Part 2. The solubility of
water (2) in 1,1,-dichloroethane (1) has been reported in three works only.
The agreement is quite good in general, however, some discrepancy is apparent
at 20oC between the investigators at the same laboratory.9,12
The combined data of Staverman,16 Newsham,9 and Barr and
Newsham12 were used for the smoothing equation:
log10 x2 = 1.2719 – 1049.07/(T/K).
This equation represents the combined
data with a standard deviation of 4.13 × 10–2 in the temperature range from 273 to 323 K. The recommended solubility values at 5 K intervals for water (2) in 1,1-dichloro-ethane (1)
are presented in Table 2.
Measured values and the curve obtained
from the smoothing equation for solubility expressed as log10 x2
versus the reciprocal of absolute temperature are shown in Fig. 20. The figure
illustrates the linear relation between the solubility expressed as log10x2
versus 1/T(K). Such straight line plots are characteristic for water solubility
in halogenated hydrocarbons. The reader should consult the Preface for further
details.
The 1,1-dichloroethane (1) and water (2) binary system is treated in two parts; part 1 is 1,1-dichloroethane (1) in water (2) and part 2 is water (2) in 1,1-dichloroethane (1).
Part 1. The solubility of 1,1-dichloroethane (1) in water (2) has been studied by 15 groups of investigators in the temperature interval from 273 to 323 K with resonably good agreement. However, some reported measurements have been rejected. The datum of Ley et al.1 is significantly lower than all other measurements and is therefore rejected. The solubility values of Howe et al.2 are several per cent higher than those calculated from the smoothing equation and are also rejected.
The remaining data of Rex,3 Gross,4 Wright and Schaffer,5 van Arkel and Vles,6 Walraevens et al., 7 Sato and Nakijima, 8 Newsham,9 McNally and Grob,10,11 Barr and Newsham, 12 Gossett,13 Warner et al.,14 and Wright et al.15 were used to obtain the following mass percent (1) equation:
Solubility [100 w1] = 9.4136 - 5.7249 x 10-2 (T/K) + 9.17839 x 10-5 (T/K)2,
which shows a standard deviation of 3.70 x 10-2 in the temperature range from 273 to 323 K.
The measurements and the curve obtained from the smoothing equation are shown in Fig. 19. A solubility minimum calculated from the above regression equation is 0.487 [100 w1] at 377.87 K. Additional details concerning the solubility minimum for aqueous hydrocarbon systems are discussed in the Preface.
The recommended solubility values at 5 K intervals for 1,1-dichloroethane (1) in water (2) are presented in Table 1.