Pyrolysis of microalgae residual biomass derived from Dunaliella tertiolecta after lipid extraction and carbohydrate saccharification

초록

Microalgae (Dunaliella tertiolecta) are considered potential feedstock for production of biodiesel and bioethanol due to their high lipid and carbohydrate contents. To achieve complete utilization of microalgae in a microalgae biorefinery, residual biomass after conversion of lipids and carbohydrates into biodiesel and bioethanol can be converted into bio-oils by pyrolysis. D. tertiolecta residual biomass decomposed mainly between 200 degrees C and 550 degrees C at heating rates of 5-20 degrees C/min. The apparent activation energy increased from 163.12 kJ mol(-1) to 670.24 kJ mol(-1) with increasing pyrolysis conversion. Experimental results were consistent with the proposed lumped kinetic model, and the kinetic rate constant for D. tertiolecta residual -> bio-oil (k(2)) was the highest. This result indicates that the predominant reaction pathway of D. tertiolecta residual was A (D. tertiolecta residual) to B (bio-oil), rather than A (D. tertiolecta residual) to C (gas; C-1-C-4, CO, CO2, H-2) or B (bio-oil) to C (gas; C-1-C-4, CO, CO2, H-2). (C) 2014 Elsevier B.V. All rights reserved.

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