A purification system for stevia crystallization mother liquor

Abstract

This invention discloses a purification system for stevia crystallization mother liquor, comprising a connected enzyme reaction vessel, a first resin column, a first vacuum concentration vessel, a hydrolysis vessel, a second resin column, a second vacuum concentration vessel, a spray drying vessel, and a target product storage tank. The inlet of the enzyme reaction vessel is connected to a mother liquor solution storage tank, a β-cyclodextrin solution storage tank, a CGT enzyme storage tank, and a buffer solution storage tank. The inlet of the first resin column is also connected to a water storage tank, a first eluent storage tank, and a second eluent storage tank. The inlet of the hydrolysis vessel is connected to the first eluent outlet of the first resin column, and the inlet of the hydrolysis vessel is also connected to a saccharifying enzyme storage tank. The inlet of the second resin column is connected to a third eluent storage tank. This purification system not only effectively purifies steviol glycosides in the mother liquor but also effectively recovers some of the solvent during the purification process, reducing energy consumption and increasing the economic value of the mother liquor.

Description

Technical Field

[0001] This utility model relates to chemical production equipment, specifically to a purification system for stevia crystallization mother liquor. Background Technology

[0002] Stevia, a natural sweetener with high sweetness and low calories, is widely used in the food, beverage, and pharmaceutical industries. Currently, the production of stevia generates a large amount of crystallization mother liquor, which still contains a significant amount of steviol glycosides and other sugar components. Directly discarding this mother liquor not only wastes resources but also puts pressure on the environment. Therefore, the efficient recovery and purification of stevia crystallization mother liquor has significant economic and environmental value.

[0003] Currently, purification methods for stevia mother liquor mainly include solvent extraction, membrane separation, crystallization, and adsorption resin processes. However, steviol glycosides in stevia mother liquor have small polarity differences with impurities, making it difficult for existing devices to effectively separate them. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a purification system for stevia crystallization mother liquor, which not only effectively purifies steviol glycosides in the mother liquor, but also effectively recovers some of the solvent in the purification process, reducing energy consumption and improving the economic value of the mother liquor.

[0005] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:

[0006] A purification system for stevia crystallization mother liquor includes a connected enzyme reaction vessel, a first resin column, a first vacuum concentration vessel, a hydrolysis vessel, a second resin column, a second vacuum concentration vessel, a spray drying vessel, and a target product storage tank.

[0007] The inlet of the enzyme reaction vessel is connected to the mother liquor sugar solution storage tank, the β-cyclodextrin solution storage tank, the CGT enzyme storage tank, and the buffer storage tank, respectively; the inlet of the first resin column is also connected to the water storage tank, the first eluent storage tank, and the second eluent storage tank, respectively; the inlet of the hydrolysis vessel is connected to the first eluent outlet of the first resin column, and the inlet of the hydrolysis vessel is also connected to the saccharifying enzyme storage tank; the inlet of the second resin column is connected to the third eluent storage tank.

[0008] Preferably, a preheater is provided on the connecting pipes of the mother liquor sugar solution storage tank, the β-cyclodextrin solution storage tank and the enzyme reaction tank.

[0009] Preferably, the enzyme reaction vessel is equipped with a temperature sensor and a pH sensor, and an electric valve is provided on the connecting pipe between the enzyme reaction vessel and the buffer storage tank. The pH sensor is interlocked with the electric valve.

[0010] Preferably, a first buffer tank is provided on the connecting pipe between the enzyme reaction vessel and the first resin column, and the inlet of the first buffer tank is also connected to an ethanol storage tank.

[0011] Preferably, the gas outlet of the first vacuum concentrator is connected in sequence to the first condenser and the first ethanol recovery tank; the gas outlet of the second vacuum concentrator is connected in sequence to the second condenser and the second ethanol recovery tank.

[0012] Preferably, a second buffer tank is also provided on the connecting pipe between the hydrolysis tank and the second resin column, and the inlet of the second buffer tank is connected to the ethanol storage tank.

[0013] Preferably, the effluent outlet of the first resin column, the second eluent outlet, and the top water outlet are connected to waste liquid storage tank one; the effluent outlet of the second resin column is connected to waste liquid storage tank two.

[0014] By adopting the above technical solution, this utility model has at least the following beneficial effects:

[0015] This invention provides a purification system for stevia crystallization mother liquor. This purification system combines the high selectivity of bio-enzymatic methods, the efficient separation of resin adsorption, and the stability of physical concentration and drying to effectively separate steviol glycosides from the crystalline mother liquor.

[0016] This purification system first performs enzymatic glycosylation modification on specific components in the mother liquor sugar in an enzyme reaction vessel to increase the polarity of steviol glycosides and impurities. Then, it passes through a first resin column to remove unreacted glucose residues and other impurities. The separated enzymatically modified target product is hydrolyzed under the action of a saccharifying enzyme to convert glucosyl steviol glycosides into steviol glycosides without glucose residues. Subsequently, it is purified by a second resin column to remove glucose residues, yielding high-purity steviol glycosides.

[0017] The pH sensor in the enzyme reaction vessel of this purification system is interlocked with the electric valve, thereby better maintaining the stability of the pH value of the reaction system, ensuring that the enzyme is always in the highest activity state, thus improving reaction efficiency and product yield, reducing human operation error, and ensuring batch-to-batch stability.

[0018] The gas outlets of the first and second vacuum concentration tanks of this purification system are connected to a condenser and an ethanol recovery tank, which allows a large amount of ethanol vapor volatilized during the concentration process to be condensed and recovered, and can be recycled for use in the resin column desorption process. This greatly reduces solvent consumption costs and reduces the discharge of organic waste liquid, meeting the requirements of green production. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model;

[0021] In the diagram, 1. Enzyme reaction vessel; 2. First resin column; 3. First vacuum concentration vessel; 4. Hydrolysis vessel; 5. Second resin column; 6. Second vacuum concentration vessel; 7. Spray drying vessel; 8. Target product storage tank; 9. Mother liquor sugar solution storage tank; 10. β-cyclodextrin solution storage tank; 11. CGT enzyme storage tank; 12. Buffer storage tank; 13. Water storage tank; 14. First eluent storage tank; 15. Second eluent storage tank; 16. Saccharifying enzyme storage tank; 17. Third eluent storage tank; 18. Preheater; 19. Temperature sensor; 20. pH sensor; 21. Electric valve; 22. First buffer tank; 23. Ethanol storage tank one; 24. Second buffer tank; 25. Ethanol storage tank two; 26. First condenser; 27. Ethanol recovery tank one; 28. Second condenser; 29. ​​Ethanol recovery tank two; 30. Waste liquid storage tank one; 31. Waste liquid storage tank two. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Example

[0024] like Figure 1 As shown, a purification system for stevia crystallization mother liquor includes an enzyme reaction tank 1, a first resin column 2, a first vacuum concentration tank 3, a hydrolysis tank 4, a second resin column 5, a second vacuum concentration tank 6, a spray drying tank 7, and a target product storage tank 8, all connected together.

[0025] The inlet of the enzyme reaction vessel 1 is connected to the mother liquor sugar solution storage tank 9, the β-cyclodextrin solution storage tank 10, the CGT enzyme storage tank 11, and the buffer solution storage tank 12, respectively. The inlet of the first resin column 2 is also connected to the water storage tank 13, the first eluent storage tank 14, and the second eluent storage tank 15, respectively. The inlet of the hydrolysis vessel 4 is connected to the first eluent outlet of the first resin column 2, and the inlet of the hydrolysis vessel 4 is also connected to the saccharifying enzyme storage tank 16. The inlet of the second resin column 5 is connected to the third eluent storage tank 17. A preheater 18 is provided on the connecting pipes between the mother liquor sugar solution storage tank 9, the β-cyclodextrin solution storage tank 10, and the enzyme reaction vessel 1.

[0026] This purification system uses an enzyme reaction vessel 1, a first resin column 2, a hydrolysis vessel 4, and a second resin column 5. First, it converts steviol glycosides in the mother liquor sugar into glucosyl steviol glycosides, increasing the polarity difference between the effective substances and impurities in the mother liquor sugar. This allows the effective substances in the mother liquor sugar to be effectively separated by the first resin column 2. Then, the glucosyl steviol glycosides are converted into ungrafted glucose residues in the hydrolysis vessel 4 to obtain steviol glycosides. Finally, the glucose residues are removed by the second resin column 5, achieving highly efficient removal of steviol glycosides from the mother liquor sugar.

[0027] In this embodiment, the enzyme reaction vessel 1 is equipped with a temperature sensor 19 and a pH sensor 20. An electric valve 21 is provided on the connecting pipe between the enzyme reaction vessel 1 and the buffer storage tank 12. The pH sensor 20 is interlocked with the electric valve 21.

[0028] In this embodiment, a first buffer tank 22 is provided on the connecting pipe between the enzyme reaction vessel 1 and the first resin column 2, and the inlet of the first buffer tank 22 is also connected to an ethanol storage tank 23. A second buffer tank 24 is also provided on the connecting pipe between the hydrolysis vessel 4 and the second resin column 5, and the inlet of the second buffer tank 24 is connected to an ethanol storage tank 25.

[0029] In this embodiment, the gas outlet of the first vacuum concentration tank 3 is sequentially connected to the first condenser 26 and the ethanol recovery tank 27; the gas outlet of the second vacuum concentration tank 6 is sequentially connected to the second condenser 28 and the ethanol recovery tank 29. This purification system, through the first vacuum concentration tank 3, the second vacuum concentration tank 6, the first condenser 26, and the second condenser 28, realizes the recovery and utilization of ethanol solvent, significantly reducing solvent consumption and production costs.

[0030] In this embodiment, the effluent outlet, the second eluent outlet, and the water top liquid outlet of the first resin column 2 are connected to the waste liquid storage tank 30; the effluent outlet of the second resin column 5 is connected to the waste liquid storage tank 31.

[0031] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A purification system for stevia crystallization mother liquor, characterized in that: It includes a connected enzyme reaction vessel, a first resin column, a first vacuum concentration vessel, a hydrolysis vessel, a second resin column, a second vacuum concentration vessel, a spray drying vessel, and a target product storage tank; The inlet of the enzyme reaction vessel is connected to the mother liquor sugar solution storage tank, the β-cyclodextrin solution storage tank, the CGT enzyme storage tank, and the buffer storage tank, respectively; the inlet of the first resin column is also connected to the water storage tank, the first eluent storage tank, and the second eluent storage tank, respectively; the inlet of the hydrolysis vessel is connected to the first eluent outlet of the first resin column, and the inlet of the hydrolysis vessel is also connected to the saccharifying enzyme storage tank; the inlet of the second resin column is connected to the third eluent storage tank.

2. The purification system for stevia crystallization mother liquor according to claim 1, characterized in that: Preheaters are installed on the connecting pipes between the mother liquor sugar solution storage tank, the β-cyclodextrin solution storage tank and the enzyme reaction tank.

3. The purification system for stevia crystallization mother liquor according to claim 1, characterized in that: The enzyme reaction vessel is equipped with a temperature sensor and a pH sensor. An electric valve is installed on the connecting pipe between the enzyme reaction vessel and the buffer storage tank. The pH sensor is interlocked with the electric valve.

4. The purification system for stevia crystallization mother liquor according to claim 1, characterized in that: The enzyme reaction vessel is connected to the first resin column via a first buffer tank, and the inlet of the first buffer tank is also connected to an ethanol storage tank.

5. The purification system for stevia crystallization mother liquor according to claim 1, characterized in that: The gas outlet of the first vacuum concentrator is connected in sequence to the first condenser and the first ethanol recovery tank; the gas outlet of the second vacuum concentrator is connected in sequence to the second condenser and the second ethanol recovery tank.

6. The purification system for stevia crystallization mother liquor according to claim 1, characterized in that: A second buffer tank is also provided on the connecting pipe between the hydrolysis tank and the second resin column, and the inlet of the second buffer tank is connected to the ethanol storage tank.

7. The purification system for stevia crystallization mother liquor according to claim 1, characterized in that: The effluent outlet of the first resin column, the effluent outlet of the second eluent, and the water top liquid outlet are connected to waste liquid storage tank one, and the effluent outlet of the second resin column is connected to waste liquid storage tank two.

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