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Preparation process of p-acetaminophenol

A technology for the preparation of acetaminophenol, which is applied in the field of polyphosphoric acid as a catalyst, can solve the problems of increasing the production cost of acetaminophenol and the high price of the catalyst, and achieve the effects of suppressing side reactions, low production cost and simple process

Inactive Publication Date: 2011-05-11
NORTHWEST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the one-step synthesis of APAP by catalytic hydrogenation is a better synthesis process, but the catalysts such as Pt and Pd used in it are expensive, which undoubtedly increases the production cost of paracetamol

Method used

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  • Preparation process of p-acetaminophenol

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Experimental program
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Effect test

Embodiment Construction

[0065] Add 1.0g of phenol, 0.93g of hydroxylamine hydrochloride, 3.2g of acetic acid and 9.2g of polyphosphoric acid into a 300ml three-neck round bottom flask, seal the reactor and react in an oil bath at 80°C for 5.2h, cool slightly, add about 100ml of ice water, Use ammonia water to adjust the pH to 4, pass nitrogen into the three-neck round bottom flask to replace the air 3 times, add 1.0 g of sodium bisulfite, then seal the reactor, continue to reflux in an oil bath at 112 °C for 6.2 h, cool down, and depressurize Evaporate the solvent water to dryness, wash 3 times with (40×3)ml acetone, filter out the ammonium phosphate salt, and recycle it as a fertilizer, combine the filtrates, evaporate the solvent to obtain the crude product, recrystallize with water to obtain white crystals, calculated as raw material phenol The total yield was 75.49%. 1 HMNR (400MHz, d 6 -DMSO) δ: 9.64 (s, 1H, NH), 9.14 (s, 1H, OH), 7.30-7.33 (m, 1H, Ar-H), 6.64-6.67 (m, 1H, Ar-H), 1.96 (s, 3H, ...

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Abstract

The invention provides a preparation technique of p-acetaminophenoxide; the technique includes the following steps: adding phenol, oxammonium hydrochloride, acetic acid and polyphosphate with mass ratio of 1 : 0.85 : 3.0 : 8.5 to 1 : 0.96 : 4.1 : 9.6 into a reactor and sealing the reactor; carrying out reflux reaction for 3.0 to 5.2h under normal pressure and constant temperature in an oil bath of 75 to 85 DEG C; cooling to the temperature of 20 to 30 DEG C; adding ice water of 10 to 15 times of the volume of the mixed matters into the reactor and adjusting pH to 3.5 to 4.5 by using ammonia; adding nitrogen into the reactor to replace air; adding sodium bisulfite of 1 to 2 times of the weight of phenol and then sealing the reactor, continuously carrying out reaction for 5.0 to 7.2h under the normal pressure and constant temperature in the oil bath of 110 to 132 DEG C, cooling, decompressing and vaporizing the solvent water, then using acetone to wash so as to filter out ammonium phosphate salt, combing the filtrate, vaporizing and recycling the acetone to obtain the crude product, using water to re-crystallize to obtain the white crystal of the p-acetaminophenoxide. The preparation technique of the invention takes the phenol, glacial acetic acid and the oxammonium hydrochloride as the raw materials, takes the polyphosphate as a catalyst, adopts one pot method to prepare the p-acetaminophenoxide and has the advantages of simple technique, mild reaction conditions, low manufacture cost and being environment friendly.

Description

technical field [0001] The invention belongs to the field of organic chemistry, and relates to a process for preparing acetaminophen, in particular to a process for preparing paracetamol with phenol, glacial acetic acid and hydroxylamine hydrochloride as raw materials and polyphosphoric acid as a catalyst. Background technique [0002] Acetaminophen (APAP), also known as paracetamol, is gradually replacing the previous antipyretic and analgesic drugs because of its good antipyretic and analgesic effect, rapid and long-lasting effect, small side effects on the human body, and few allergic reactions. (such as aspirin, etc.), become the preferred antipyretic and analgesic drugs in the world pharmaceutical market. In addition to being an excellent antipyretic and analgesic, paracetamol is also a synthetic intermediate for many other drugs. For example, it is used to synthesize the new expectorant drug ambroxol hydrochloride, the analgesic drug propatamol, etc. [0003] So far,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C233/25C07C231/10
Inventor 张有明李景锋熊琳魏太保
Owner NORTHWEST NORMAL UNIVERSITY
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