Thermal Behaviour Of Sodium Acetate
THERMAL BEHAVIOUR OF SODIUM ACETATE
M. Olszak-Humienik, J. Mozejko
Institute of Chemistry and Environmental Protection,
Szczecin Technical University, Szczecin, Poland
A number of studies have been published on the thermal decomposition of acetates [1-10]. The reaction stoichiometry, nature of gaseous and solid products, influence of various working conditions and kinetics of these complicated decomposition processes were investigated. The thermal decomposition of metal acetates is used as a means of preparing metal and metal oxide catalysts, some of which are of industrial importance.
In the present work we have studied thermal decomposition of sodium acetate using thermogravimetry and differential thermal analysis.
The anhydrous crystalline salt of analytical grade was supplied by P.P.H. Polskie Odczynniki Chemiczne, Gliwice Poland.
Fig.1. The TG, DTG and DTA curves of sodium acetate
Measurements were carried out on Hungarian MOM- PC derivatograph in static air, in the temperature range 20-650oC, at a heating rate of 5 deg/min. Sample mass was 20 mg.
The TG, DTG and DTA curves of the investigated compound are shown in Fig. 1.
The TG curve shows a continuous mass loss around 361-517oC. DTA shows a sharp endotherm associated with a phase transition, with a peak maximum at 320oC. Egzoterms on DTA curve, with maximum at 422, 448, 495 and 505oC, are associated with the formation of the intermediate products of decomposition and it confirmed the complexity of decomposition processes.
References
1. K.C. Patel, G.V. Chandrashekhar, M.V. George, C.N.R. Rao, Canad. J.Chem.,46 (1968) 257.
2. C. Duval, Anal.Chim.Acta, 13 (1955) 32.
3. M.A. Bernard, F. Busnot, Bull.Soc. Chim. Fr. 5 (1968) 2000.
4. C. Duval, Anal. Chim.Acta, 20 (1959) 264.
5. M.D. Judd, B.A. Plunkett, M.I. Pope, J. Thermal Anal.,6 (1974) 555-563.
6. I.C. Hisatsune, T. Adl, E.C. Beahm, R.J. Kempf, J. Phys. Chem., 74 (1970) 3225.
7. I.C. Hisatsune, E.C. Beahm, R.J. Kempf, J. Phys. Chem., 74 (1970) 3444.
8. G.A. Hussein, A.K.H. Nohman, K.M.A. Attyia, J.Therm. Anal.,42(1994) 1155.
9. G.A. Hussein, J. Therm. Anal., 42 (1994) 1091.
10. Atlas of Thermoanalytical Curves Edited by G. Liptay, Vol.1, Akademiai Kiado, Budapest 1971.
Related articles::