Opportunities to Enhance the Pyrolysis of Biomass in The Production of Hydroxyapatite and Chemicals

Moreover, heating rates are dependent mainly on particle size, reactor temperature, heat transfer mechanisms, and initial biomass properties [16][17][18][19].Combustion and pyrolysis are among the literature reported thermal processes to obtain HAp [12,[20][21][22][23][24][25][26].Likewise, these methods can produce bone char, the solid product from bone processing, as well as liquid and gaseous products that can recover upgradeable organic materials for obtaining chemicals, pharmaceuticals, or energy carriers [27,28].This review covers the basics of the thermochemical processing of biomass, and it compiles pyrolysis variables and trends to find opportunities for AbstractThe pyrolysis of calcium orthophosphates produces hydroxyapatite and chemicals.Additionally, pyrolysis proposes paths to manage animalderived waste streams.As it happens in the pyrolysis of lignocellulosic biomass, operating variables like reactor temperature, reaction atmosphere, feedstock, and particle size affect the final product from animal-biomass.This review summarizes the characteristics of multiple pyrolysis methods to produce hydroxyapatite and chemicals.Finally, this short paper recommends opportunities to enhance the results by changing pyrolysis process variables, learning from lignocellulosic and animal-derived biomass experiences alike.