I am getting yellowish color during the synthesis of plasticizer, which is developing because of long reaction time and higher reaction temperature.
I have tried convention methods like charcoal, bleaching earth, zeolites but didn't solve the problem.
Have you tried excluding oxygen from the process? Sounds like you are getting some thermal degredaton.
you can study the effect of pressure, N2 or Ar gas, low temperature for a long duration or/and try Vacumm conditions, can you tell me more about your plasticizer (i.e. type, chemical structure or your material)?
Dear all;
for general purposes in a chemical lab, the discoloration of the product is eliminated by passing through silica or alumina columns, other methods such as extraction and distillation also works. I don't known if you have tried any of these conventional methods. Regards
I have tried N2, but it didnt solve the problem, However I can not use lower temperature as it is refluxing at boiling of solvent i.e. ethylhexanol.
Methods like Silica and alumina are not possible as I am dealing with higher quantity. Distillation is also not possible since the boiling point of plasticizer is very high (around 400 degree C)
Yes Exaction is conveniently possible,
If there is some method,, please let me know....
Dear all;
just a small rectification about the use distillation. It is possible to lower the distillation temperature to a great extent by applying a deep vacuum. Also are sure about the 400 °C, is it and organic plasticizer?
If you know through chromatography the source of this discoloration, and if the molecular weights of the plasticizer and the other impurities are quite different, than membrane dialysis is another option to purify your product. Regards
- Badges
- Science topic