CAS 103-90-2 Industrial Grade 103-90-2 Paracetamol best quality

Preparation method

1. Nitrobenzene as raw material
Under the condition of concentrated sulfuric acid and ammonium Cetane trimethylchloride, Pd/C was used as the catalyst to catalyze the hydrogenation of nitrobenzene into a pair of aminophenols. Without separation, the direct acetylation synthesis of acetaminophen had a yield of 64.3%.

2. Nitrophenol as raw material to nitrophenol as raw material
Pd/C catalytic hydroactylation step-by-step synthesis of acetaminophen, the best solvent is acetic acid, the dosage of nitrophenol 2 to 5 times, acetaminophen yield of up to 95%. After changing the catalyst to Pd-La/C, the acetaminophen yield reached 97%.

3. To acetaminophen as raw material to acetaminophen and acetic anhydride as raw materials
Zinc powder as an antioxidant, activated carbon as a color remover, dilute acetic acid as a reaction medium, microwave radiation technology to synthesize acetaminophen, yield of up to 81.2%.

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