Pyro
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Seporatory funnel, please advise
hi,
i'm about to buy my first seporatory funnel, and i'm stuck between 500 ml and 1000ml, a 1000 ml one is 15 dollars more, but i suppose it can't be to
big but can be too small, right?
and another thing, they look pretty delicate, can i put them in the dishwasher?
thanks for the help,
pyro
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bbartlog
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I don't see how a dishwasher would reliably get one clean. The opening is too small.
Unless you have a specific reason to think that you will be working with bigger volumes, I'd go with the smaller separatory funnel. Aside from the
cost, the larger one may be unwieldy.
The less you bet, the more you lose when you win.
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Pyro
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true, but does it make a big difference if its a bit too big?
that's a good point, as it already has a bit of a hard time drying Erlenmeyers, but the actual process will not break it?
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Vargouille
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It shouldn't break it, considering the thickness of the glass.
EDIT: Not that I would recommend putting them in the dishwasher, mind you.
EDIT 2: The water shouldn't affect the glass, but it might play havoc with the stopcock.
[Edited on 28-4-2012 by Vargouille]
[Edited on 28-4-2012 by Vargouille]
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Pyro
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ok, thanks, ill see if its possible to remove it.
but what about the size?
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Geko127
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Hell... Why not buy both.
Ask No questions and ill tell no lie\'s.
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Funkerman23
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Which size you want really depends on what you want to do. You can always use a larger funnel for smaller amounts but even with a smaller funnel you
can still do what needs to be done. My gut says go with the larger one if only to allow room to grow. as for dishwasher use I have to say one thing:
DO NOT USE A DISHWASHER THAT IS USED FOR LAB DUTY TO WASH EATING UTENSILS. that warning aside I hand wash my glass. it allows me to both wash and
inspect each piece before I put it back on the shelf.
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Pyro
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ok, so the 1000 ml one it is.
as for the dishwasher, we obviously only have one dishwasher, and we do use it for both, but i never just put em in, i wash them out with soap and
water, and put them in to get them completely free of anything i could have possibly missed and to get the nice shiny clean look. this comes from my
days at school, when all the beakers and flasks had thick rings of calk on them. it gave me the tattars. 
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Pyro
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cos hey cost 60 and 75 dollars!
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Funkerman23
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Quote: Originally posted by Pyro  | ok, so the 1000 ml one it is.
as for the dishwasher, we obviously only have one dishwasher, and we do use it for both, but i never just put em in, i wash them out with soap and
water, and put them in to get them completely free of anything i could have possibly missed and to get the nice shiny clean look. this comes from my
days at school, when all the beakers and flasks had thick rings of calk on them. it gave me the tattars. |
True true( my school was worse..a good number of start cracks where to be
had and they didn't think that was a problem) but it is an old habit I learned from my mentor. I keep as much of my lab equipment away from the main
house as possible and I'll admit I'm a miser on safety.
[Edited on 29-4-2012 by Funkerman23]
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Pyro
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i work in the kitchen under the extractor fan with a big board of wood with a rim around it on the stove, and cover the rest with newspaper or
plastic, obviously for things that involve explosions (making sodium for example) and things that involve very poisonous things i go outside.
its a bit of a contradiction, there glassware is dirty, cracked,... and they don't worry about that, but a few yrs ago they made us give them a buck
to burrow a lab coat to light a Bunsen burner, OOOO dangerous! *sarcastic*
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Hexavalent
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Not necessarily, it depends on what material your street clothing was made of. If it were a synthetic fabric or fiber, it could potentially pose a
serious fire risk, as well as melting and sticking to your skin horribly.
"Success is going from failure to failure without loss of enthusiasm." Winston Churchill
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Pyro
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i suppose,
the flame was about like a candle flame :p i always wear 100% cotton shirts, so no problem for me, but i get your point.
but a buck! i just ordered a few new lab coats online with one of my glass orders :p never more do i pay a buck for an oversized dirty labcoat.
back on topic:can i use a universial clamp to hold it? or do i need a special holder?
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Funkerman23
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| Quote: Originally posted by Pyro | i suppose,
the flame was about like a candle flame :p i always wear 100% cotton shirts, so no problem for me, but i get your point.
but a buck! i just ordered a few new lab coats online with one of my glass orders :p never more do i pay a buck for an oversized dirty labcoat.
back on topic:can i use a universial clamp to hold it? or do i need a special holder? |
Noting special is
needed for a seperatory funnel if you don't have a ring support a simple 2 or 3 prong clamp suffices.
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Magpie
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A ring of the proper size with split rubber hose pieces so not to damage the glass is very nice.
I would buy the 500mL sep funnel myself. I've never needed one bigger than that. A bigger one would just take up more storage space and not give as
clean a separation for small amounts. Losses on the wall will be greater, and it costs more too. There's a reason they make them in the smaller
sizes.
The single most important condition for a successful synthesis is good mixing - Nicodem
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Pyro
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ok, i suppose if i have more than 500 ml to do i just do 2 batches
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Magpie
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I recently bought a 10cm iron ring for my 500mL separatory funnel. Tonight I added 3 pieces of rubber hose secured in place with black electrician's
tape. As you can see this makes a nice support.
The single most important condition for a successful synthesis is good mixing - Nicodem
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Geko127
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Yep. Thats good advice. Get a 500ml & a 1ltr. They both serve there purpose. The 1ltr would be better of the two. And why the hell would you put a
sep funnel in a dishwasher ?. Oxy wash nappy soak works well cleaning glassware
Ask No questions and ill tell no lie\'s.
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Pyro
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ok,
first ill get the 1 litre one, and when i can afford it ill buy a 500ml one, but can someone say what a reasonable price is for a 1l and 500 ml sep
funnel?
and what is:''Oxy wash nappy soak works well cleaning glassware''?
thanks
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Funkerman23
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| Quote: Originally posted by Pyro | ok,
first ill get the 1 litre one, and when i can afford it ill buy a 500ml one, but can someone say what a reasonable price is for a 1l and 500 ml sep
funnel?
and what is:''Oxy wash nappy soak works well cleaning glassware''?
thanks |
You might have a good bit of luck with Laboy (http://www.laboyglass.com/index.asp) the glass is actually decent and they have plenty of options. You may have to deal with the broken English
descriptions but they are worth it. And they sell to individuals, unlike Chemglass , or Kontes.
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Pyro
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looks good, and less expensive :p
how about the:'' Oxy wash nappy soak''? what on earth is that?
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Fyndium
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I've faced most often the issue of too small separatory funnel. If the volume is 1L, the useable volume is starting from 500mL for effective shaking,
which means it can handle about 250mL of treated substance at a time. For mere layer separation this does not apply.
Btw, are there some designated uses for different shapes of separatory funnels:
- Cylindrical
- Pear shape
- Globe shape
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draculic acid69
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Hell no with the dishwasher. And with SEP funnels bigger is better.
I have a 250ml one and one time I had a liter or two to seperate.
What would have taken one afternoon with a bigger funnel now
Took a few days of splitting this liquid into small enough batches
to seperate in the funnel.never get caught out with having a too small
SEP funnel if U can avoid it
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Sulaiman
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I have not bought a sep. funnel yet
but if I do I would get one with ground joints top and bottom -
for a little more interoperability with my existing glassware.
CAUTION : Hobby Chemist, not Professional or even Amateur
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