Halogenoalkanes

Abstract

Data for chloromethane (bp − 23.76°C) were observed by Gerrard,⁽⁹⁹⁾ who also gave a diagram based on previously reported data and cited references. New data (Table 28) on bromomethane (bp 3.59°C) and chloroethane (bp 13.1°C) now enable diagrams to be drawn, as shown in Figs. 117–122. Although there are some differences in the N _MeCl, N _MeBr, and N _EtCl values for corresponding liquids which must be attributed to factors other than the tendency of the gas to condense, the latter is the main factor. At temperatures below the bp (1 atm), e. g., 0°C for bromomethane and 10°C for chloroethane, the systems are conventionally liquid-liquid systems, but the pattern is essentially the same as for temperatures above the bp. The N _EtCl data were calculated from the “cm³ A/cm³ S” data of Kaplan and Romanchuk⁽¹⁹⁸⁾ for the solubilities of chlore thane in carbon tetrachloride and in 1,2-dichloroethane at 0 and 20°C, and these are plotted in Fig. 123. The cross bars indicate the limit of the the pressure measurements. Kaplan et al. ⁽¹⁹⁷⁾ gave “cm³A/cm³S” data for kerosine, $d_4^{20} = 0.8429$ (containing 15% aromatic hydrocarbons), at 20°C. Vdovichenko and Kondratenko⁽³⁶⁴⁾ gave “vol./vol.” data for chloromethane in anisole at 20°C and 1 atm, and this leads to a value of N _MeCl = 0.113, entirely out of step with the N _MeCl vs p _MeCl data observed by Gerrard.