Combine 21.1 g of anhydrous sodium acetate, 19.6 g of vanillin and 10 g of hydroxylamine hydrochloride. Then add 180 mL of water and start to reflux with stirring in an oil bath for 20 minutes. Let the solution cool down to room temperature and put the solution into a freezer and let it crystallize for 20 min. Afterwards, filter and recrystallize the vanillin oxime in hot water.
Refluxing in an oil bath with stirring
Vanillin oxime crystallizing out in a freezer