Hayduke
"Wubbalubba dub-dub!" - Rick Sanchez
|
|
|
arkoma
Redneck Overlord
Posts: 1763
Registered: 3-2-2014
Location: On a Big Blue Marble hurtling through space
Member Is Offline
Mood: украї́нська
|
|
A set of beakers. Can NEVER have enough beakers.
"We believe the knowledge and cultural heritage of mankind should be accessible to all people around the world, regardless of their wealth, social
status, nationality, citizenship, etc" z-lib
|
|
|
SWIM
National Hazard
Posts: 970
Registered: 3-9-2017
Member Is Offline
|
|
photochemical reactor
Picked up an Ace 250 ml photochemical reactor.
The light well is quartz, and jacketed for cooling.
32 mm wide and 350 mm deep.
The tube on the light well that looks broken is smooth and fire polished. It seems to be undamaged, but why it's just a tube on that side whereas the
other side has a nifty little Ace-thread fitting on it I have no Idea.
The Ace lamps for these things are very expensive, but I figure I can try one of those UV air duct sterilizer tubes in there or one of those water
purifier bulbs.
 
[Edited on 25-6-2019 by SWIM]
[Edited on 25-6-2019 by SWIM]
|
|
|
SWIM
National Hazard
Posts: 970
Registered: 3-9-2017
Member Is Offline
|
|
Today a falling film distillation head.
The last coil is missing from the heated 'finger' but I guess it'll do.
 
|
|
|
SWIM
National Hazard
Posts: 970
Registered: 3-9-2017
Member Is Offline
|
|
Well, they can't all be winners.
Just received a 25 plate vacuum jacketed 29/42 Bruun column.
Broken in transit!
The outer envelope was intact, but one of the internal fluid return tubes was broken, presumably by one of the bubble caps knocking against it when
the thing got jarred.
That was a damn nice column, but with all those internal moving parts shipping them is kind of a crap-shoot I suppose.
I can't even get a decent picture of the damage because its all glass and reflective surfaces in there.
|
|
|
G-Coupled
Hazard to Others
Posts: 287
Registered: 9-3-2017
Member Is Offline
Mood: Slightly triturated
|
|
I needed some small beakers etc., and saw these sets on the 'bay for 5 pounds (!).
They're Chineseum "Borosilicate 3.3", but they seem to be well made (so far) and work perfectly.
 
|
|
|
fusso
International Hazard
Posts: 1922
Registered: 23-6-2017
Location: 4 ∥ universes ahead of you
Member Is Offline
|
|
Whats that for?
|
|
|
Tellurium
Hazard to Self
Posts: 84
Registered: 12-7-2017
Location: Group 16, Chalcogen City
Member Is Offline
Mood: smelly
|
|
I needed some new glassware, mainly round bottom flasks, a vigreux column and a new separatory funnel. But because it wasn't much more money than
buying the stuff individualy I got the whole "organic chemistry kit" from deschem. Also I talked to deschem to swap some stuff I don't need(really who
needs a graham condenser?) for other stuff that I need. So in reality I payed around the same amount than buying the stuff individualy, but compared
to buying the stuff individualy for that price I got a lot of stuff "on top" for free. Most of this I already have(condensers, distillation adapters,
etc.) but in case one breaks it's always nice to have some laying around.
This stuff already arrived, but a new order is already on the way, but just a few small parts, that I forgot. Rubber tube connectors for gas
generators, a thermometer adapter for my thermal couple and other stuff.
|
|
|
| Pages:
1
..
10
11
12
13
14
..
20 |
![[*]](images/xpblue/default_icon.gif){kind=icon}
