The Austrian Scientist - 11-2-2018 at 02:16
Hi,
Yesterday i found a de - coloreizer for washing applications in a local supermarket.
The label says it contains 15 - 30 % Na2S2O4 * 2 H2O but also limonene, Linalool and optical brightners.
My Question is: Does anybody know how to seperate the dithionite from the Organic stuff without decomposing?
Magpie - 11-2-2018 at 06:54
I have used a product like that in the US called RIT for fading Levi's mostly.
It contains ~12% Na2CO3 as a stabilizer. I used it "as is"to make the glow in the dark Luminol. It worked well. I just compensate by adding more to
make up for the additives.
The Austrian Scientist - 11-2-2018 at 07:05
Good idea, thanks.
Vomaturge - 11-2-2018 at 10:18
linalool is much less soluble in water than sodium dithionite. Does it make sense to do a liquid-liquid extraction and transfer the dithionite into a
water solution? This might not work at all, or might not be effective, especially if there is any surfactants in the mix.
Another possible way would be to gradually evaporate the limonene/linalool at <100 C?
Neither process could likely get rid of the optical brightener anyhow, and it would be simpler to use it as is, if the reaction you are planning will
still work
[Edited on 11-2-2018 by Vomaturge]
The Austrian Scientist - 11-2-2018 at 10:34
Not realy, since the dithionite percipitates S when mixed with water, especially when heated.
Vomaturge - 11-2-2018 at 10:43
Okay, good to know. It still seems like the limonene and linalool could be gently evaporated. They both have flash points in the 50-60 C range, so
they're putting off plenty of fumes at that point. The tricky part would be removing these without overheating the dithionite, or exposing it to
excessive air. If there is too high of a percentage of non-volatile ingredients (besides sodium dithionite), then it still might not be possible.
Wait, why am I suggesting that you warm a solution of an air-reactive salt in a flammable liquid?
Sounds like a delicate, maybe dangerous process.
[Edited on 11-2-2018 by Vomaturge]
Corrosive Joeseph - 11-2-2018 at 13:13
I think we have been here before..........
'OTC source of sodium dithionite and synthesis' - https://www.sciencemadness.org/whisper/viewthread.php?tid=75...
/CJ
The Austrian Scientist - 11-2-2018 at 14:14
Thanks for the link
Corrosive Joeseph - 11-2-2018 at 14:21
No probs....... I thought you might like it
/CJ