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Extraction method of stevioside based on membrane method

A technology of stevioside and extraction method, which is applied in the field of stevioside preparation, can solve the problems of low stevioside extraction process yield, heavy environmental pollution, and low product purity, and achieve excellent high-permeability low-molecular-weight organic and inorganic substances Salt, good pollution resistance, good anti-pollution effect

Inactive Publication Date: 2011-10-26
安徽普朗膜技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for extracting stevioside based on the membrane method, in order to solve the problems of low yield and low product purity of the existing stevioside extraction process, especially to solve the problem of high production cost and environmental pollution of the conventional extraction process. heavy pollution problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] First, stevia leaves are leached, and the extracted liquid is separated and treated at 80 mesh to obtain the permeate; the permeate is put into the continuous backwash organic tubular microfiltration membrane or ultrafiltration membrane for fine filtration, and the diameter of the tubular membrane channel is selected 3mm, the membrane pore diameter is 0.2 micron membrane element, the operating pressure is 1Bar-8Bar, the backwash pressure is 0.2Bar, the backwash frequency is 1 time / 1 hour, and the filtrate is obtained;

[0022] Then the filtrate obtained by continuous backwashing organic tubular microfiltration membrane or ultrafiltration membrane is concentrated and dehydrated by nanofiltration membrane, salt permeation, and some small molecular impurities are permeated. The pressure is 5Bar, and the concentrated solution obtained through the nanofiltration membrane is concentrated 20 times, the salt is removed by more than 90%, and the loss of sugar solution is less tha...

Embodiment 2

[0028] First, stevia leaves are leached, and the extracted liquid is separated and treated at 140 mesh to obtain the permeate; the permeate is put into the continuous backwash organic tubular microfiltration membrane or ultrafiltration membrane for fine filtration, and the diameter of the tubular membrane channel is selected 9mm, the membrane pore diameter is 0.05 micron membrane element, the operating pressure is 5Bar, the backwash pressure is 1Bar, the backwash frequency is 1 time / 1.5 hours, and the filtrate is obtained;

[0029] Then the filtrate obtained by continuous backwashing organic tubular microfiltration membrane or ultrafiltration membrane is concentrated and dehydrated by nanofiltration membrane, salt permeation, and some small molecular impurities are permeated. The pressure is 15Bar, and the concentrated solution obtained through the nanofiltration membrane is concentrated 30 times, the salt is removed by more than 90%, and the loss of sugar solution is less than...

Embodiment 3

[0035] First, stevia leaves are leached, and the extracted liquid is separated and treated at 200 mesh to obtain the permeate; the permeate is put into the continuous backwashable organic tubular microfiltration membrane or ultrafiltration membrane for fine filtration, and the diameter of the tubular membrane channel is selected 15mm, the membrane pore diameter is selected from membrane elements with a molecular weight cut-off of 10000DALTON, the operating pressure is 8Bar, the backwash pressure is 2Bar, and the backwash frequency is 1 time / 2 hours to obtain the filtrate;

[0036] Then the filtrate obtained by continuous backwashing organic tubular microfiltration membrane or ultrafiltration membrane is concentrated and dehydrated by nanofiltration membrane, salt permeation, and some small molecular impurities are permeated. The pressure is 25Bar, and the concentrated solution obtained through the nanofiltration membrane is concentrated 40 times, the salt is removed by more tha...

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Abstract

The invention belongs to the field of stevioside preparation, and in particular relates to an extraction method of stevioside based on a membrane method. The method comprises the following steps: firstly, carrying out rough treatment on stevioside leach liquor so as to obtain a penetrating liquid; filtering the penetrating liquid with a tubular microfiltration membrane or ultrafiltration membrane so as to obtain filtrate; filtering the filtrate with a nanofiltration membrane so as to obtain a concentrated liquid; filtering produced water obtained by nanofiltration membrane filtration excluding the concentrated liquid with a reverse osmosis membrane, reusing the filtered produced water to a stevioside leaching process or a resin absorption process so as to carry out top washing on a resin column, and outwardly discharging after the concentrated liquid obtained by reverse osmosis membrane filtration is qualified by treatment; and finally, filtering the concentrated liquid with the ultrafiltration membrane so as to obtain a transmission liquid, and purifying the transmission liquid in the resin absorption process so as to obtain the stevioside. By using the method, the problems that the yield is low and the purity of the product is low in the existing stevioside extraction process are solved, and especially, the problems that production cost is high and environmental pollution is severe in the conventional extraction process are solved.

Description

technical field [0001] The invention belongs to the field of preparation of stevioside, and in particular relates to a method for extracting stevioside based on a membrane method. Background technique [0002] With the continuous expansion of the production scale of stevioside products by extracting stevia rebaudiana, the country's increasingly strict requirements on food additives and the increasing awareness of environmental protection, the traditional stevioside production process usually requires the extraction of stevioside. flocculation, because in the flocculation process, the stevioside extract has a long residence time and is easy to infect bacteria. In order to ensure the stable production, a large amount of flocculants and preservatives should be added in the flocculation process, which not only increases the production cost, but also increases the production cost. Moreover, the processing difficulty of the follow-up process is improved; at the same time, the trad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07H15/256C07H1/08
Inventor 俞经福
Owner 安徽普朗膜技术有限公司
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