EXTRACTS FROM COFFEE BY-PRODUCTS AS POTENTIAL RAW MATERIALS FOR FUEL ADDITIVES AND CARBON ADSORBENTS

Data about coffee consumed world-wide are somewhat contradictory. A conservative estimate, suggests a number of around 8 mln tones per year. Its production involves a comparable amount of by-products, mainly pulp, husks, skins and spent coffee grounds. Thus, a sustainable coffee industry requires the development of methods for utilization of coffee byproducts. Among these, the preparation of renewable fuel additives (e.g. biodiesel) and carbon adsorbents is a promising alternative to the eventual dumping of biogenic substances, harmful to the environment. Extraction of coffee by-products is the first step towards their utilization. This work presents results on laboratory extraction of spent coffee grounds (SCG) with different solvents, discussed in the context of the preparation of renewable fuel additives. The aim of the present study is to develop a procedure for extraction of coffee residues, suitable for production of biofuels and adsorbents.