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Pyrolysis of maize, sunflower, grape and tobacco residues
Author(s) -
Encinar José M.,
Beltrán Fernando J.,
González Juan F.,
Moreno María J.
Publication year - 1997
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/(sici)1097-4660(199712)70:4<400::aid-jctb797>3.0.co;2-6
Subject(s) - pyrolysis , sunflower , chemistry , sunflower oil , hydrogen , gas composition , carbon fibers , activation energy , reaction rate constant , heat of combustion , food science , organic chemistry , kinetics , materials science , agronomy , thermodynamics , combustion , physics , quantum mechanics , composite number , composite material , biology
Abstract Pyrolysis of four agricultural residues (maize, sunflower, grape and tobacco) has been carried out in order to quantify their energy content. The main characteristics of the charcoals formed and the nature and quantity of gases produced have been determined. The process was studied batchwise by varying the reaction time (15–60 min) and temperature (400–700°C). Reaction times higher than 30 min do not exert any influence while increasing temperature yields high fixed carbon solids, low volatile content and slight increases in ash. The increase in temperature is specially important to increase the production of gas, mainly hydrogen. From gas composition and proximate analysis, the heating power of gas and solid phases have been determined. A kinetic model of pyrolysis based on gas generation has been accomplished. From this model, rate constants of gas formation at different temperatures and activation energies have also been determined. ©1997 SCI