Product Identification

Product Name

2-Butanethiol

Synonyms

2-Butanethiol
2-Butyl mercaptan
2-Mercaptobutane
sec-Butanethiol
sec-Butyl thioalcohol
sec-Butyl thiol

CAS

513-53-1

Formula

C4H10S

Molecular Weight

90.19

EINECS

208-165-2

Merck

12,1612

Beilstein/Gmelin

1718766

Beilstein Reference

4-01-00-01584

EC Class

highly flammable

Physical and Chemical Properties

Appearance

Colorless liquid, obnoxious, heavy skunk-like odor.

Solubility in water

Slightly soluble

Melting Point

-165

Boiling Point

85

Vapor Pressure

74 (25 C)

Density

0.8290 g/cm3 (20 C)

pKa/pKb

10.69 (pKa)

Partition Coefficient

2.13

Heat Of Vaporization

86.6 kJ/mol

Usage

Odorant for natural gas.

Vapor Density

3.11

Refractive Index

1.4338 (20 C)

First Aid Measures

Ingestion

Seek medical assistance.

Inhalation

Move victim to fresh air. Apply artificial respiration if victim is not breathing. Administer oxygen if breathing is difficult.

Skin

Remove contaminated clothing and wash exposed area thoroughly with soap and water. A physician should examine the area if irritation or pain persists.

Eyes

Irrigate exposed eyes with copious amounts of tepid water for at least 15 minutes. If irritation, pain, swelling, lacrimation, or photophobia persist, the patient should be seen in a health care facility.

Handling and Storage

Storage

Keep in a cool, dry, dark location in a tightly sealed container or cylinder. Keep away from incompatible materials, ignition sources and untrained individuals. Secure and label area. Protect containers/cylinders from physical damage.

Handling

All chemicals should be considered hazardous. Avoid direct physical contact. Use appropriate, approved safety equipment. Untrained individuals should not handle this chemical or its container. Handling should occur in a chemical fume hood.

Hazards Identification

Inhalation

Pulmonary edema was seen in animals near lethal concentrations.

Skin

May irritate or burn. May cause toxic effects if absorbed through the skin.

Eyes

See Skin.

Ingestion

Nausea and vomiting have been reported in humans due to the refractory odor.

Hazards

Vapors may form explosive mixtures with air. Vapors may travel to source of ignition and flash back. Most vapors are heavier than air. They will spread along ground and collect in low or confined areas (sewers, basements, tanks). Vapor explosion hazard indoors, outdoors or in sewers.

EC Risk Phrase

R 11

EC Safety Phrase

S 9 16

UN (DOT)

2347

Exposure Controls/Personal Protection

Personal Protection

Wear appropriate protective gloves, clothing and goggles.

Respirators

Wear positive pressure self-contained breathing apparatus (SCBA).

Exposure Effects

Narcosis and paralysis may be caused with concentrated vapors. Drowsiness, weakness, and mild depression may be seen at exposures of 50 to 500 ppm for one hour.

Poison Class

4

Fire Fighting Measures

Flash Point

-23

Fire Fighting

Use of water spray when fighting fire may be inefficient. Small Fires: Dry chemical, carbon dioxide, water spray or regular foam. Large Fires: Water spray, fog or regular foam. Do not use straight streams.

Upper exp. limit

9.6

Lower exp. limit

1.7

Fire Potential

In general, mercaptans are flammable substances.

Accidental Release Measures

Small spills/leaks

Make no contact with the spilled material. ELIMINATE all ignition sources and ground all equipment. Stop leak if you can do it without risk. A vapor suppressing foam may be used to reduce vapors. Absorb or cover with dry earth, sand or other non-combustible material and transfer to containers. Use clean non-sparking tools to collect absorbed material.

Stability and Reactivity

Disposal Code

6

Stability

No data.

Combustion Products

Fire will produce irritating, corrosive and/or toxic gases.

Transport Information

UN Number

2347

Hazard Class

3

Packing Group

II

HS Code

2930 90 70