Catalog Number
ACMA00017129
Product Name
Polyisobutylene
Description
Isobutylene is a colorless gas with a faint petroleum-like odor. For transportation it may be stenched. It is shipped as a liquefied gas under its own vapor pressure. Contact with the liquid can cause frostbite. It is easily ignited. Its vapors are heavier than air and a flame can flash back to the source of leak very easily. The leak can either be a liquid or vapor leak. It can asphyxiate by the displacement of air. Under prolonged exposure to fire or heat the containers may rupture violently and rocket. It is used in the production of isooctane, a high octane aviation gasoline.;GasVapor; Liquid;GasVapor;COLOURLESS COMPRESSED LIQUEFIED GAS WITH CHARACTERISTIC ODOUR.
IUPAC Name
2-methylprop-1-ene
Molecular Weight
56.11g/mol
Molecular Formula
C4H8;CH2=C(CH3)2;C4H8
InChI
InChI=1S/C4H8/c1-4(2)3/h1H2,2-3H3
InChI Key
VQTUBCCKSQIDNK-UHFFFAOYSA-N
Boiling Point
19.6 °F at 760 mm Hg (NTP, 1992);-6.9 °C;-7.0 °C;-6.9 °C
Melting Point
-220.5 °F (NTP, 1992);-140.4 °C;-140.7 °C;-140.3 °C
Flash Point
-105 °F (NTP, 1992);-80 °C (-112 °F) - closed cup;-105 °F (-76 °C);-76.1 °C c.c.
Density
0.59 at 68 °F (USCG, 1999);0.589 g/cu cm at 25 °C (p >1 atm);Relative density (water = 1): 0.59
Solubility
Insoluble (NTP, 1992);0.00 M;In water, 263 mg/L at 25 °C;Very soluble in ethanol and ether; soluble in benzene, sulfuric acid;Soluble in organic solvents;Solubility in water, g/100ml at 20 °C: 0.03
Color/Form
Colorless gas;Colorless volatile liquid or easily liquefied gas
Covalently-Bonded Unit Count
1
EC Number
204-066-3;271-734-9
Log P
2.34 (LogP);log Kow = 2.34;2.35
MeSH Entry Terms
2-methyl propene;2-methylpropene;isobutene;isobutylene
Monoisotopic Mass
56.0626g/mol
Other Experimental
Density: 0.6 at 20 °C;Polymerizes easily and reacts with numerous materials;Tastelss and odorless /Isobutylene polymers/;Heat of formation: -37.5 kJ/mol (liquid); -16.9 kJ/mol (gas);Henry's Law constant = 0.218 atm cu-m/mol at 25 °C;Hydroxyl radical rate constant = 5.14X10-11 cu cm/molec-sec at 25 °C
Refractive Index
Index of refraction: 1.3926 at 25 °C
Stability
Stable under recommended storage conditions.;Volatile liquid or easily liquefied gas.
UN Number
1055;1055;1055;1055
Vapor Density
1.9 (NTP, 1992) (Relative to Air);1.94 (Air = 1);Relative vapor density (air = 1): 1.94
Vapor Pressure
1 mm Hg at -157.2 °F ; 5 mm Hg at -141.7° F (NTP, 1992);2.31e+03 mmHg;2,308 mm Hg at 25 °C;Vapor pressure, kPa at 20 °C: 257
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