Method for extracting residual oil and tea saponin from tea seed cake after oil extraction

Abstract

The invention relates to a method for extracting raffinate oil and tea saponin from tea seed cake after oil extraction, which belongs to the field of grain and oil processing and byproduct extracting techniques. The technique of the invention mainly comprises the processes: after the extracted tea seek cake is crashed and dried, the raffinate oil is extracted by using industrial hexane or sherwood oil, the extracted raffinate oil is distilled to remove the solvent so as to obtain crude oil; the distilled solvent can be recycled, the tea seed cake after the raffinate oil is adopted to leach tea saponin by 85 to 95 percent ethanol, the tea saponin is subjected to the water bath heat and reflux for 2 to 3 hours at a temperature of between 70 and 80 DEG C, the tea saponin concentrated solution is obtained after filtering, distilling and concentrating processes, the depigmentation treatment is performed by using active carbon or 35 percent H2O2, and certain mount of acetone is added to the processed solution to keep stand for 1 to 2 hours; and after the tea saponin separates out completely, and the product of tea saponin is obtained by filtering and drying processes.

Description

technical field [0001] The invention relates to a method for extracting residual oil and tea saponin from tea seed cake after oil pressing, and belongs to the field of grain and oil processing and extraction of by-products. Background technique [0002] Camellia oleifera is a unique woody edible oil tree species in my country, and it is also one of the four largest woody edible oil source tree species in the world. Tea seed oil is "the only edible oil comparable to olive oil and one of the healthiest in the world". Tea seeds contain 26% to 39% oil. According to rough statistics, the current national annual output of tea seeds is about 1.2 million tons, but the annual output of crude tea oil is only 150,000 to 180,000 tons. The tea seed cake widely used at present after pressing and extracting oil generally has a residual oil content of 5% to 9%. [0003] The tea seed cake after oil extraction from tea seeds contains about 10% to 15% tea saponin, and the tea seed meal after...

AI Technical Summary

Problems solved by technology

[0005] At present, the conventional tea saponin extraction method is water extraction method, the tea saponin obtained by this method has low purity, contains many water-soluble impurities, and is dark brown in color. During the extraction process, water makes a large amount of starch in tea seeds gelatinize, Colloidalization of protein makes solid-liquid separation difficult, and the product is highly water-absorbing and viscous, requiring a high drying temperature, which will often cause tea saponin to deteriorate and decompose, and the color will deepen. The effect of this method is not good.