Energy Consumption and Hypericin content in Drying leaves of St John’s Wort (Hypericum Perfoatum

Energy Consumption and Hypericin content in Drying leaves of St John’s Wort (Hypericum Perfoatum

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Part of #Energy Consumption and Hypericin content in Drying leaves of St John’s Wort (Hypericum Perfoatum# :

Publishing year : 2012

Conference : Fourteenth National Congress of Chemical Engineering of Iran

Number of pages : 6

Abstract: Massive consumption of energy in the industry of drying makes it a matter of challenge for energy and economic aspects. Total energy consumption and the hypericin content in drying of St. John's Wort were determined using a hot-air dryer. Experiments were performed at four air temperature levels (40, 50, 60 and 70 C), three air velocities (0.3, 0.7, and 1 m / s) and three sample thickness (1, 2 and 3 cm). Based on the results of data analysis, the minimum and maximum levels of energy consumption were respectively 0.56 and 3.24 kWh respectively. Hypericin content was decreased with increasing temperature and increased with increasing airvelocity and product sample thickness, so that the maximum and minimum hypericin values were respectively 67 and 355 ppm respectively