Continuous-phase-change tea oil extraction method

Abstract

The invention provides a continuous-phase-change tea oil extraction method. According to the invention, a dried and crushed tea seed raw material is placed into an extraction kettle of a continuous-phase-change extraction device; under a condition with a pressure constantly lower than an extracting agent critical pressure and a temperature constantly lower than an extracting agent critical temperature, the extracting agent is compressed into a liquid by using a high-pressure pump; the extracting agent flows through the extraction kettle with a certain flow rate, such that tea oil is extracted; the material is delivered into a resolution kettle; heating and pressure reducing are carried out, such that the extracting agent is changed into a gas phase; instant compression is carried out, the extracting agent is changed into liquid, and flows through the extraction kettle, such that the material is extracted again. The steps are repeated several times. The method provided by the invention has the advantaged of high efficiency, no solvent residue in product, and high aroma component retention rate of supercritical extraction and subcritical extraction methods. Extraction pressure and resolution pressure of the method are lower than those of supercritical extraction. The method also has the advantages of large extraction volume, large-amount batch production, low production cost, and the like of conventional solvent extraction methods. Also, the continuous-phase-change extraction method has the advantages that the extraction time is short, instant continuous extraction process can be realized, solvent demand is low, and the solvent can be recovered.

Description

technical field [0001] The invention belongs to the technical field of vegetable oil extraction, and in particular relates to a method for extracting camellia oil by continuous phase change. Background technique [0002] Camellia oil is obtained from the seeds of Camellia oleifera. It is a unique woody oil in my country. The main economic oil crops in southern China are mainly distributed in the south of the Yangtze River Basin. Hunan, Jiangxi, Guangdong, Guangxi and other provinces are its main producers. Area. The fatty acid composition of tea oil is very similar to olive oil, the best woody edible vegetable oil recognized in the world, so tea oil is known as "Oriental olive oil". "Compendium of Materia Medica" records: "Tea oil is cool in nature, has the effects of cooling blood, stopping bleeding, clearing away heat, and detoxifying. According to the "Dictionary of Chinese and Foreign Medicine", tea oil is not only rich in nutrition, but also promotes the secretion of e...

AI Technical Summary

Problems solved by technology

Among them, the mechanical pressing method has long pressing time, low oil yield, many impurities, high labor intensity, low production efficiency, and there is a high-temperature steaming and frying process of the raw body during the oil pressing process. Complex chemical reactions between proteins and fats are prone to occur, resulting in strong carcinogenic benzopyrene, the protein denaturation in tea dry is serious, and the comprehensive utilization rate of oil resources is low; the organic solvent extraction method has long extraction time, low efficiency, large solvent consumption, poor quality of crude oil, contains a certain amount of residual solvent and is easy to Causes a series of problems such as solvent residue in the product; although the cold pressing method avoids the heat treatment process in the traditional pressing method, the tea leaves still contain 5%-10% oil, the extraction is not sufficient, and more complicated refining is still required process; the supercritical fluid extraction method has high requirements for equipment, complex process, small equipment volume, high cost, and high energy consumption, which is not suitable for large-scale industrial continuous production; a patent applied by the Northwest Institute of Plateau Biology, Chinese Academy of Sciences in 2011 "A Method for Subcritical Fluid Extraction of Seabuckthorn Seed Oil" uses a subcritical fluid extraction method to extract seabuckthorn seed oil from seabuckthorn seeds, but there are problems such as long extraction time, large demand for extraction solvent, and inability to operate continuously