LIQUEFACTION OF SUNFLOWER STALK BY USING SUPERCRITICAL EXTRACTION

Sunflower stalk mill was converted to liquid products by using some or ganic solvents (methanol, ethanol and acetone) with catalyst (% 10 NaO H) and without catalyst in an autoclave at different temperatures, 523 and 563 K. The liquid products were extracted by liquid-liquid extrac tion (benzene and diethyl ether). The yields of supercritical methanol , ethanol and acetone extractions were 40.00, 45.60 and 47.80%, respec tively, at 563 K. In the catalytic runs, the methanol and ethanol extr actions were 58.03 and 54.17%, respectively, at 563 K. The yields oi s upercritical methanol extraction have been increase From 38.52 to 58.0 3% as the temperature increased from 523 to 563 K in the catalytic run . (C) 1998 Elsevier Science Ltd. All rights reserved.