Sulfuric Acid → 2-Propenoic acid, 3-phenyl-

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Reaction Conditions

Reaction Steps

100 g of crude methyl cinnamate and 926.8 g of 2.8% caustic soda were placed in a 2-liter flask equipped with a thermometer and a stirrer, and the solution was then stirred at 80° C. for 30 minutes to carry out hydrolysis. An active carbon treatment was omitted. The abovementioned aqueous solution was maintained at 40° C., and 137.1 g of 25% sulfuric acid was added dropwise to precipitate the crystals of cinnamic acid. After the addition of sulfuric acid had been over, the temperature of the solution was lowered to 20° C., followed by filtering through Nutsche. The resultant filter cake was washed with 1000 g of water, and then vacuum-dried at 50° C. to obtain 87.1 g of cinnamic acid. The purity of cinnamic acid was 96.1%, and the contents of palladium, copper and manganese were 5 ppm or less, 260 ppm, 200 ppm, respectively.

Provenance & Evidence