Paracetamol-Synthese

Das weltweit am häufigsten verschriebene Analgetikum

Pharmaceutical & Drug Manufacturing Global Industrial Scale $680 million

Übersicht

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.

Chemischer Prozess

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

Rohstoffe

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

Endprodukte

  • 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.

Sicherheitshinweise

Neuere Innovationen

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.

Produktionsmaßstab

145000

Tonnen/Jahr

$680 million

Marktwert

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Frequently Asked Questions

What industry uses Paracetamol-Synthese?
Paracetamol-Synthese is used in the pharmaceutical & drug manufacturing sector at global industrial scale scale.
What process is involved in Paracetamol-Synthese?
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 Paracetamol-Synthese?
Paracetamol-Synthese has a market value of $680 million and annual production of 145,000 tons.
What is the environmental impact of Paracetamol-Synthese?
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 Paracetamol-Synthese?
The main raw materials include: p-Nitrophenol (C₆H₅NO₃), Hydrogen gas (H₂), Acetic anhydride ((CH₃CO)₂O).