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All 6 posts   Subject: Azeotropic DMF and DMSO removal   Please login to post   Down

 
    Osmium
(Stoni's sexual toy)
11-08-04 01:26
No 540292
User Picture 
      Azeotropic DMF and DMSO removal     

Is there a way to remove DMF or DMSO azeotropically? I seem to remember that one of them forms an azeotrope with acetic acid, does anyone know for sure?

I want to exchange either one of those solvents against a simple aliphatic alcohol or water, but unfortunately the solution cannot be evaporated completely and the desired solvent then added to the residue. The exchange needs to be somewhat gradually, because once the dissolved stuff precipitates it's very difficult to get it back into solution.

BUSH/CHENEY 2004! After all, it ain't my country!
www.american-buddha.com/addict.war.1.htm
 
 
 
 
    Captain_America
(Über-Führer die Ironie)
11-08-04 01:35
No 540295
      Ah, Don Corleone is visiting..     

I seem to remember that one of them forms an azeotrope with acetic acid, does anyone know for sure?

I typed dmf azeotrope in google, first hit proved it forms azeotrope with formic acid... Now, may I kiss your ring?

http://www.junkmusik.com/junkvideo.mov
 
 
 
 
    lugh
(Moderator)
11-08-04 01:58
No 540301
      Xylene/DMF azeotrope
(Rated as: good read)
    

According to this document on solvents found on the web, xylene forms an azeotrope with dimethyl formamide wink



Chemistry is our Covalent Bond
 
 
 
 
    lugh
(Moderator)
11-11-04 01:17
No 540944
      More Azeotropes with Dimethylformamide     

Library research indicates that only para xylene forms an azeotrope with dimethylformamide wink Other compounds listed that form a binary azeotrope with dimethylformamide are heptane, acetonitrile, methyl formate, benzene, toluene, formic acid, 3-chloro 2,2,3-trifluoropropionic acid, 3-chloro 2,3,3-trifluoropropionamide, 1,4 Dimethyl-4-vinyl cyclohexene, 2,2,3,3 tetrafluoropropionic acid, 2,2,3,3 tetrafluoropropioamide and 1-Methyl-3-(1-methylethylideno) cyclohexane tongue Dimethylformamide also forms a ternary azeotrope with toluene and heptane laugh

Chemistry is our Covalent Bond
 
 
 
 
    Osmium
(Stoni's sexual toy)
11-11-04 01:47
No 540946
User Picture 
      Got any values for the more common solvents?     

Got any values for the more common solvents?

BUSH/CHENEY 2004! After all, it ain't my country!
www.american-buddha.com/addict.war.1.htm
 
 
 
 
    lugh
(Moderator)
11-12-04 02:37
No 541141
      Data Retrieved
(Rated as: excellent)
    

Pages 6 180-200 from the 85th edition of CRC Handbook of Chemistry and Physics:



The URL of DDBST; an online source of azeotropic and other useful chemical data:

http://www.ddbst.de/new/Default.htm

An article on the synthesis of aliphatic dimethylamides, including dimethylformamide, and some data on the azeotrope with formic acid, JACS 59 401 (1937)



An abstract on the same azeotrope from Chemical Abstracts 53 798:

CA53-798.jpg

Another abstract on the azeotrope with methyl formate, Chemical Abstracts 57 14483:

CA57-14483.jpg

Another abstract on the azeotropes with toluene and xylene, which disagrees somewhat with the other source on the same subject, Chemical Abstracts 71 54224:

CA71-54224.jpg

An abstract that has data on the ternary azeotrope, Chemical Abstracts 63 14116:

CA63-14116.jpg

And three abstracts on the distillation of dimethylformamide with water, Chemical Abstracts 62 7168:

CA62-7168-a.jpg
CA62-7168-a.jpg

Chemical Abstracts 61 6445:

CA61-6445h.jpg
CA61-6445g.jpg

and Chemical Abstracts 55 13023:

CA53-798.jpg

cool

Chemistry is our Covalent Bond
 
 

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