Synthèse du Paracétamol (Acétaminophène)

L'analgésique le plus prescrit dans le monde

Pharmaceutical & Drug Manufacturing Global Industrial Scale $680 million

Aperçu

Paracetamol (acetaminophen) is the most widely used analgesic and antipyretic drug globally, with annual production exceeding 145,000 tons. The industrial synthesis proceeds through reduction of p-nitrophenol to p-aminophenol, followed by acetylation with acetic anhydride. Modern catalytic hydrogenation methods have replaced older iron-acid reduction, improving yields and reducing waste. The drug is formulated into tablets, capsules, liquids, and suppositories for over-the-counter and prescription use.

Procédé chimique

p-Nitrophenol is catalytically hydrogenated to p-aminophenol using Pt/C or Pd/C catalyst at moderate pressure. The aminophenol is then acetylated with acetic anhydride in aqueous solution to form paracetamol, which is crystallized and dried.

HOC₆H₄NO₂ + 3H₂ →[Pd/C] HOC₆H₄NH₂ + 2H₂O
HOC₆H₄NH₂ + (CH₃CO)₂O → HOC₆H₄NHCOCH₃ + CH₃COOH

Matières premières

  • p-Nitrophenol (C₆H₅NO₃) — Nitration of phenol (Starting material)
  • Hydrogen gas (H₂) — Steam methane reforming (Reducing agent)
  • Acetic anhydride ((CH₃CO)₂O) — Ketene process (Acetylating agent)

Produits finis

  • Paracetamol (C₈H₉NO₂) — Analgesic and antipyretic (USP grade, >99% purity)
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Environmental Impact

The catalytic hydrogenation route is significantly cleaner than the older iron-acid reduction, which generated large quantities of iron oxide sludge. Acetic acid byproduct is recovered and recycled. The process has moderate environmental impact with controlled wastewater treatment.

Considérations de sécurité

Innovations récentes

A new one-pot synthesis from hydroquinone using enzymatic amidation has been developed, eliminating the need for nitrophenol intermediates.
Continuous flow hydrogenation reactors improve safety and throughput.

Échelle de production

145000

tonnes/an

$680 million

valeur marchande

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Frequently Asked Questions

What industry uses Synthèse du Paracétamol (Acétaminophène)?
Synthèse du Paracétamol (Acétaminophène) is used in the pharmaceutical & drug manufacturing sector at global industrial scale scale.
What process is involved in Synthèse du Paracétamol (Acétaminophène)?
p-Nitrophenol is catalytically hydrogenated to p-aminophenol using Pt/C or Pd/C catalyst at moderate pressure. The aminophenol is then acetylated with acetic anhydride in aqueous solution to form paracetamol, which is crystallized and dried.
What is the economic significance of Synthèse du Paracétamol (Acétaminophène)?
Synthèse du Paracétamol (Acétaminophène) has a market value of $680 million and annual production of 145,000 tons.
What is the environmental impact of Synthèse du Paracétamol (Acétaminophène)?
The catalytic hydrogenation route is significantly cleaner than the older iron-acid reduction, which generated large quantities of iron oxide sludge. Acetic acid byproduct is recovered and recycled. The process has moderate environmental impact with controlled wastewater treatment.
What raw materials are used in Synthèse du Paracétamol (Acétaminophène)?
The main raw materials include: p-Nitrophenol (C₆H₅NO₃), Hydrogen gas (H₂), Acetic anhydride ((CH₃CO)₂O).