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Comparative study of the products from the pyrolysis of raw and hydrolyzed baru wastes

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Abstract

Plant biomass is a complex mixture formed mainly by cellulose, hemicellulose, and lignin, being of great importance as a source of renewable assets of great interest to industries, due to millions of tons/year of wastes produced and their great potential to yield a wide range of high added-value products. In this study, processes and physicochemical characterizations were developed for baru wastes (mesocarp and endocarp). This biomass was subjected to acid hydrolysis and slow pyrolysis steps in order to yield biobased products, among them bio-oil (> 28%) and biochar (> 48%). Analytical techniques such as mid-infrared spectroscopy and gas chromatography coupled to mass spectrometry, surface area and pore size, thermal analysis, and proximate and elemental analysis, helped in the elucidation, identification, and quantification of such compounds. Based on these results, it was possible to conclude that baru wastes have potential for application in several branches of industry, since compounds like vanillin (3.2%), syringol (9%), guaiacol (29%), creosol (22%), and palmitic (32%), and levulinic (4%) acids were found in significant amounts.

Bio-oil and biochar with high yields were obtained after the hydrolysis and pyrolysis processes.

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Authors and Affiliations

  1. University of Tocantins – UFT, Palmas, TO, 77838-824, Brazil

    Magale K. D. Rambo, Yara K. S. Nemet & Claúdio C. S. Júnior

  2. Federal Institute of Education, Science and Technology of Tocantins-IFTO, Palmas, 77020-450, Brazil

    Marcelo Mendes Pedroza & Michele C. D. Rambo

Authors
  1. Magale K. D. Rambo
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  2. Yara K. S. Nemet
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  3. Claúdio C. S. Júnior
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  4. Marcelo Mendes Pedroza
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  5. Michele C. D. Rambo
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Correspondence to Magale K. D. Rambo.

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Statement of novelty

With the increasing demand for energy and the fast depletion of petroleum resources, there is a great interest in alternative and renewable residual biomasses. This includes lignocellulosic materials that are cheap and readily available, either in the form of agricultural waste or forest residues. However, physical and chemical characterization of this biomass is required for a correct destination and better use. In this study, several methods have been applied such as thermal analysis, proximate and ultimate analysis, infrared spectroscopy, calorific value, total extractives, total lignin, and theoretical yield of bioproducts in order to determine the physical and chemical composition of the Brazilian baru residues yielded in the hydrolysis and pyrolysis processes. All these properties showed that all baru biomasses are potential sources for biofuel and biochar production, therefore presenting a great biorefining potential.

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Rambo, M.K.D., Nemet, Y.K.S., Júnior, C.C.S. et al. Comparative study of the products from the pyrolysis of raw and hydrolyzed baru wastes. Biomass Conv. Bioref. 11, 1943–1953 (2021). https://doi.org/10.1007/s13399-019-00585-0

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  • DOI: https://doi.org/10.1007/s13399-019-00585-0

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