Specific heat hydrocarbon vapors

For non-polar components like hydrocarbons, the results are very satisfactory for calculations of vapor pressure, density, enthalpy, and specific, heat and reasonably close for viscosity and conductivity provided that is greater than 0.10. 

For hydrocarbon vapors, values for P,/P, can be obtained from Figure 11, which is sufficiently accurate under all conditions for PR valve calculations. The ratio of specific heats, K, for a particular substance, varies with pressure and... 

The specific heat of hydrocarbon vapors and liquids is given by Figures 2-13 and 2-14. 

Figure 2-14. Specific heats of hydrocarbon vapors. (From Holcomb and Brown, /no. Eng. Chem., 34, 595, 1942 reprinted from Process Heat Transfer, Kern, McGraw-Hill Co., 1950.)...

Gases and Vapors Hydrocarbons Reference Symbols i Chemical Formula Mol. Wt. 1r> 1/7 I a Mol. Wt. Critical Conditions Boiling Point (F) 14,7 Psia Specific Volume Cu ft/lb 14.7 Psia 81 60F (Z Facior Accounted For) Latent Heat of Vaporization (Btu/lb 14.7 Psia) Specific heat Constant Pressure (Cp 60F) Specific heat Constant Volume Specific heat ratio K = Cp/Cv... 

Some factors that influence the rate of evaporation of a solvent include temperature, flow of air over sample, vapor pressure of the solvent, latent heat, specific heat, and molecular weight (53). Galstaun (55) in 1950 reported a thorough study of the evaporation of some hydrocarbon solvents and developed equations for evaporation rates as related to several factors including temperature drop of liquid as it evaporates. Sletmoe (56) developed equations for the evaporation of neat solvent blends. The total rate of evaporation was proposed to be equal to the sum of the rates for the individual solvent components ... 

Data Book on Hydrocarbons, D. Van Nostrand, New York, 1950, the specific heats and heats of vaporization are found. The heat to heat one mole of feed from 134 T to 170 is... 

The nomograph is based on a specific heat ratio k = 1.2, which is true for most hydrocarbon vapors. For vapors with significantly different values of k, the stack diameter obtained above is multiplied by 1.05fe°- ... 

SH = Specific heat of the hydrocarbon vapor in the preflash tower (about 0.5-0.6)... 

How many pounds of heavy hydrocarbon liquid must be vaporized to cool 700,000 Ib/hr of vapor from 980°F to 630°F Assuming a specific heat of 0.6 for the vapor and a latent heal of vaporization of 90 BTU/lb for the cycle oil ... 

The data from many studies indicate that, with proper design, selective solvents can yield H2S concentrations as low as 4 ppmv in the treated gas while permitting a major fraction of the CO2 to pass through unabsorbed. Because of its low vapor pressure, MDEA can be used in concentrations up to 60 wt% in aqueous solutions without preciable evaporation losses. Furthermore, MDEA is highly resistant to thermal and chemical degradation, is essentially noncoirosive (see Chapter 3), has low specific heat and heats of reaction with HjS and CO2 and, finally, is only sparingly miscible with hydrocarbons. 

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