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Ultrafiltration membrane for stevia rebaudiana purification and preparation method thereof

A technology of ultrafiltration membrane and stevia, applied in the preparation of sugar derivatives, chemical instruments and methods, membranes, etc., can solve the problems of cumbersome solvent treatment, large solvent consumption of macroporous adsorption resin columns, and easy pollution of filter membranes , to achieve the effect of avoiding the reduction of permeation flux, good separation effect and shortening filtration time

Pending Publication Date: 2021-04-13
安徽鸿昌糖业科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation process of steviol glycosides generally includes steps such as extraction, flocculation and precipitation, adsorption of steviol glycosides by macroporous resin, concentration of desorption liquid, and drying; however, the solvent consumption of macroporous adsorption resin column is large, and the solvent treatment in the later stage is cumbersome and easy to pollute the environment
[0004] At present, a combination of microfiltration, ultrafiltration, and nanofiltration is used to separate and purify stevia. However, the filter membrane is easily polluted during the filtration process, and the dynamic filter cake layer formed on the membrane causes serious concentration difference polarization. , leading to a serious decline in permeation flux, thereby reducing permeation flux, prolonging the filtration time, and increasing the loss rate of stevioside and rebaudioside A in the filtration process, reducing the yield

Method used

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  • Ultrafiltration membrane for stevia rebaudiana purification and preparation method thereof

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Embodiment 1

[0025] An ultrafiltration membrane for stevia purification comprises a metal mesh and a calcium-doped silicon dioxide membrane attached to the surface of the metal mesh.

[0026] The preparation method of the ultrafiltration membrane for the above-mentioned stevia purification comprises the steps of: taking 0.07mol of 1,3-bis(trimethylsiloxy)propane, 0.1mol of tetraethyl orthosilicate, and 0.01mol of calcium chloride , adding 73g of ethanol, stirring at high speed until the solution is clear, then adding 73g of hydrochloric acid aqueous solution with a mass fraction of 0.3wt%, and continuously stirring at room temperature at a speed of 500r / min for 13h to obtain a sol;

[0027] Take a stainless steel mesh with a pore size of 1.5 μm, ultrasonically clean it twice with acetone, ethanol, and water, each time for 10 minutes, and then dry it; evenly coat the sol on the surface of the stainless steel mesh, then sinter at 350°C for 2 hours, and repeat the coating- The sintering step ...

Embodiment 2

[0029] An ultrafiltration membrane for stevia purification comprises a metal mesh and a calcium-doped silicon dioxide membrane attached to the surface of the metal mesh.

[0030] The preparation method of the ultrafiltration membrane for the above-mentioned stevia purification comprises the steps of: taking 0.08mol of 1,3-bis(trimethylsiloxy)propane, 0.1mol of tetraethyl orthosilicate, and 0.005mol of calcium chloride , added to 52g of ethanol, stirred at high speed until the solution was clear, then added 62.5g of hydrochloric acid aqueous solution with a mass fraction of 0.4wt%, and continued to stir at room temperature at a speed of 500r / min for 15h to obtain a sol;

[0031] Take a stainless steel mesh with a pore size of 1.5 μm, ultrasonically clean it twice with acetone, ethanol, and water in sequence, each time for 10 minutes, and then dry it; evenly coat the sol on the surface of the stainless steel mesh, then sinter at 300°C for 2.5 hours, and repeat the coating -Sinte...

Embodiment 3

[0033] An ultrafiltration membrane for stevia purification comprises a metal mesh and a calcium-doped silicon dioxide membrane attached to the surface of the metal mesh.

[0034] The preparation method of the ultrafiltration membrane for the above-mentioned stevia purification comprises the steps of: taking 0.075mol of 1,3-bis(trimethylsiloxy)propane, 0.1mol of tetraethyl orthosilicate, and 0.008mol of calcium chloride , added to 62.5g of ethanol, stirred at high speed until the solution was clear, then added 68g of hydrochloric acid aqueous solution with a mass fraction of 0.35wt%, and continued to stir at room temperature at a speed of 500r / min for 14h to obtain a sol;

[0035] Take a stainless steel mesh with a pore size of 1.5 μm, ultrasonically clean it twice with acetone, ethanol, and water, each time for 10 minutes, and then dry it; evenly coat the sol on the surface of the stainless steel mesh, then sinter at 320°C for 2 hours, and repeat the coating- The sintering ste...

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Abstract

The invention discloses an ultrafiltration membrane for stevia rebaudiana purification. The ultrafiltration membrane comprises a metal net and a calcium-doped silicon dioxide membrane attached to the surface of the metal net. The invention also provides a preparation method of the ultrafiltration membrane for stevia rebaudiana purification, which comprises the following steps: dissolving 1, 3-bis (trimethylsiloxy) propane, tetraethoxysilane and calcium chloride in ethanol, adding a hydrochloric acid water solution, and continuously stirring to obtain sol; and uniformly coating the sol on the surface of a metal net, sintering, and repeating the coating and sintering steps to finally obtain the ultrafiltration membrane. The method has a good separation effect, and the yield of stevioside and rebaudioside A can be increased.

Description

technical field [0001] The invention relates to the technical field of stevia purification, in particular to an ultrafiltration membrane for stevia purification and a preparation method thereof. Background technique [0002] Steviol glycosides in stevia leaf extract are the main components of sweeteners. Steviol glycosides are produced as white powder, which has the advantages of low calorie and high sweetness, and is one of the raw materials for food and pharmaceutical industries. [0003] At present, the research on the separation and purification of stevia is mainly based on resin adsorption separation. The principle is to use the high adsorption selectivity of macroporous adsorption resins for steviol glycosides to decolorize and purify them. The preparation process of steviol glycosides generally includes steps such as extraction, flocculation and precipitation, adsorption of steviol glycosides by macroporous resin, concentration of desorption liquid, and drying; howev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/02B01D69/02B01D67/00C07H15/256C07H1/06C07H1/08
CPCB01D71/027B01D67/0039B01D69/02C07H15/256C07H1/06C07H1/08B01D2325/36B01D2323/02
Inventor 周大钊
Owner 安徽鸿昌糖业科技有限公司
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