Pinus elliottii Engelm bark is a byproduct of Uruguay’s milling industry. As a circular economy strategy, it is burned in broilers for energy production. Aiming to increase the added value of the bark, this work analyzes the extraction of its tannins to use them in the development of formaldehyde-free adhesives, while evaluating whether it retains its calorific power for further energy production. The best extraction conditions (methanol at 65 °C for 2 h) were identified at a laboratory level after which they were scaled up to 50 L, which did not affect extraction yield. The Stiasny number remained above 65%, meaning the extractive was suitable for its use in adhesive formulations. The characterization of the extractives was completed with molecular weight distribution, FTIR-ATR, ABES and DSC. Finally, two formaldehyde-free adhesive formulations were developed using hexamine and glyoxal as hardeners. Their behaviors were compared through rheological analysis, DSC and ABES. It was determined that the adhesive formulations with hexamine at pHs of 8 and 10 are suitable for their use in the timber industry. It was noted that they react the best at a pressing temperature of 160 °C. After the extraction, the calorific power of the P. elliottii Engelm bark decreased by only 13%, thus remaining useful for energy production.

Pyrolysis is a promising thermochemical conversion method that can produce solid, liquid or gaseous products from forest biomass. In this study, eucalyptus wood chips were processed using slow pyrolysis in a prototype-scale agitated reactor. Batch pyrolysis was carried out on a 100 g sample of biomass with a heating rate of 10 °C/min. The process was conducted at three final temperatures: 400 °C, 450 °C, and 500 °C. For each temperature, residence times of 30 and 60 min were applied once the target temperature was reached. The biochars produced at each temperature were studied to verify their applications. The yield was in the range of 24–27% on a dry basis. The biochars showed characteristics appropriate for energy and environmental applications, such as improving soil properties. The bio-oils were mixed and analyzed using the GC-MS method. The yield was between 43 and 46%. When tested as a potential wood-modifying agent, the bio-oil achieved a weight percent gain of 23.41% compared to the control samples and enhanced the dimensional stability of the wood.