Application of Diffusion Cells to Production of Known Concentration of Gaseous Hydrocarbons

Abstract

Diffusion coefficients have been determined for a number of hydrocarbons, including 2-methyl-1,3-butadiene, hexane, 1-hexene, heptane, 1-octene, decane, benzene, and toluene. Diffusion coefficients at a number of temperatures have been determined for hexane, 1-hexene, heptane, 1-octene, decane, and benzene. The effect of turbulence at the end of the diffusion tube, resulting from the rapid flow of carrier gas over the top of the tube, has been investigated as a function of gas flow rate, temperature, diffusion tube diameter, and tube length. These results, with related data in the literature, should aid in defining the experimental limits within which a diffusion tube apparatus may be operated so that calculated values of diffusion rate can be used, if one experimental value of the diffusion coefficient is available for the liquid compound of interest.