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CAS No 74-98-6 , propane

  • Name: propane
  • Synonyms: propan; liquefied; Dimethylmethane;n-Propane;propane; Petroleum gas; Propyl hydride; 74-98-6; Propyldihydride; Propane liquefied;
  • CAS Registry Number:
  • Transport: UN 1978 2.1
  • Melting Point: -188 °C(lit.)
  • Flash Point: -104ºC
  • Boiling Point: -42.1 °C(lit.)
  • Density: 1.55 g/mL at 25 °C(lit.)
  • Water Solubility: 0.01% in water
  • Safety Statements: Central nervous system effects at high concentrations. An asphyxiant. Flammable gas. Highly dangerous fire hazard when exposed to heat or flame; can react vigorously with oxidizers. Explosive in the form of vapor when exposed to heat or flame. Explosive reaction with ClO2. Violent exothermic reaction with barium peroxide + heat. To fight fire, stop flow of gas. When heated to decomposition it emits acrid smoke and irritating fumes.
  • Hazard Symbols: TLV: Asphyxiant (Proposed: TWA 2500 ppm). Flammable, dangerous fire risk, explosive limits in air 2.4–9.5%. For storage, see butane (note).
  • Flash Point: -104ºC
  • EINECS: 200-827-9
  • Molecular Weight: 44.09562
  • InchiKey: ATUOYWHBWRKTHZ-UHFFFAOYSA-N
  • InChI: InChI=1S/C3H8/c1-3-2/h3H2,1-2H3
  • Risk Statements: 12
  • Molecular Formula: C3H8
  • Molecular Structure:CAS No:74-98-6 propane
References of propane
Title: Propane
CAS Registry Number: 74-98-6
Synonyms: Dimethylmethane; propyl hydride
Molecular Formula: C3H8
Molecular Weight: 44.10
Percent Composition: C 81.71%, H 18.28%
Line Formula: CH3CH2CH3
Literature References: Constituent of natural gas and of crude petroleum. Obtained by the so-called "stabilization process" using fractional distillation under pressure: Francis, Robbins, J. Am. Chem. Soc. 55, 4339 (1933). Many syntheses, e.g., by using butyronitrile and sodium: Timmermans, J. Chim. Phys. 18, 133 (1920).
Properties: Gas. Odorless when pure. Burns with a luminous, smoky flame. Explosive limits, % by vol in air: 2.37-9.5. Heavier than air. One liter weighs 2.0200 g at 0° and 760 mm; 1.8324 g at 25° and 760 mm. Liquefies at -42°; solid at -187.7°. bp (1 atm) -42.1°; bp (2 atm) -25.6°; bp (5 atm) 1.4°; bp (10 atm) 26.9°; bp (20 atm) 58.1°; bp (30 atm) 78.7°; bp (40 atm) 94.8°. Crit temp 96.81°; crit press. 42.01 atm. Heat of combustion (const vol) 528.4 cal, (const pressure) 553.5 cal. 100 vols water dissolve 6.5 vols at 17.8° and 753 mm pressure; 100 vols abs alc dissolve 790 vols at 16.6° and 754 mm pressure; 100 vols ether dissolve 926 vols at 16.6° and 757 mm pressure; 100 vols chloroform dissolve 1299 vols at 21.6° and 757 mm pressure; 100 vols benzene dissolve 1452 vols at 21.5° and 757 mm pressure; 100 vols turpentine dissolve 1587 vols at 17.7° and 757 mm pressure.
Boiling point: bp (1 atm) -42.1°; bp (2 atm) -25.6°; bp (5 atm) 1.4°; bp (10 atm) 26.9°; bp (20 atm) 58.1°; bp (30 atm) 78.7°; bp (40 atm) 94.8°
CAUTION: Potential symptoms of overexposure are dizziness, confusion, excitation, asphyxia; direct contact with liquid may cause frostbite. See NIOSH Pocket Guide to Chemical Hazards (DHHS/NIOSH 97-140, 1997) p 262.
Use: As fuel gas, sometimes mixed with butane. In organic syntheses. As refrigerant.