Sciencemadness Discussion Board
Not logged in [Login ]
Go To Bottom

Printable Version  
Author: Subject: Prepare potassium perfulfate
FrankRizzo
Hazard to Others
***




Posts: 200
Registered: 9-2-2004
Member Is Offline

Mood: No Mood

[*] posted on 7-9-2007 at 13:48
Prepare potassium perfulfate


I'd like to prepare potassium persulfate using the monopersulfate (Oxone) as the starting material (I've got a cheap supply) and possibly electrolysis or some other fairly straightforward reaction mechanism. Is this a realistic endeavor?
View user's profile View All Posts By User
Ozone
International Hazard
*****




Posts: 1269
Registered: 28-7-2005
Location: Good Olde USA
Member Is Offline

Mood: Integrated

[*] posted on 7-9-2007 at 18:57


See:

http://www.sciencemadness.org/talk/viewthread.php?tid=8113&a...


And:

http://www.freepatentsonline.com/6200440.html

Cheers,

O3




-Anyone who never made a mistake never tried anything new.
--Albert Einstein
View user's profile View All Posts By User
FrankRizzo
Hazard to Others
***




Posts: 200
Registered: 9-2-2004
Member Is Offline

Mood: No Mood

[*] posted on 10-9-2007 at 13:58


Thanks Ozone; of course I've been a member here for a while so I know to search before posting a new topic. ;)

I'm looking for information specifically on creating potassium persulfate *from* the monopersulfate. The persulfate has some novel properties as an oxidizer that Oxone itself doesn't.
View user's profile View All Posts By User
Ozone
International Hazard
*****




Posts: 1269
Registered: 28-7-2005
Location: Good Olde USA
Member Is Offline

Mood: Integrated

[*] posted on 10-9-2007 at 17:19


Oops! I see what you mean. I *think* (pharma patents are deliberately obfuscate) i've found one synthesis that actually makes use of both. I have to admit that, until your question, I've always used whatever was at hand (and it usually worked).

It seems that joining them up might be tricky without triggering the decomposition of the monopersulfate prior to formation of the persulfate compound.

Just thinking here: I don't think that the "dimer"can be made without first losing O2 (and hence, 1 mole of starting material, which is usually bad). Perhaps treatment of your monopersulfate with sulfuryl chloride (SO2Cl2) could give the acidic (chlorosulfonic) intermediate and KCl. Quenching with water might give the persulfate ion and HCl. This might be salted out with KOH.

Just thinking here (nothing concrete),

O3




-Anyone who never made a mistake never tried anything new.
--Albert Einstein
View user's profile View All Posts By User
Theoretic
International Hazard
*****




Posts: 772
Registered: 17-6-2003
Location: London, the Land of Sun, Summer and Snow
Member Is Offline

Mood: eating the souls of dust mites

[*] posted on 22-9-2007 at 10:30


The composition
of Oxone is 2KHSO5.KHSO4.K2SO4

K2S2O8 + 2H2O <=> 2KHSO4 + H2O2
KHSO4 + H2O2 <=> KHSO5 + H2O
These equilibria establish themselves fairly easily at rt, so the persulfate can be prepared by adding some H2SO4 to turn (some of) the sulfate into bisulfate, so it can react with the monopersulfate, but for 4 moles of K2S2O8 you will have 1 mole of K2SO4 (or 2 of KHSO4, depending on how much acid you added), and you will have to add hydrogen peroxide to turn everything into persulfate.




View user's profile View All Posts By User

  Go To Top