Hydrocarbons and CO2

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Characteristics Carbon dioxide Butane Isobutane
CAS # 124-38-9 106-97-8 75-28-5
Molecular Weight, Dalton 44.01 58.1 58.1
Vapor Pressure @ 70 F., psig, (kg/cm2 ) 830 (58.3) 16.3(1.14)  30.7(2.16)
Specific Volume @ 70 F., 1 atm., ft3/lb 8.76 6.4  6.5
Boiling Point @ 1.0 atm., F (C) 31.1(-0.5) 10.9(-11.7)
Freezing Point @ 1 atm., F (C) -109.3 (-78.5) -217 (-138.3) -255 (-159.4)
Specific Gravity, Gas @ 60 F., 1 atm. (Air = 1),  1.521 2.076 2.01
Density, Liquid @ 20C., Saturation Pressure, g/ml 0.5788  0.563 
Critical Temperature, F (C) 87.8 (31) 306 (152) 275 (135)
Critical Pressure, psia, (kg/cm2 ) 1072 (75.3) 551 (38.7)  529 (37.2)
Critical Density, g/ml 0.468 0.225  0.221
Triple Point @ 5.11 atm., F (C) -69.9(-4.9)
Surface Tension @ -10C., 1 atm., dynes/cm 16.0  15.3
Viscosity, Gas @ 14.7C., 1 atm., cps 0.0148 0.0084  0.00755
Specific Heat Ratio, Gas @ 60 F., 1 atm., Cp/Cv., 1.310 1.096 1.097
Specific Heat, Gas @ 60 F., 1 atm. Cv, cal/(g)(C) 0.1565 0.3566  0.3530 
Specific Heat, Gas @ 60 F., 1 atm. Cp, cal/(g)(C) 0.205 0.3908  0.3872
Specific Heat, Liquid @ 60 F., 1 atm. Cp, BTU//(lb)(F) 0.5636  0.5695
Gross Heat of Combustion @ 60 F., 1 atm., BTU/ft3 3374  3352
Autoignition Temperature, F (C) 761 (405) 1010 (543)
Flammable Limits in Air: by volume,%  1.9-8.5 1.8-8.4
Latent Heat of Fusion @ m.p., cal/g 19.17 18.67
Latent Heat of Vaporization @ b.p.,cal/g 149.6 92.0  87.56 
Thermal Conductivity, Gas @ 32 F, BTU/(hr) (ft2 )(F/ft) 0.0085 
Thermal Conductivity, Gas @ 212F,BTU/(hr) (ft2 )(F/ft) 0.0133
Entropy, Gas @ 25C., 1 atm., cal/mol C 51.072

Last edited on:

July 06, 2006

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