FriendlyFinger
Hazard to Self
Posts: 64
Registered: 14-3-2005
Member Is Offline
Mood: No Mood
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IPA and peroxides
What's the story here? How dangerous is IPA? Swim has some IPA that was used to recrystalise MeNH2.HCL and want's to recycle by drying and
distilling. Vogles points out that IPA should have peroxides removed before dehydrating. So is the peroxide story the same with every solvent;
dangerous to distill to dryness?
Swim tried this; disolved 200mg KI and made up to 2ml with dH2O, mixed this with 1ml of dilute HCL (1;5) added 6 drops of starch solution then
imediately dropped in 1ml IPA that was sitting in a beaker for 3 days and used to extract MeNH2.HCL. It did not turn purple, why not? It turned light
gold.
Swim tried it on an older batch, but same thing. Was the test not performed properley?
How about just drying with MgSO4, filtering and using this IPA to recrystalise. Will some MgSO4 get through to contaminate the MeNH2.HCL?
Kind regards,
FF
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Madandcrazy
Hazard to Others
Posts: 117
Registered: 11-5-2005
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Mood: annoyed
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Whats the IPA FriendlyFinger ?
The chemical MeNH2.HCL seems to be of interest for normal chemical reaktions.
(looking for 1,3-chloroamidoethylene  )
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Polverone
Now celebrating 21 years of madness
Posts: 3186
Registered: 19-5-2002
Location: The Sunny Pacific Northwest
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Mood: Waiting for spring
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IPA is isopropyl alcohol. It has been reported to form peroxides, but it does not do so easily. The negative test for peroxides on old IPA is
unsurprising.
PGP Key and corresponding e-mail address
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Sandmeyer
National Hazard
Posts: 784
Registered: 9-1-2005
Location: Internet
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Mood: abbastanza bene
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what, is this true? i didn't know IPA can form peroxides, shouldn't in that case alcohols generally do so, how is this supposed to happen?
[Edited on 20-7-2005 by Sandmeyer]
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S.C. Wack
bibliomaster
Posts: 2419
Registered: 7-5-2004
Location: Cornworld, Central USA
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Mood: Enhanced
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Alter ego post:
https://www.synthetikal.com/synthforum/about1265.html
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