Fatty alcohol sulfates

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Fatty alcohol sulfates (FAS), often also called alkyl sulfates , are sulfates of fatty alcohols with the general formula RO-SO 3 X. The fatty alcohols are obtained on an industrial scale from fats and oils. The triacylglycerols are thereby esterified with methanol to give the corresponding Methylestern of the fatty acids and then subsequently this hydrogen to specific catalysts to fatty alcohols hydrogenated . The fatty alcohols are with sulfur trioxide or conc. Sulfuric acid converted to the sulfates. They are to be distinguished from sulfonates , which, however, have an RS bond. Fatty alcohol sulfates are water-soluble and are used as anionic surfactants . As surfactants , they are not very sensitive to water hardness and are easily biodegradable . They are used in cosmetics and paints.

Sodium lauryl sulfate

INCI-compliant table of contents on a standard shampoo. Sodium lauryl ether sulfate is marked green and sodium lauryl sulfate is marked red .

Sodium lauryl sulfate (also known as sodium dodecyl sulfate and SDS) is probably the most important fatty alcohol sulfate :

Sodium laurylsulfonate V.1.svg

Sodium Lauryl Sulphate should not be confused with Sodium Lauryl Ether Sulphate (SLES). It is well suited for foaming and has good washing properties. It is part of many products such as B. detergents, toothpastes, etc. For a long time it was also one of the main components of hand washing soaps, shampoos and shower gels, but was largely replaced by sodium lauryl ether sulfate. This irritates the skin less than sodium lauryl sulfate. Sodium lauryl sulfate can usually be found under the name 'sodium lauryl sulfate' when specifying the ingredients and sodium lauryl ether sulfate as 'sodium laureth sulfate.' These designations correspond to the English terms of these compounds and are listed under these designations due to the requirements of the International Nomenclature for Cosmetic Ingredients or INCI (= International Nomenclature of Cosmetic Ingredients).

Individual evidence

  1. ↑ Werner Städtler in: Author collective: The basic knowledge of the engineer. VEB Fachbuchverlag Leipzig, 1968, pp. 732-892, there pp. 876-877.
  2. ↑ fatty alcohol sulfates . In: Jürgen Falbe (Ed.): Römpp . 8th edition. Georg Thieme Verlag, Stuttgart 1990, ISBN 3-13-734709-2 , p. 1319 .
  3. ↑ Sodium Dodecyl Sulphate . In: Jürgen Falbe (Ed.): Römpp . 8th edition. Georg Thieme Verlag, Stuttgart 1991, ISBN 3-13-734909-5 , p. 2829 .
  4. ↑ TU-Berlin on false reports on the Internet regarding SLES , accessed on February 10, 2019.
  5. ↑ Labeling of cosmetics , accessed on February 10, 2019.