INVESTIGATIONS OF THE ADSORPTION OF HALOG ENATED HYDROCARBONS .2. GAS-CHROMATOGRAPHIC ESTIMATION OF THE ZERO ADSORPTION HEATS Q(0) ON A DY-ZEOLITE

Using the technique of gaschromatography, the zero adsorption heats Q( o) were determined for 10 halogenated hydrocarbons and the correspondi ng n-paraffins with the same number of C-atoms on a zeolite of DY-type . The total substitution of H- by F-atoms in the n-alkanes results in an increase of the Q(o)-values as well as the substitution of F- by Cl -atoms in CF4. Simple equations are presented for the dependence of th e zero adsorption heats at two different temperatures on the number of C-atoms for the n-paraffins. Calculated incremental heat values for t he C-, H-, F- and the Cl-atoms allow for the calculation of Q(o)-value s for different chloro- and fluoro-chlorohydrocarbons with sufficient accuracy for technical purposes.