I am trying to prepare some iron(III) naphthenate.
And the raw materials are : ferric(III) chloride, and naphthenate acid, NaOH, toluene, deionized water
Everything worked well in lab scale: final iron(III) naphthenate dark red in color and soluble in toluene was obtained easily;
However, I encountered problem when scaling it up: it seems there are undesired side reactions, the finish goods looked like black precipitation.
Is that because naphthenate acid was oxidised by Iron(III)? or is there any other side reaction when being scaled up?
- I first dissolve
FeCl3into water separately;
NaOHaqueous solution into naphthenate acid while stirring at about 60°C;
FeCl3aqueous solution into the soldium naphthenate solution slowly;
- keep reaction temperature at about 80°C for a while and remove the water;
- reflux distillation to obtain finish goods (the maximum temperature might be high)