Research Article
Influence of Air Temperature and Humidity on Dehydration Equilibria and Kinetics of Theophylline
Table 3
Values of the rate constants for the three models (
,
, and
).
| T°C | Humidity (%RH) | (min−1) × 10−3 | (—) | (min−1) × 10−3 | (—) | (min−1) × 10−3 | (—) |
| | 3.8 | 1.0 | 0.885 | 0.8 | 0.998 | 1.2 | 0.999 | 20 | 11.6 | 0.4 | 0.985 | 0.1 | 0.934 | 0.3 | 0.992 | | 32.0 | 9.4 | 0.927 | 1.0 | 0.927 | 8.1 | 0.928 |
| | 3.0 | 10.4 | 0.95 | 12.1 | 0.954 | 15.8 | 0.979 | | 11.3 | 7.5 | 0.967 | 7.7 | 0.950 | 10.4 | 0.977 | 30 | 32.0 | 3.1 | 0.962 | 1.0 | 0.976 | 1.5 | 0.996 | | 43.0 | 39.4 | 0.935 | 59.8 | 0.999 | 71.7 | 0.999 | | 51.0 | 8.6 | 0.831 | 5.9 | 0.753 | 9.0 | 0.899 |
| | 2.4 | 4.9 | 0.951 | 2.2 | 0.852 | 3.7 | 0.869 | | 11.2 | 3.3 | 0.866 | 12.5 | 0.988 | 18.7 | 0.999 | 40 | 31.6 | 12.7 | 0.921 | 14.6 | 0.992 | 19.1 | 0.979 | | 42.3 | 5.2 | 0.7815 | 2.8 | 0.991 | 4.4 | 0.993 | | 48.4 | 7.4 | 0.9318 | 4.4 | 0.981 | 7.9 | 0.985 | | 53.2 | 8.0 | 0.711 | 2.2 | 0.985 | 3.6 | 0.995 |
| | 10.6 | 5.6 | 0.937 | 2.6 | 0.991 | 4.4 | 0.996 | 50 | 30.0 | 27.8 | 0.830 | 28.6 | 0.989 | 38.7 | 0.969 | | 50.0 | 16.2 | 0.941 | 19.4 | 0.979 | 2.5 | 0.986 |
| | 10.1 | 5.8 | 0.904 | 10.9 | 0.938 | 9.2 | 0.897 | | 26.0 | 23.8 | 0.962 | 30.6 | 0.973 | 38.6 | 0.996 | 80 | 44.0 | 41.5 | 0.986 | 82.5 | 0.968 | 98.0 | 0.979 | | 51.4 | 2.9 | 0.806 | 21.2 | 0.954 | 32.0 | 0.946 |
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