FROM GRAPE MARC TO GRAPE SEED OIL BY SUPERCRITICAL TECHNOLOGY: A FEASIBILITY STUDY
Exhausted grape marc is a waste produced by the distilling industries in the wine-producing regions, and its conversion into grape seed oil is already carried out, but not on a extensive scale: most of this marc remains and has to be treated somehow (landfill disposal, composting, field spreading, etc.). Moreover, none industrial plant is nowadays operative for the grape seed oil supercritical extraction: grape seed oil is extracted by means of solvents such as hexane or mechanically by pressure. The aim of this paper is to present the results of a study on the possible use of exhausted grape marc for obtaining grape seed oil by means of the supercritical technology. The idea was to treat an amount of exhausted grape marc corresponding to the production of a reference region in the north-east of Italy (15,000 ton/year), by processes in sequence such as drying, separation in its components, and finally seed oil extraction. A supercritical extraction plant has been designed capable to treat the amount of grape seed locally produced. The process scheme foresees three extractor vessels which allow operating in the counter-current mode, mandatory for industrial scale plants. The costs linked to the whole process (substrate conditioning and supercritical extraction) have been detailed. From this analysis a minimum price for the oil has been obtained which assures the economical sustainability of the process (5.5 euro/kg). The results obtained could be of international interest considering the volume of the worldwide production of exhausted grape marc and the interest towards emerging green technologies as the supercritical one.
distillery-waste reuse grape seed oil supercritical extraction
L. FIORI
University of Trento, DICA, Via Mesiano 77, 38123 Trento, Italy
国际会议
北京
英文
366-371
2010-05-17（万方平台首次上网日期，不代表论文的发表时间）