separate steric acid from the mixture containing sucrose,steric acid,Red %23 40,Iron, Zinc oxide?
the question and I will try again:
So to start, let’s use a magnet to remove the iron, easy peasy.
Then, add the now iron-less mixture to water and that should allow the sucrose and Red 40 to dissolve leaving just the stearic acid and the zinc oxide as the remaining solids. Use repeated centrifugation to remove the liquid portions and save the solids.
Now, we choose a solvent that will selectively dissolve the stearic acid and leave the zinc oxide behind as an insoluble solid. In this case, ethanol would do the trick as zinc oxide is insoluble in alcohols. This may require some heating to get all of the stearic acid to dissolve, but this can be easily reversed with cooling to precipitate our end product.
Again, use centrifugation and keep the liquid portion, cool and crystallize, then use a craig tube or some other drying device to dry and separate your crystalline stearic acid.
And that should isolate your stearic acid, save for a minimal contamination from the initial mixture products- which you could purify by repeated crystallization at a cost of reduced yield.