Extraction of Pigment from Walnut Husk by Supercritical CO2

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Ramezani, Nima | 2011

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 42291 (06)
University: Sharif University of Technology
Department: Chemical and Petroleum Engineering
Advisor(s): Goodarznia, Iraj; Molaei Dehkordi, Asghar
Abstract:
Juglone is a naphthoquinone compound which is found in all parts of a walnut tree; including the leaf, root, walnut green husk, and bark. It is mostly used in dyeing industries. In this study, Juglone pigment is extracted from walnut husk by using the supercritical CO2 and Ethanol as a co-solvent, and the effects of parameters such as temperature, pressure, and size of husk particles on extraction efficiency are studied. The experiments have been designed based on Taguchi algorithm. Temperature and pressure range are chosen to be 35-50°C and 90-150 bar respectively. Walnut husk particles have been prepared dry from the city of Torbat Heidarieh in different average diameters; 1500, 855, 605 and 375 μm. The samples are analyzed using CG-MS application. Analysis of Variance of experimental data reveals that pressure is the most effective parameter on Juglone extraction from husk. Also, the highest amount of extraction is reported 37.267 mgr per 100 gr husk, which occurs at 35°C and 150bar with the particle average diameter of 375μm.
Keywords:
Pigments ; Supercritical Fluid ; Carbon Dioxide ; Walnut Husk ; Juglone Pigment

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