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Substance Name: Neutralizing agents (petroleum), spent sodium hydroxide
RN: 64742-40-1


  • TSCA Definition 2018: A complex combination consisting predominantly of water and containing sodium hydroxide and organic and inorganic sodium salts. It is obtained by neutralization of an acidic petroleum stream.

Molecular Formula

  • Unspecified

Classification Code

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Links to Resources

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Names and Synonyms


  • EINECS 265-141-4
  • Spent caustic
  • Spent caustic containing an average of 6.9 wt. % cresylate acid

Systematic Names

  • Neutralizing agents (petroleum), spent sodium hydroxide
  • Neutralizing agents, petroleum, spent sodium hydroxide

Superlist Name

  • Neutralizing agents, (petroleum), spent sodium hydroxide

Registry Numbers

CAS Registry Number

  • 64742-40-1

System Generated Number

  • 0064742401