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

Printable Version  
Author: Subject: Sodium dithionite
The Austrian Scientist
Harmless
*




Posts: 30
Registered: 1-1-2018
Location: Austria
Member Is Offline

Mood: Analytical

[*] posted on 11-2-2018 at 02:16
Sodium dithionite


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?
View user's profile View All Posts By User
Magpie
lab constructor
*****




Posts: 5939
Registered: 1-11-2003
Location: USA
Member Is Offline

Mood: Chemistry: the subtle science.

[*] posted on 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 single most important condition for a successful synthesis is good mixing - Nicodem
View user's profile View All Posts By User
The Austrian Scientist
Harmless
*




Posts: 30
Registered: 1-1-2018
Location: Austria
Member Is Offline

Mood: Analytical

[*] posted on 11-2-2018 at 07:05


Good idea, thanks.
View user's profile View All Posts By User
Vomaturge
Hazard to Others
***




Posts: 286
Registered: 21-1-2018
Member Is Offline

Mood: thermodynamic

[*] posted on 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]
View user's profile View All Posts By User
The Austrian Scientist
Harmless
*




Posts: 30
Registered: 1-1-2018
Location: Austria
Member Is Offline

Mood: Analytical

[*] posted on 11-2-2018 at 10:34


Not realy, since the dithionite percipitates S when mixed with water, especially when heated.
View user's profile View All Posts By User
Vomaturge
Hazard to Others
***




Posts: 286
Registered: 21-1-2018
Member Is Offline

Mood: thermodynamic

[*] posted on 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?:o Sounds like a delicate, maybe dangerous process.

[Edited on 11-2-2018 by Vomaturge]
View user's profile View All Posts By User
Corrosive Joeseph
National Hazard
****




Posts: 915
Registered: 17-5-2015
Location: The Other Place
Member Is Offline

Mood: Cyclic

[*] posted on 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






Being well adjusted to a sick society is no measure of one's mental health
View user's profile View All Posts By User
The Austrian Scientist
Harmless
*




Posts: 30
Registered: 1-1-2018
Location: Austria
Member Is Offline

Mood: Analytical

[*] posted on 11-2-2018 at 14:14


Thanks for the link
View user's profile View All Posts By User
Corrosive Joeseph
National Hazard
****




Posts: 915
Registered: 17-5-2015
Location: The Other Place
Member Is Offline

Mood: Cyclic

[*] posted on 11-2-2018 at 14:21


No probs....... I thought you might like it

:D


/CJ




Being well adjusted to a sick society is no measure of one's mental health
View user's profile View All Posts By User

  Go To Top