合成界面活性剤（ラウリル硫酸ナトリウム）製造

シャンプー・歯磨き粉・洗浄製品の起泡剤

Cosmetics & Personal Care Global Industrial Scale $5 billion

概要

Sodium lauryl sulfate (SLS) and sodium laureth sulfate (SLES) are the most widely used synthetic surfactants in personal care products. SLS is produced by sulfation of lauryl alcohol (from coconut or palm kernel oil) with sulfur trioxide or chlorosulfonic acid, followed by neutralization with NaOH. These anionic surfactants provide the foaming, cleansing, and emulsifying properties consumers expect in shampoos, body washes, toothpastes, and household cleaners. Despite some consumer concern, SLS has a long safety record at typical use concentrations.

化学プロセス

Lauryl alcohol (C₁₂H₂₅OH, from hydrogenation of coconut oil fatty acids) is reacted with sulfur trioxide gas in a falling-film reactor to form lauryl hydrogen sulfate. The acid ester is immediately neutralized with NaOH to produce sodium lauryl sulfate. For SLES, lauryl alcohol is first ethoxylated with 2-3 moles of ethylene oxide before sulfation, producing a milder surfactant with improved solubility.

C₁₂H₂₅OH + SO₃ → C₁₂H₂₅OSO₃H (sulfation in falling-film reactor)
C₁₂H₂₅OSO₃H + NaOH → C₁₂H₂₅OSO₃Na + H₂O (neutralization to SLS)
For SLES: C₁₂H₂₅OH + nC₂H₄O →[KOH] C₁₂H₂₅(OCH₂CH₂)ₙOH (ethoxylation, n=2-3, before sulfation)

原材料

  • Lauryl alcohol (C₁₂H₂₅OH, 1-dodecanol) — Hydrogenation of coconut/palm kernel oil (Hydrophobic chain)
  • Sulfur trioxide (SO₃) — Contact process or oleum (Sulfating agent)
  • Sodium hydroxide (NaOH) — Chlor-alkali process (Neutralizing agent)

最終製品

  • Sodium lauryl sulfate (SLS, C₁₂H₂₅OSO₃Na) — Shampoos, toothpaste, body wash, cleaners (28-30% active solution or needles)
  • Sodium laureth sulfate (SLES) — Milder shampoos and body washes (Ethoxylated version, 70% active paste)
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Environmental Impact

SLS is readily biodegradable (>95% in 28 days, OECD 301D) and has low aquatic toxicity at environmental concentrations. Palm kernel oil sourcing raises sustainability concerns. SLES production involves ethylene oxide, a known carcinogen, though no EO remains in the final product. 1,4-Dioxane as a trace byproduct of ethoxylation is monitored and minimized.

安全性の考慮事項

最新のイノベーション

Sulfate-free surfactants (amino acid-based, glucoside, and isethionate types) are gaining market share for sensitive skin products.
Bio-based sophorolipid and rhamnolipid biosurfactants from fermentation offer biodegradable alternatives.
Solid surfactant bars eliminate plastic packaging from liquid shampoo bottles.

生産規模

3000000

トン/年

$5 billion

市場価値

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Frequently Asked Questions

What industry uses 合成界面活性剤（ラウリル硫酸ナトリウム）製造?
合成界面活性剤（ラウリル硫酸ナトリウム）製造 is used in the cosmetics & personal care sector at global industrial scale scale.
What process is involved in 合成界面活性剤（ラウリル硫酸ナトリウム）製造?
Lauryl alcohol (C₁₂H₂₅OH, from hydrogenation of coconut oil fatty acids) is reacted with sulfur trioxide gas in a falling-film reactor to form lauryl hydrogen sulfate. The acid ester is immediately neutralized with NaOH to produce sodium lauryl sulfate. For SLES, lauryl alcohol is first ethoxylated
What is the economic significance of 合成界面活性剤（ラウリル硫酸ナトリウム）製造?
合成界面活性剤（ラウリル硫酸ナトリウム）製造 has a market value of $5 billion and annual production of 3,000,000 tons.
What is the environmental impact of 合成界面活性剤（ラウリル硫酸ナトリウム）製造?
SLS is readily biodegradable (>95% in 28 days, OECD 301D) and has low aquatic toxicity at environmental concentrations. Palm kernel oil sourcing raises sustainability concerns. SLES production involves ethylene oxide, a known carcinogen, though no EO remains in the final product. 1,4-Dioxane as a tr
What raw materials are used in 合成界面活性剤（ラウリル硫酸ナトリウム）製造?
The main raw materials include: Lauryl alcohol (C₁₂H₂₅OH, 1-dodecanol), Sulfur trioxide (SO₃), Sodium hydroxide (NaOH).