A vital stage in the large-scale production of biofuels from spent coffee grounds: The drying kinetics

作者：Gomez de la Cruz Francisco J^*; Cruz Peragon Fernando; Casanova Pelaez Pedro J; Palomar Carnicero Jose M

来源：Fuel Processing Technology, 2015, 130: 188-196.

DOI：10.1016/j.fuproc.2014.10.012

• Spent coffee grounds
• Drying rate
• Biofuels
• Drying kinetics
• Effective moisture diffusivity

Spent coffee grounds are being consolidated as one of the most abundant bioresources in the world for use as green energy. Biodiesel, bioethanol, bio-oil and fuel pellet are biofuels derived of this waste. To get them, spent coffee grounds need to be dried due to their high moisture content. This work analyzes their drying kinetics from isothermal drying experiments in a convective dryer at different temperatures: 100, 150, 200 and 250 degrees C, and sample thicknesses: 5, 10, 15 and 20 mm. Drying curves were fitted with the main mathematical models in the drying of agricultural products where the Two Term Gaussian model got the best results of fit. Drying rate was calculated and analyzed. Effective moisture diffusivities were calculated in a range between 129 . 10(-9) to 28.8 . 10(-9) m(2)/s. Activation energies were 12.29, 12.78, 15.18 and 16.87 kJ/mol for each sample thickness: 5, 10, 15, and 20 mm, respectively.

• 出版日期2015-2