Propyne (ca. 4% in N,N-Dimethylformamide, ca. 1.0mol/L) , 74-99-7

CAS NO.：74-99-7

Empirical Formula: C3H4

Molecular Weight: 40.06

MDL number: MFCD00036235

EINECS: 200-828-4

PRODUCT Properties

• Melting point: -102.7 °C (lit.)
• Boiling point: -23.2 °C (lit.)
• Density: 0.6070
• vapor pressure: 204.6 mm Hg ( −49.5 °C)
• refractive index: 1.3863
• Flash point: -51 °C
• solubility: Soluble in alcohol, benzene, and chloroform (Weast, 1986)
• form: gas
• color: Colorless, flammable gas with a sweet odor
• Water Solubility: 3,640 mg/L at 20 °C (quoted, Verschueren, 1983)
• Henry's Law Constant: 0.11 at 25 °C (Hine and Mookerjee, 1975)
• Exposure limits: NIOSH REL: TWA 1,000 ppm (1,650 mg/m³), IDLH 1,700 ppm; OSHA PEL: TWA 1,000 ppm; ACGIH TLV: TWA 1,000 ppm (adopted).
• InChIKey: MWWATHDPGQKSAR-UHFFFAOYSA-N

Description and Uses

Methyl acetylene is a flammable, colorless gas with a sweet odor. Molecular weight= 40.07;Boiling point=23.3℃; Freezing/Melting point=102.8℃; Vapor pressure= 5.2 atm; Relative vapor density (air= 1)= 1.41. Explosive limits: LEL= 1.7%; UEL= 11.7%. Hazard Identification (based on NFPA-704 M Rating System): Health 2, Flammability 4, Reactivity 2. A fuel that is shipped as a liquefied compressed gas. Practically insoluble in water; solubility 0.4%.

Propyne is produced by thermal or catalytic pyrolysis of propene. Like acetylene, propyne is used as a welding torch fuel, as a specialty fuel, and chemical intermediate.

Safety

• Symbol(GHS): GHS02,GHS04,GHS07
• Signal word: Danger
• Hazard statements: H220-H280-H335
• Precautionary statements: P210-P410+P403
• Hazard Codes: F,Xi
• Risk Statements: 11-37-43
• Safety Statements: 16-36-38-37
• RIDADR: UN 1954 2.1
• OEB: A
• OEL: TWA: 1000 ppm (1650 mg/m3)
• WGK Germany: -
• RTECS: UK4250000
• HazardClass: 2.1
• PackingGroup: II
• HS Code: 2901290000
• IDLA: 1,700 ppm [10% LEL]