6.022x10^23
Harmless
Posts: 5
Registered: 14-6-2010
Member Is Offline
Mood: No Mood
|
|
Distillation adapter choices
SWIM finds himself needing to collect a few fractions under vacuum. Understanding a distillation is what is required the search was on.
Two different types have presented themselves and a consensus on what is the preferred model would be appreciated.
There seem to be two distinct types of cow’s.
A two piece unit
And a single piece unit
There has to be more of a difference than three and four arms.
Please advise which is your favorite and why.
Thanks,
The new guy.
[Edited on 14-6-2010 by 6.022x10^23]
|
|
|
DJF90
International Hazard
Posts: 2266
Registered: 15-12-2007
Location: At the bench
Member Is Offline
Mood: No Mood
|
|
SWIY should give up this whole cherade!
[Edited on 14-6-2010 by DJF90]
|
|
|
not_important
International Hazard
Posts: 3873
Registered: 21-7-2006
Member Is Offline
Mood: No Mood
|
|
Perhaps SWIY could trouble themselves to post in person, then we'd have _two_ new guys.
While swimming is a summer activity, little is done around here due to the oil leakage.
|
|
|
Magpie
lab constructor
Posts: 5939
Registered: 1-11-2003
Location: USA
Member Is Offline
Mood: Chemistry: the subtle science.
|
|
I can only see 3 receivers on each cow. Perhaps SWIY could explain which cow has 4 teats.
|
|
|
rrkss
Hazard to Others
Posts: 193
Registered: 18-12-2009
Member Is Offline
Mood: No Mood
|
|
SWIY obviously does not have any training or knowledge on this matter and definately should not be trying something advanced like fractional
distillation under vacuum. Don't want the unit to implode causing lots of cuts and possibly severe burns + fire do you?
|
|
|
mfilip62
pierced by a crossbow under a bridge while eating Billy goats
Posts: 140
Registered: 25-8-2006
Member Is Offline
Mood: I like turtles!
|
|
It depends on what you want to do,but it looks like you are not pro,su just go with something with less parts.
Keep it simple.
|
|
|
6.022x10^23
Harmless
Posts: 5
Registered: 14-6-2010
Member Is Offline
Mood: No Mood
|
|
Wow, I know it was the first post but that wasn't the warm reception I had in mind.
nothing pertinent in TFSE for "etiquette" "new guy" or "first+post"
The pics were just some generic images I grabbed. Perhaps it appears in the first picture that the flasks are 120° apart, but the one I was looking
at had them 90°.
Basically I am asking what are the different types used for so that I may make a more educated decision. I respect some of the above posters so I will
take my new-guy lashing. As pointed out I am not a professional and I will acknowledge that I am still learning. Just asking a question here as I
have read all previous posts that I could find on this subject.
|
|
|
Magpie
lab constructor
Posts: 5939
Registered: 1-11-2003
Location: USA
Member Is Offline
Mood: Chemistry: the subtle science.
|
|
Has SWIY ever performed a vacuum distillation, or any distillation, for that matter?
A cow is used for collecting 3 or 4 cuts without having to break vacuum to change receivers. The one SWIY chooses depends on how important
collecting 4 cuts vs 3 is to the distillation he has in mind.
It's not so much your question that lit us off as your use of SWIM terminology. We're trying to get away from that as it is heavily used by cooks.
Cookery and terrorism have almost destroyed home chemistry.
[Edited on 14-6-2010 by Magpie]
|
|
|
6.022x10^23
Harmless
Posts: 5
Registered: 14-6-2010
Member Is Offline
Mood: No Mood
|
|
Yes, I have successfully performed many distillations at both normal and reduced pressures. I understand the qualification questions.
I know nothing compared to some, but to others I am competent.
I also understand the forethought in selecting a three or four udder-ed cow. I am just at a loss at to the two different designs.
There must be a reason one would chose a single unit that rotates in one plane versus an two piece unit that appears to rotate about a different
plane. Do they have different names?
Here is a better pic from one of the posts I have read:
[Edited on 14-6-2010 by 6.022x10^23]
|
|
|
Lambda-Eyde
National Hazard
Posts: 860
Registered: 20-11-2008
Location: Norway
Member Is Offline
Mood: Cleaved
|
|
The setup shown in Chemrox' picture allows it to be used in conjuction with a vertical Graham or Friedrich condenser. Simply adding a 105 degree
adapter allows it to be used with a normal liebig condenser as well.
|
|
|
rrkss
Hazard to Others
Posts: 193
Registered: 18-12-2009
Member Is Offline
Mood: No Mood
|
|
I personally use a two piece unit because then the vacuum line does not interfere with rotation of the cow.
|
|
|
altech6983
Harmless
Posts: 12
Registered: 12-6-2009
Member Is Offline
Mood: No Mood
|
|
If I had to buy one it would be the two piece. No vacuum line interference and it looks easier to use overall.
|
|
|
zed
International Hazard
Posts: 2283
Registered: 6-9-2008
Location: Great State of Jefferson, City of Portland
Member Is Offline
Mood: Semi-repentant Sith Lord
|
|
Mole-Man, the moderators here, hate the SWIM (someone who is me) lingo. Makes it seem like you are possibly a criminal type....A degenerate
Hive-nik.
Around here, the archaic designation "I" is preferred. Folks just assume that in the province where you reside, you possess all required permits,
and your activities are thus completely legal.
Welcome to Science Madness. Thanks for the pictures.
[Edited on 17-6-2010 by zed]
|
|
|
6.022x10^23
Harmless
Posts: 5
Registered: 14-6-2010
Member Is Offline
Mood: No Mood
|
|
Thank-you for the replies. This is just what I was looking for. I didn't know about the lingo.
**standing corrected**
|
|
|
rrkss
Hazard to Others
Posts: 193
Registered: 18-12-2009
Member Is Offline
Mood: No Mood
|
|
Just don't forget to grease your joints before you use vacuum. Otherwise you will have vacuum jumping all over the place and risk fusing your joints
together
|
|
|
Panache
International Hazard
Posts: 1290
Registered: 18-10-2007
Member Is Offline
Mood: Instead of being my deliverance, she had a resemblance to a Kat named Frankenstein
|
|
i am aware of the second one being called a 'pig', because it looks like a few piglets taking a drink from mum.
|
|
|
devongrrl
Hazard to Self
Posts: 91
Registered: 28-7-2009
Member Is Offline
Mood: Nucleophilic
|
|
I agree with Zed, the only time I SWIM is when I put my cossie on and go to the pool.
When I used to collect different fractions I used a receiver pig onto which several miniature rb flasks could be attached and clipped using keck
clips.
The "pig" could then be rotated when required to selected the different collecting flasks.
|
|
|
Contrabasso
Hazard to Others
Posts: 277
Registered: 2-4-2008
Member Is Offline
Mood: No Mood
|
|
Realistically there are always at least two ways round each problem. In some parts of the world these adaptors are called pigs in other places cows,
but whatever the shape the function is the same and the type that you use may depend on your supplier's sources.
|
|
|
![[*]](images/xpblue/default_icon.gif){kind=icon}
