Extraction apparatus and method of extracting essential oils, essence, and pigments from odorous raw material by microwave heating under sub-critical conditions

摘要

The invention relates to extraction apparatus and method for obtaining essential oils and essence and pigments from odorous raw materials by microwave radiation heating under sub-critical conditions, which has advantages of easy operation, higher extracting temperature and efficiency. The microwave chamber has a power level of 100 W to 1,500 W and its microwave radiation has a frequency at 915 MHz or 2,450 MHz. The extraction process can be performed without any preheating necessary. A condenser unit is operated at temperatures between −20° C. and 15° C. for cooling the gas extractive flowing out of the extraction unit. Because both volatile aromatic compounds and pigments of the odorous raw materials can be extracted successfully, the extracted essence is colorful. Since the extraction process by microwave radiation heating is free from adding any organic solvent and/or any artificial chemical compound, the extraction apparatus and method applied are really environmentally friendly.