Method for extracting stevia rebaudiana sugar by using mixed flocculant

Abstract

The invention relates to a method for extracting stevia rebaudiana sugar by using a mixed flocculant. The method comprises the following steps of: soaking stevia rebaudiana leaves in clear water, extracting for four times, and extracting the stevia rebaudiana sugar by adding flocculants which are required to be diluted first and then are added, namely heating extracting solution of the stevia rebaudiana sugar, adding solution of the flocculant A and stirring, adding saturated solution of the flocculant B and stirring, adding lime water to regulate the pH value of the mixed flocculant to be between 9 and 9.5, stirring, standing for 10 minutes, injecting the obtained solution into a plate and frame filter for filtration, loading filtrate on an adsorption column for absorption, analyzing, desalinizing and decolorizing analytical liquid, concentrating the desalinized and decolorized analytical liquid until certain concentration is obtained, and spray-drying. The organic and inorganic mixed flocculant is used to replace a pure inorganic salt flocculant, the formula is simple, the cost is reduced, flocculation effect is strengthened and the purity of the stevia rebaudiana sugar is improved; compared with an inorganic salt flocculation method, the method has the advantage that: the content of total glucosides is improved from 80-85 percent to 90 percent; and the method is easy to operate and is favorable for promotion.

Description

technical field [0001] The invention relates to the technical field of flocculation for extracting stevia sugar, in particular to a method for extracting stevia sugar with a mixed flocculant. Background technique [0002] Flocculation is one of the processes in the extraction of stevia sugar, which can remove macromolecular impurities such as pectin and protein during the extraction process of stevia sugar, and improve the purity of stevia sugar. [0003] The flocculants of existing stevia sugar at home and abroad are all inorganic salts, and iron salts are mainly used in production. The purity of stevia sugar also affects the adsorption capacity and regeneration capacity of the adsorption resin. This kind of flocculant is precipitated with lime water, which increases the load of the desalination resin and increases the production cost. Contents of the invention [0004] The purpose of the present invention aims at the defects and deficiencies of the flocculation process ...

AI Technical Summary

Problems solved by technology

[0003] The flocculants of existing stevia sugar at home and abroad are all inorganic salts, and iron salts are mainly used in production. The purity of stevia sugar also affects the adsorption capacity and regeneration capacity of the adsorption resin. This kind of flocculant is precipitated with lime water, which increases the load of the desalination resin and increases the production cost.