Abstract
The thermal decomposition of benzoic acid and its derivatives containing —OH, —NH2, —COOH and —SO3H functional groups as substituents in ortho, meta and (or) para position together with sulphanilic acid was investigated. The analyses were performed using derivatograph, sample mass ranged from 50 to 200 mg, heating rates from 3 to 15 K min−1 and static air atmosphere. It has been established that thermal decomposition of these aromatic acids proceeds through three common stages. In the first stage the phase transformations occur. The following two stages are due to the formation of intermediate products of the thermal decomposition and their combustion. Principal component analysis (PCA) was applied for evaluation of the results. Thanks to this method the influence of specific functional groups and their positions on the benzene ring on the thermal decomposition of the compounds under investigation was determined.
Similar content being viewed by others
References
M. Wesołowski, Thermochim. Acta, 21 (1977) 243.
M. Wesołowski, Thermochim. Acta, 31 (1979) 133.
M. Wesołowski, Drug. Dev. Ind. Pharm., 11 (1985) 493.
E. Pawełczyk and T. Hermann, Basic principles of drug stability, PZWL, Warsaw 1982.
W. W. Wendlandt and J. A. Hoiberg, Anal. Chim. Acta, 28 (1963) 506.
W. W. Wendlandt and J. A. Hoiberg, Anal. Chim. Acta, 29 (1963) 539.
J. Györe and M. Ecet, J. Thermal Anal., 2 (1970) 397.
K. Nagata, Bull. Nat. Res. Inst. Polymer Res., 2 (1973) 13.
Y. C. Lien and W. W. Nawar, J. Food Sci., 39 (1974) 911.
K. Rajeshwar and E. A. Secco, Can. J. Chem., 54 (1976) 2509.
F. González-Vilchez, M. C. Puerta Vizcaino and M. F. Gargallo Esteban, Thermochim. Acta, 42 (1980) 295.
M. F. Gargallo Esteban, M. C. Puerta Vizcaino and F. González-Vilchez, Thermochim. Acta, 62 (1983) 257.
J. Martin-Gil, F. Martinez Villa, M. C. Ramos-Sanchez and F. J. Martin-Gil, J. Thermal Anal., 29 (1984) 1351.
M. Uher, M. Kośik and A. Martvoń, VIII Konf. Term. Anal., Vysoke Tatry, 2–5. X. 1979, Termanal 79, 273.
L. E. Cook and D. A. Hildebrand, Thermochim. Acta, 9 (1974) 129.
M. Bachratá, Ż Bczákova and M. Bleśova, Acta Fac. Pharm., 38 (1984) 97.
S. Wold, Pattern Recognition, 8 (1976) 127.
B. R. Kowalski, Anal. Chem., 52 (1980) 112R.
M. Wesołowski and T. Konarski, J. Thermal Anal., 43 (1995) 279.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Wesolowski, M., Konarski, T. Studies on the Thermal Decomposition of Benzoic Acid and its Derivatives. Journal of Thermal Analysis and Calorimetry 55, 995–1002 (1999). https://doi.org/10.1023/A:1010162607157
Issue Date:
DOI: https://doi.org/10.1023/A:1010162607157