Crotyl mercaptan (3-buten-1-thiol) — properties & hazards overview
Boiling point
~ 100 °C (approx.)
Flash point
~ 20–30 °C (low)
Odour threshold
Extremely low (ppb)
Water solubility
Low; slight
Flammability
Low FP; vapours ignite
Toxicity
Irritant; headache/nausea
Chronic risk
Sensitization/odor
Environmental
Odour/COD burden
| Property | Value / Note |
|---|---|
| Chemical identity | Allylic C₄ thiol (HS–CH₂–CH₂–CH=CH₂); reduced-sulfur (R–SH) compound with intense garlic/skunky odour. |
| Molar mass | ≈ 88.2 g/mol |
| Physical state | Clear, highly odorous liquid; vapours heavier than air; forms flammable mixtures with air. |
| Reactivity | Oxidizes to disulfides/sulfonates; incompatible with strong oxidizers. Forms mercaptide salts with bases/metals. |
| Behaviour in gas streams | Low intrinsic solubility → requires alkaline scrubbing plus a controlled oxidant for odour abatement and conversion to non-odorous sulfur species. |
| Best analytical detection | GC–PFPD (sulfur-selective) — highly sensitive and selective for thiols; resolves individual species down to ppb for compliance and troubleshooting. |
*Indicative values; verify exact limits and physical data via current SDS/process data (“verify via SDS”).