Coacervate Droplet

Thank you. I was able to source a small condenser and will try to redistill. No vacuum apparatus available here but I have learned more about proper storage. The price on reagents is going up so fast it is wise to have some ability to purify the old stuff when practical. I appreciate your response. At least I know that it is not that unusual for this molecule to darken. Maillard chemistry is very interesting. The other suspect (in my mind) was the bottle of mercaptoethanol that sat next to it for years. I suppose R-NH2 is the stronger nucleophile but I wonder if R-S(minus) might compete. I lurk the forum, really enjoy the high level of professionalism and openness.

My old bottle of ethanolamine has turned brown. I wonder if anyone has some experience or suggestions with this. I can get some fresh reagent but I was surprised that this has happened. I suspect that it has been contaminated but I am pretty much the only chemist with access to that so I wonder if it has undergone some interesting reactions. The bottle is over 10 years old. Aldrich reagent grade

I am trying to understand ion exchange methodology. The Dow "tech fact" sheet on selectivity for quaternary amine resin as 1 for -OH, 5 for -H2PO4 and 22 for -Cl. Does that mean that HCl is a better elutant than a solution of Phosphoric acid of equal normality? Also, To regenerate this column would a strong solution of NaOH be best because it has the lowest selectivity and is easily displaced. Am I thinking about this correctly? This is my first post. I appreciate any dialog on this topic as I need to become proficient with basic applications of ion exchange. Right now I feel like its a roll of the dice.