Thermal analysis and determination of kinetics and thermodynamics for pyrolysis of soybean de-oiled cake using thermogravimetric analysis.

Bamboriya, Om Prakash; Varma, Anil Kumar; Shankar, Ravi; Aniya, Vineet; Mondal, Prasenjit; Thakur, Lokendra Singh

This paper described the thermal decomposition and determined the thermodynamics and kinetics for pyrolysis of soybean de-oiled cake (soya DOC). Authors analysed the physicochemical characteristics of biomass based on proximate, elemental, lignocellulosic balance, calorific value, and FTIR results. The thermogravimetric data of soya DOC were obtained at 10, 20, and 30 °C min‒1 heating rates in an inert system. Thermal analysis of soya DOC reveals that the significant mass loss occurred between 200 and 550 °C temperature ranges. The kinetic parameters (activation energy and pre-exponential factor) and thermodynamic parameters (changes in enthalpy, entropy and Gibb's free energy) were examined by Kissinger, KAS, OFW, and CR methods. Kissinger method gives Ea 121.05 kJ mol‒1, while OFW and KAS give 162.33 and 151.88 kJ mol‒1, respectively. Results reveal that the Ea depends on decomposition. For soya DOC, the pre-exponential factor is found between 4.12 × 1012 and 6.39 × 1013 min−1, and this range depends on heating rates and conversion. In order to assess the importance of the soya DOC as a pyrolysis feedstock, the activation energy of soya DOC is also compared with the other biomass and the results are found satisfactory. Simulation of soya DOC pyrolysis using data obtained from TGA analysis showed good agreement with experimental data.

PYROLYSIS kinetics; THERMOGRAVIMETRY; SOYBEAN; BIOMASS conversion; ENTHALPY

Journal of Thermal Analysis & Calorimetry, 2022, Vol 147, Issue 24, p14381

1388-6150

Academic Journal

10.1007/s10973-022-11610-2