サリチル酸のアセチル化によるアスピリン合成

世界で最も広く使われる鎮痛剤

Pharmaceutical & Drug Manufacturing Global Industrial Scale $1.3 billion

概要

Aspirin (acetylsalicylic acid) is manufactured through the acetylation of salicylic acid with acetic anhydride. First synthesized by Felix Hoffmann at Bayer in 1897, aspirin remains one of the most consumed medications worldwide. The industrial process uses batch reactors with precise temperature control to achieve high yields and pharmaceutical-grade purity. Annual consumption exceeds 40,000 tons globally, used as an analgesic, antipyretic, anti-inflammatory, and antiplatelet agent.

化学プロセス

Salicylic acid reacts with acetic anhydride in the presence of an acid catalyst (phosphoric or sulfuric acid) at 85-90 degrees C. The product is purified by recrystallization from ethanol-water mixtures.

C₇H₆O₃ + (CH₃CO)₂O → C₉H₈O₄ + CH₃COOH

原材料

  • Salicylic acid (C₇H₆O₃) — Kolbe-Schmitt reaction from phenol (Reactant)
  • Acetic anhydride ((CH₃CO)₂O) — Ketene process (Acetylating agent)
  • Phosphoric acid (H₃PO₄) — Wet process from phosphate rock (Catalyst)

最終製品

  • Acetylsalicylic acid (C₉H₈O₄) — Analgesic and antiplatelet drug (USP grade, >99.5% purity)
  • Acetic acid (CH₃COOH) — Recycled or sold as byproduct (Recovered by distillation)
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Environmental Impact

The synthesis generates acetic acid as a byproduct, which is typically recovered and recycled. Solvent use in recrystallization contributes to VOC emissions, though modern plants use closed-loop solvent recovery. Overall environmental footprint is moderate compared to more complex pharmaceuticals.

安全性の考慮事項

最新のイノベーション

Continuous flow synthesis methods have been developed to replace traditional batch processing, offering better heat transfer, reduced reaction times, and improved safety.
Green chemistry approaches using ionic liquid catalysts are being explored to eliminate acid waste.

生産規模

44000

トン/年

$1.3 billion

市場価値

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Frequently Asked Questions

What industry uses サリチル酸のアセチル化によるアスピリン合成?
サリチル酸のアセチル化によるアスピリン合成 is used in the pharmaceutical & drug manufacturing sector at global industrial scale scale.
What process is involved in サリチル酸のアセチル化によるアスピリン合成?
Salicylic acid reacts with acetic anhydride in the presence of an acid catalyst (phosphoric or sulfuric acid) at 85-90 degrees C. The product is purified by recrystallization from ethanol-water mixtures.
What is the economic significance of サリチル酸のアセチル化によるアスピリン合成?
サリチル酸のアセチル化によるアスピリン合成 has a market value of $1.3 billion and annual production of 44,000 tons.
What is the environmental impact of サリチル酸のアセチル化によるアスピリン合成?
The synthesis generates acetic acid as a byproduct, which is typically recovered and recycled. Solvent use in recrystallization contributes to VOC emissions, though modern plants use closed-loop solvent recovery. Overall environmental footprint is moderate compared to more complex pharmaceuticals.
What raw materials are used in サリチル酸のアセチル化によるアスピリン合成?
The main raw materials include: Salicylic acid (C₇H₆O₃), Acetic anhydride ((CH₃CO)₂O), Phosphoric acid (H₃PO₄).