Recovery of clean energy precursors from Bambara groundnut waste via pyrolysis: Kinetics, products distribution and optimisation using response surface methodology. (15th October 2017)

• Record Type: Journal Article
• Authors: Mohammed, Isah Yakub; Abakr, Yousif Abdalla; Xing Hui, Jershen Nga; Alaba, Peter Adeniyi; Morris, Kenobi Isima; Ibrahim, Mustapha Danladi
• Is Part Of: Journal of cleaner production. Volume 164(2017)
• Page Start: 1430
• Page End: 1445
• Publication Date: 2017-10-15
• Subjects: Thermogravimetric analysis -- Pyrolysis -- Bambara groundnut shell -- Energy analysis -- Kinetic study; Factory and trade waste -- Management -- Periodicals; Manufactures -- Environmental aspects -- Periodicals; Déchets industriels -- Gestion -- Périodiques; Usines -- Aspect de l'environnement -- Périodiques; 628.5
• DOI: 10.1016/j.jclepro.2017.07.068
• Languages: English
• ISSNs: 0959-6526

Abstract

Abstract: This study presents first comprehensive thermochemical analysis of Bambara groundnut shell. Pyrolysis characteristics was examined under non-isothermal degradation in nitrogen atmosphere at different heating rates (10, 15 and 20 °C/min) using single-step global model kinetic model. The single-step global model average apparent activation energy was found to be 142.64 ± 5.7 kJ/mol. Pyrolysis was conducted in a fixed bed reactor. Effects of pyrolysis temperature (450–750 °C), heating rate (20–50 °C/min) and nitrogen flow rate (5–25 L/min) were investigated collectively. The process variables were optimized using response surface methodology with central composite design. Optimum bio-oil yield of 36.49 wt% was recorded at 600 °C, 50 °C/min and 11 L/min. The bio-oil, bio-char and non-condensable gas collected were comprehensively characterised. Energy analysis of the products was also evaluated. This study revealed that Bambara groundnut shell, a residue from food crop, is a potential source of energy precursors for development of a sustainable bioenergy system and biomaterials. Graphical abstract: Highlights: Comprehensive thermochemical analysis of Bambara groundnut shell. Bambara groundnut shell has average apparent activation energy of 142.64 kJ/mol. Intermediate pyrolysis Bambara groundnut shell produced optimum bio-oil of 36.49 wt%. Bambara groundnut shell bio-char produced high energy yield of 48%.