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75-66-1

75-66-1 structural image
Product Name: 2-Methyl-2-propanethiol
Formula: C4H10S
Synonyms: tert-Butyl mercaptan;TBM
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CHEMICAL AND PHYSICAL PROPERTIES

Physical Description Tert-butyl mercaptan is a foul-smelling organosulfur compound which is a colorless, clear liquid at ambient temperatures. It is primarily used as an odorant for natural gas, and it has an odor threshold of less than 0.33 ppb. Non-toxic at the very low concentrations used in natural gas, but the smell can cause nausea at concentrations as low as 2-3 ppm. The pure chemical is highly flammable and may cause skin and eye irritation upon direct exposure.
Color/Form Mobile liquid
Odor Heavy skunk odor
Boiling Point 149-153 °F at 760 mmHg (NFPA, 2010)
Melting Point -32 °F (ICSC, 2023)
Flash Point less than -20 °F (NFPA, 2010)
Solubility Insoluble (NFPA, 2010)
Density 0.8 (NFPA, 2010) - Less dense than water; will float
Vapor Density 3.1 (NFPA, 2010) - Heavier than air; will sink (Relative to Air)
Vapor Pressure 142.5 mmHg at 68 °F (ICSC, 2023)
Stability/Shelf Life Remarkably stable to oxidizing agents.
Decomposition The substance decomposes on burning producing toxic gases including sulfur oxides.
Odor Threshold Odor Threshold Low: 0.00081 [mmHg] The Guide in the Emergency Response Guidebook is for "Butyl mercaptan." Odor threshold (100% recognition) from CHEMINFO
Refractive Index Index of refraction: 1.41984 at 25 °C/D
Dissociation Constants pKa = 11.22 at 25 °C
Kovats Retention Index 584 594 595 587 589
Other Experimental Properties WT/GALLON: 6.71 LB; DISTILLATION RANGE: 62-67 °C
Chemical Classes Other Classes -> Thiols

SAFETY INFORMATION

Signal word Danger
Pictogram(s)

Flame
Flammables
GHS02

Exclamation Mark
Irritant
GHS07

Environment
GHS09
GHS Hazard Statements H225:Flammable liquids
H317:Sensitisation, Skin
H411:Hazardous to the aquatic environment, long-term hazard
Precautionary Statement Codes P210:Keep away from heat/sparks/open flames/hot surfaces. — No smoking.
P233:Keep container tightly closed.
P240:Ground/bond container and receiving equipment.
P273:Avoid release to the environment.
P280:Wear protective gloves/protective clothing/eye protection/face protection.
P303+P361+P353:IF ON SKIN (or hair): Remove/Take off Immediately all contaminated clothing. Rinse SKIN with water/shower.

COMPUTED DESCRIPTORS

Molecular Weight 90.19 g/mol
XLogP3 1.5
Hydrogen Bond Donor Count 1
Hydrogen Bond Acceptor Count 1
Rotatable Bond Count 0
Exact Mass 90.05032149 g/mol
Monoisotopic Mass 90.05032149 g/mol
Topological Polar Surface Area 1 Ų
Heavy Atom Count 5
Formal Charge 0
Complexity 25.1
Isotope Atom Count 0
Defined Atom Stereocenter Count 0
Undefined Atom Stereocenter Count 0
Defined Bond Stereocenter Count 0
Undefined Bond Stereocenter Count 0
Covalently-Bonded Unit Count 1
Compound Is Canonicalized Yes

PRODUCT INTRODUCTION

description

Tert-butyl mercaptan is a foul-smelling organosulfur compound which is a colorless, clear liquid at ambient temperatures. It is primarily used as an odorant for natural gas, and it has an odor threshold of less than 0.33 ppb. Non-toxic at the very low concentrations used in natural gas, but the smell can cause nausea at concentrations as low as 2-3 ppm. The pure chemical is highly flammable and may cause skin and eye irritation upon direct exposure.

RELATED SUPPLIERS

Imkemex

Maharashtra
product:Tertiary butyl mercaptan
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