Diffusion Coefficient in Air – Organic Compounds

This chapter presents the values for diffusion coefficient in air (organic compounds) in tabulated format. For the tabulation, an equation is selected for diffusion coefficient in air as a function of temperature. The tabulation is arranged by carbon number such as C, C2, and C3 to provide ease of use in quickly locating the data by using the chemical formula. The compound name and chemical abstracts registry number (CAS No) are also provided in tabular form. Values for regression coefficients are given in the columns. The temperature range for use is also given in the columns (TMIN and TMAX). The equation should not be used for temperatures outside this range. The next column provides the code for the tabulation. The last three columns provide values for diffusion coefficient in air at representative temperatures. The tabulation is applicable to gas at low pressure. Data for polar and high molecular weight compounds are very limited. Also, few experimental data are available at high temperatures. Thus, the values for these compounds and high temperatures should be considered rough approximations. The values at lower temperatures in the region of ambient conditions are more accurate. A comparison of calculated and data values is also shown for a representative compound. The graph shows favorable agreement of equation and data.