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Analysis and valorization of co-products from industrial transformation of Mahogany (Gabon) : (Khaya ivorensis A. Chev)

Abstract : The Gabon forest covers more than 85% of country, so about 22 million hectares of forest, which represents a potential of more than 400 million m3 of exploitable wood. For more than 400 species listed as exploitable, about 80 are exploitable, but only 13 are exploited on an industrial scale. Solid wood from logging in the form of logs was, until 2009, mainly intended for export. However, since that date, the Gabonese State has decided to develop its industry by requiring loggers to carry out at least a first transformation in the country.This reform has led to an increase in local transformation of logs, and therefore an increase in the production of co-products. The latter represent approximately 50% of initial log mass for sawing and around 5% for peeling. The actors of the sectors thus found themselves with the problem of an excess of products derived from the local processing of wood.General objective of this thesis is to propose an approach that makes it possible to find recovery solutions for these by-products, 85% of which are burnt in the open air.Co-products of the industrial transformation of mahogany (Khaya ivorensis A. Chev) from Gabon were thus studied in three phases. Initial work on the physicochemical characterization of bark, sapwood and heartwood of mahogany extracts has been carried out in general. We have particularly work on phenolic extracts, including tannins. Then, a way of valuing these compounds was studied: development of a tannin-based adhesive with mahogany tannins. Finally, another recovery avenue was explored: development of wood/ plastic composite with wood by-products and waste from plastic bottles.Results of various studies have shown that the mahogany tannins are rich in fisitinidin and gallocatechin monomers. The absence of free form of gallic acid was also noted. In addition, tannin-based adhesives of mahogany have shown good thermal characteristics. Furthermore, the composite has interesting physico-mechanical properties that would allow a possible valorization on a large scale.
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Arsène Bikoro Bi Athomo. Analysis and valorization of co-products from industrial transformation of Mahogany (Gabon) : (Khaya ivorensis A. Chev). Analytical chemistry. Université de Pau et des Pays de l'Adour, 2020. English. ⟨NNT : 2020PAUU3001⟩. ⟨tel-02887477⟩

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