Ethyl Mercaptan (CAS 75-08-1): Overview and Properties

Ethyl Mercaptan CAS 75-08-1, also known as Ethanethiol (CAS 75-08-1), is a colorless, transparent, oily liquid renowned for its strong, persistent, garlic-like odor, earning it the title of the world’s most pungent substance according to Guinness World Records. This highly volatile compound is widely used in industries as an odorant for natural gas, a chemical intermediate, and a solvent in specific applications.

Key Properties of Ethyl Mercaptan (CAS 75-08-1)

  • Chemical Formula: C2H5SH

  • Appearance: Colorless, oily liquid

  • Odor: Strong, pungent, garlic-like smell

  • Solubility: Slightly soluble in water (1.5 wt% at 20°C), forms hydrates that crystallize below 10°C, and highly soluble in alkaline water, ethanol, and organic solvents like ether.

  • Reactivity: Chemically active, easily oxidized to diethyl disulfide, requiring low-temperature, sealed storage.

  • Physical Data:

    • Relative Density: 0.839

    • Boiling Point: 35°C

    • Flash Point: Below 0°C

    • Autoignition Temperature: 303.78°C

Applications of Ethyl Mercaptan CAS 75-08-1

Ethyl Mercaptan CAS 75-08-1, is primarily used as an odorant to detect natural gas leaks due to its distinctive smell. It also serves as a building block in synthesizing pharmaceuticals, pesticides, and other chemicals. Its solubility in organic solvents makes it valuable in laboratory and industrial processes.