Determination of kinetic parameters and thermodynamic properties of melon seed pyrolysis

Abstract

The aim of this study is to examine the behaviour of melon seed pyrolysis and to calculate its kinetic parameters along with thermodynamic properties. The thermogravimetric analysis experiments were conducted from ambient temperature to 800°C under nitrogen atmosphere at the heating rates of 5, 10, 20 and 40°C/min. It was determined that the pyrolysis process underwent through four stages where the second and third stages were the active pyrolysis stages. Kinetic calculations were carried out using model-free Flynn-Wall-Ozawa, Kissinger-Akahira-Sunose, Starink and model-based Coats-Redfern methods. The apparent activation energy values of the second and third stages were calculated to be in the ranges of 123.9–215.5 and 141.9– 234.2 kJ/mol, respectively. The Coats-Redfern method demonstrated that the second and third stages fit the reaction mechanisms of F1.65 and D5, respectively. Moreover, the enthalpy, entropy and Gibbs energy changes of the active pyrolysis stages performed at 10°C/min heating rate were determined using the results calculated from the model-free kinetic methods. The results obtained in the present study will be useful to provide necessary information needed for the design of melon seed pyrolysis processes.

Keywords

• Melon seed
• Pyrolysis behaviour
• Pyrolysis kinetics
• Thermodynamic properties

Kavun çekirdeği pirolizine ait kinetik parametrelerin ve termodinamik özelliklerin belirlenmesi

Öz

Bu çalışmanın amacı, kavun çekirdeği pirolizinin davranışını incelemek ve kinetik parametreleri ile termodinamik özelliklerini hesaplamaktır. Termogravimetrik analiz deneyleri azot atmosferinde çevre sıcaklığından 800°C’ye 5, 10, 20 ve 40°C/dk ısıtma hızlarında çalışılmıştır. Piroliz prosesinin, ikinci ve üçüncü basamakları aktif piroliz basamağı olan dört basamakta gerçekleştiği tespit edilmiştir. Kinetik hesaplamalar model içermeyen Flynn-Wall-Ozawa, Kissinger-Akahira-Sunose, Starink ve model bazlı Coats-Redfern yöntemi ile gerçekleştirilmiştir. İkinci ve üçüncü basamaklara ait görünen aktivasyon enerjisi değerlerinin sırasıyla, 123.9– 215.5 ve 141.9–234.2 kJ/mol aralıklarında olduğu hesaplanmıştır. Coats-Redfern yöntemi, ikinci ve üçüncü basamakların sırasıyla F1.65 ve D5 reaksiyon mekanizmalarına uyduğunu ortaya koymuştur. Ayrıca, 10°C/dk ısıtma hızında gerçekleştirilen piroliz prosesinin aktif piroliz basamakları için, model içermeyen kinetik yöntemlerden hesaplanan sonuçlar kullanılarak entalpi, entropi ve Gibbs enerji değişimleri hesaplanmıştır. Mevcut çalışmada elde edilen sonuçlar, kavun çekirdeği piroliz proseslerinin tasarlanmasında gerekli olan bilgileri sağlamada faydalı olacaktır.

Anahtar Kelimeler

• Kavun çekirdeği
• Piroliz davranışı
• Piroliz kinetiği
• Termodinamik özellikler

Kaynakça

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