Sciencemadness Discussion Board

recovery of polymer from solution

hossein0591 - 26-1-2013 at 19:59

anti-solvent for chlorobenzene;);)

unionised - 27-1-2013 at 02:10

Depends on the polymer.

bfesser - 1-2-2013 at 18:27

Rotovap off the chlorobenzene. Use your mouth on the vacuum outlet and suck in, inhaling deeply, to reduce the system pressure. When consciousness is regained, check for remaining solvent, and repeat as necessary until you're left with pure polymer.

elementcollector1 - 1-2-2013 at 21:59

Quote: Originally posted by bfesser  
Rotovap off the chlorobenzene. Use your mouth on the vacuum outlet and suck in, inhaling deeply, to reduce the system pressure. When consciousness is regained, check for remaining solvent, and repeat as necessary until you're left with pure polymer.


Well, let's not advocate suicide by stupidity just yet.

Dear hossein0591,

You've started more than 5 threads on this same subject. The fact that no one has helped you so far likely means that the answer lies within your grasp; if you'd care to do a simple search, or tell us what polymer you're working with and how you wish to extract it.

Either give us some more information than "anti-solvent for chlorobenzene" (the hell is an anti-solvent?), or work it out for yourself.

Lambda-Eyde - 1-2-2013 at 22:23

Quote: Originally posted by elementcollector1  
(the hell is an anti-solvent?)

It's a solvent (in which the desired product is insoluble) which you add to a solution to cause precipitation. Try to add acetone to a solution of table salt.

Nicodem - 2-2-2013 at 02:33

Quote: Originally posted by Lambda-Eyde  
Quote: Originally posted by elementcollector1  
(the hell is an anti-solvent?)

It's a solvent (in which the desired product is insoluble) which you add to a solution to cause precipitation. Try to add acetone to a solution of table salt.

Your definition is fine, but acetone and solutions of table salt do not mix in all proportions. In many combinations, all you get is a biphasic (liquid-liquid) or a triphasic mixture (liquid-liquid-solid), so it is not the best example. The phrase "antisolvent" is commonly used in crystallization process development (for example, in the pharmaceutical industry, but also elsewhere).