The main objective of the SOLRESS project is to propose an integrated biorefinery system to replace the chemical origin of some of the most widely used solvents in the industry, such as ethyl acetate, ethyl lactate and butyl acetate with a bio-based origin from second generation sugars from post-consumer coffee grounds and lignocellulosic feedstocks. The aim is to reinforce the integration of bio-based research and innovation throughout industrial bio-based systems. Moreover, in the valorisation process of these feedstocks, not only the cellulose fraction will be valorised, but also the hemicellulose fraction to obtain 2 of the most notorious green solvents of today, 2-MeTHF and GVL, from an additional line dedicated to the processing of furfural. The challenges will lie in improving downstream purification (DSP) processes and the techniques employed to achieve a technology that is efficient and costcompetitive with current chemical production systems for solvents. At the end of the project, all solvents will be validated in at least 3 of the most relevant applications (productive processes,formulations and recycling technologies) & at least 3 of the sectors with the greatest use of solvents (paints & coatings, cosmetics & materials processing) with the aim of evaluating its performance in comparison with its fossil-based counterparts, but also as a replacement for other dangerous and toxic solvents, such as NMP, CCL4, THF or toluene.Thus, the ambition of the SOLRESS project is triple: .- To replace the use of fossil, non-renewable raw materials with specific bio-based feedstocks in the production of some of the most widely used solvents. .- Offer SSbD alternatives to controversial solvents in terms of danger & toxicity (including the ones under the SVHC & SoCs categories). .- To improve the competitiveness of these processes by incorporating new methods & technologies that increase efficiency & sustainability, demonstrating their scalability & industrial applicability.

The SOLRESS project will develop an integrated biorefinery system that replaces fossil-based solvents—such as ethyl acetate, ethyl lactate, butyl acetate, ethanol, and butanol—with bio-based alternatives derived from second-generation sugars obtained from post-consumer coffee and lignocellulosic feedstocks. Both cellulose and hemicellulose fractions were valorized, enabling the additional production of green solvents 2-MeTHF and GVL through a dedicated furfural processing line. All bio-based solvents were successfully validated in key industrial applications, including paints and coatings, cosmetics, and recycling and delamination processes. Furthermore, an innovative extraction and downstream processing (DSP) method based on renewable electricity and zero chemical input was developed, reinforcing sustainability and circularity within bio-based industrial systems.