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Author Topic: Prevention of decomposition of aldehydes  (Read 137 times)

Carrion Fairy

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Prevention of decomposition of aldehydes
« on: August 15, 2011, 10:42:39 PM »
In a 5-litre HDPE container - the original in which 3 kg were sold - still remains that amount of and lots of airspace. It will be re-bottled into HDPE maybe -  with no airspace (lemonade bottle, PET lid) and buried in the ground @ ~15 deg C for a year; as sadly a project has been placed on permanant hiatus until secure facilities are found to work in :[
The is already a deep yellow/orangey colour , what other measures could be taken to prevent its decomposition? It would be heartbreaking to return to something solid or black, haah
How much need the researchers worry?

edited for impersonality and clarity
« Last Edit: August 23, 2011, 05:28:00 AM by Carrion Fairy »

akcom

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Re: Prevention of decomposition of
« Reply #1 on: August 15, 2011, 11:16:59 PM »
I would distill it, store it under argon, and use teflon tape to seal the bottle.
« Last Edit: August 16, 2011, 03:10:17 AM by Enkidu »

lugh

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Re: Prevention of decomposition of
« Reply #2 on: August 16, 2011, 12:05:58 AM »
It would be a lot simpler to form the bisulfite adduct:

http://www.erowid.org/archive/rhodium/chemistry/eleusis/bisulfite.html

as far as long term storage in a container buried underground  8)
« Last Edit: August 16, 2011, 03:10:09 AM by Enkidu »
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reDEEMed

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Re: Prevention of decomposition of
« Reply #3 on: August 16, 2011, 12:23:16 AM »
Errr, deep orangey doesn't sound good at all. That's what spent oil looks like IMO. You can't find a deep freezer in a safe spot, storage unit or such, and keep the bucket inside frozen? Damn, dude, that sucks. That's why I didn't make a single fucking move until I was in a secure spot. It was the hardest thing I ever did, not play with all that brand new chemistry shit. I kept it boxed up and did not fuck with it except a couple times to do some plant extractions. Damn near drove me nuts. Hearing this I'm so glad I didn't let temptation get me.

I feel for you dude, I really do.
« Last Edit: August 16, 2011, 03:09:54 AM by Enkidu »
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lugh

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Re: Prevention of decomposition of
« Reply #4 on: August 16, 2011, 12:33:37 AM »
The attached document describes the formation and decomposition of the adduct  8)
« Last Edit: August 16, 2011, 03:09:44 AM by Enkidu »
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Bardo

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Re: Prevention of decomposition of
« Reply #5 on: August 16, 2011, 01:29:03 AM »
Dude I have worked with large amounts of for over 2 years and have never had issues with it's stability (and I'm talking about storing drums in non-temp controlled storage units).
« Last Edit: November 12, 2011, 05:16:23 PM by Enkidu »

Carrion Fairy

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Re: Prevention of decomposition of
« Reply #6 on: August 16, 2011, 02:17:03 AM »
Fill up the remaining airspace with marbles:D! genius
and done
thank you all
« Last Edit: August 16, 2011, 03:09:08 AM by Enkidu »

akcom

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Re: Prevention of decomposition of
« Reply #7 on: August 16, 2011, 06:31:41 AM »
If you've got a smaller amount (perhaps under 1 liters), the bisulfite is probably the best way to go.  Storage under argon is the way to do it for anything large.

Tsathoggua

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Re: Prevention of decomposition of
« Reply #8 on: August 16, 2011, 05:16:05 PM »
If one wishes to be REALLY thorough, degassing by reflux under inert gas flow, then sparging with inert gas (fish tank air stone for air pump bubbler hose end would do it I Imagine)

Glass bottles might be better than HDPE, some plastics can allow some amount of leaching or breathing for certain substances, not referring specifically to though here)

Smaller quantities could perhaps be sealed in ampoules under inert gas for very long term storage. if it will keep metallic caesium shiny and free of surface oxide/superoxide/peroxide layer indefinately, its good enough.
« Last Edit: November 12, 2011, 05:16:48 PM by Enkidu »
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marakov

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Re: Prevention of decomposition of
« Reply #9 on: August 17, 2011, 04:22:44 AM »
Quote from: lugh on August 16, 2011, 12:05:58 AM
It would be a lot simpler to form the bisulfite adduct:

http://www.erowid.org/archive/rhodium/chemistry/eleusis/bisulfite.html

as far as long term storage in a container buried underground  8)

This is correct.

Form the adduct.
Wash impurities away. Filter/Dry.

Seal adduct inside HDPE container that are inside a vacuum/heat sealed bag. Place inside one more HDPE container sealed tight with electrical tape on opening. Plastic bag over that. Bury.

Good for many years.

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