The invention discloses a method for preparing tea
saponin by using tea seed degreased dregs, which comprises the following process steps of: firstly extracting by using high-concentration aqueous
methanol, recovering
methanol from an extraction liquid to prepare coarse tea
saponin pasty liquid, and then purifying by adopting a three-purification method.
Chitosan is used as a flocculating agent in the first purification to filter and remove partial impurities; a
calcium hydroxide emulsion is used as a precipitating agent in the second purification, so that the tea
saponin is converted into tea saponin
calcium to be precipitated and separated from the water-soluble impurities, then the tea saponin
calcium is converted into the tea saponin to be dissolved in water by using
ammonium hydrogencarbonate, the impurities are further removed through
filtration, then 30%
hydrogen peroxide is used for decoloring, and the finished product of the tea saponin is prepared finally through
spray drying. A
solid obtained after separating and recovering the
methanol from a methanol-contained
solid obtained after extraction can be used as
livestock feed. The invention has the advantages that the method has high obtainment ratio of the tea saponin, low
energy consumption, simple process, convenient operation, high quality of the produced finished product of the tea saponin and wide application range.