Liquid products from Verbascum stalk by supercritical fluid extraction

CEMEK M., Küçük M.

ENERGY CONVERSION AND MANAGEMENT, vol.42, no.2, pp.125-130, 2001 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 42 Issue: 2
  • Publication Date: 2001
  • Doi Number: 10.1016/s0196-8904(00)00049-2
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.125-130
  • Yıldız Technical University Affiliated: No


Verbascum stalk mill was converted to liquid products by using organic solvents, such as methanol, ethanol and acetone, with catalysts (10% NaOH or ZnCl2) and without catalyst in an autoclave at temperatures of 533, 553 and 573 K. The liquid products were extracted by liquid-liquid extraction using benzene and diethyl ether. The yields from supercritical methanol, ethanol and acetone extractions were 44.4, 43.3 and 60.5 wt%, respectively, at 573 K. In the catalytic runs with methanol and ethanol, the extracts were 52.4 and 44.8% using 10% NaOH and 55.5 and 60.6% using ZnCl2, respectively, at 573 K. The yields from supercritical methanol increased from 38.2 to 52.4% as the temperature was increased from 533 to 573 K in the catalytic run. (C) 2000 Elsevier Science Ltd. All rights reserved.