In-line vacuum seal?

nyarlothotep · Thu Mar 31, 2005 12:22 am

So here's the deal. SWIN is a fan of elegance. He likes things simple and pretty.
Configuring a vac. cutoff adaptor from some flow control valves and a trap flask isn't really pretty, altho is very useful for pumps.
SWIN, however, is using el cheapo aspirator station, and is not overly concerned with the health of the pump, there being a fairly large amount of water to dilute anything potentially damaging.

Found a few things over at Kontes, just to be sure they exist....
h t t p ://www.kontes.com/html/pg-211450-Vacuum_airless.html

Not too pretty.
Unlike this hot little number:
h t t p ://www.kontes.com/html/pg-211200.html

Basically SWIN doesn't like the standard undergrad "replacing a vac. distillation reciever" bit.....too inelegant. Too time consuming re-evacuating the setup. Pain in the ass.

Anyone seen anything similiar availible for a curious amature?

(links broken to hide referral site)

ApprenticeCook · DILLIGAF

no to sure what your on about but the kontes glass bits look like similar parts to what a perkin reciever does...

This is what i think you mean... you dont like having to disconnect the vacuum source to swap sections of glass or a reciever and then having to re-evacuate the entire setup? so you want something to cut off the vacuum to the section your replacing and then be able to open it up to evacuate just the changed bit?

Perkin reciever for distillation recivers, or the first link to the kontes page looks like a good one for addition funnels etc.

-AC

nyarlothotep · Thu Mar 31, 2005 2:04 pm

Lief · Fri Apr 01, 2005 7:17 am

How about using a "cow"?

ApprenticeCook · DILLIGAF

Perkin recievers are usually very expensive and fragile, they are 1 piece glass in most cases....
cows are cheaper and several bits of glass so it is better in some respects... the biggest cow i have seen has 5 limbs, each of which can only have a maximum of 25mL peak shapped flasks on them, which limits the amount of fractions and volume of the fraction you can collect...

Whereas a perkin reciever can have as larger RBF on the collector as requried... the ~20mL of space is only to hold the fraction distilling for the time it takes you to release, empty, clean and re-evacuate the RBF, or swap for a ready clean one...
So with a perkin you can have as many fractions as you want and as larger volume of each fraction as you want... eliminating the limitations of the cow...

For a cheaper alternative to a real perkin check out the rhodium mirror for the "fancy glass" page... has an alternative using a regular addition funnel and various bits and pieces.
-AC