Liquid products from Verbascum stalk by supercritical fluid extraction

CEMEK M. , Küçük M.

ENERGY CONVERSION AND MANAGEMENT, cilt.42, sa.2, ss.125-130, 2001 (SCI İndekslerine Giren Dergi) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 42 Konu: 2
  • Basım Tarihi: 2001
  • Doi Numarası: 10.1016/s0196-8904(00)00049-2
  • Sayfa Sayıları: ss.125-130


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.