urbaf2

NITRO DERIVATIVES OF TOLUENE 315

The overall low solubility of nitro compounds in the acids causes the distribution

coefficient of dinitrotoluene being very low (0.3-0.4). The distribution coefficient of

dinitrotoluene when a 50 : 50 mixture of 2,4-dinitrotoluene and α− trinitrotoluene was

TABLE 70

SOLUBILITY OF 2,4-DINITROTOLUENE AND α− TRINITROTOLUENE

MIXTURES IN SULPHURIC ACID

Content of 2,4-dinitro-

toluene in mixtures with

Solubility of the mixtures (in %) in sulphuric

α− trinitrotoluene

acid of different concentration

% 87% 91% 95%

,

100

76

55

35

16.6

0

8.7

7.7

6.9

6.1

21.5

16.0

14.7

12.0

11.5

10.6

10.7 54.0

9.0 36.0

30.4

25.7

22.5

19.7

TABLE 71

COEFFICIENT OF DISTRIBUTION OF DINITROTOLUENE BETWEEN

THE MINERAL AND ORGANIC LAYERS

Temperature, °C 70 80 85 90

Dissolved % of the mixture 16.8 17.9

composed of: DNT

19.3 19.0

13.8 12.9 8.9

TNT 3.0 5.0

12.1

7.2 10.1

Coefficient of distribution

R=% DNT in mineral layer

% DNT in organic

0.32 0.29 0.26

layer

0.18

treated with 90% sulphuric acid at different temperatures is given in Table 71 and

Fig. 69. Figure 70 shows the influence of the concentration of sulphuric acid

at 90°C.

FIG. 69. Influence of the temperatur :

on the distribution coefficient R of,

DNT between the mineral and organi

layers (Orlova [2a]).

% H 2 SO 4

FIG. 70. Influence of the concentration of

sulphuric acid on the distribution coefficient

R of DNT between the mineral and organic

layer (Orlova [2a]).