The invention relates to a method for purifying
sodium aescinate. The method comprises the steps of crushing Chinese buckeye seed, adding 80-95%
ethanol with amount of 5-10 times than that of the Chinese buckeye seed to carry out circumfluence extraction for 2 to 3 times, pressure-reducing the extraction liquid, recycling the
ethanol, dispersing and filtering
mother liquor by adding right amount of water, adding
macroporous resin columns for absorption, eluting by using 50-70%
ethanol solution with 4-6 BV, collecting the eluting liquid, pressure-reducing and recycling the ethanol, adding cation exchange resin columns into concentrated solution, adjusting the pH (potential of
hydrogen) value of the lower resin column liquid to be 7.5-8.5, adding the
macroporous resin columns again for absorption, adding
acetone solution into the lower column liquid, mixing fully to obtain
precipitation, dissolving the precipitate by using the ethanol solution, shortening the column by using
peroxide aluminum, pressure-reducing the column filtering liquid, recycling the ethanol to be in a small volume, placing for
crystallization, carrying out circumfluence dissolving on
crystallization products by using the ethanol solution and re-crystallizing for 1-3 times, and
drying the
crystallization products to obtain
sodium aescinate products with content not less than 95%. By using the method for purifying
sodium aescinate to produce the
sodium aescinate, the process is simple, the operation is easy, the content of obtained products is high, and the method can be directly used on
medicine production.