Reutilization device of stevia mother liquor sugar

Abstract

The utility model discloses a reutilization device of stevia mother liquor sugar. The reutilization device comprises a mother liquor sugar solution storage tank, a simulated moving bed chromatographic separation system, a reverse osmosis system, an acidification tank, a plate and frame filter, a first drying tank and a rebaudioside B storage tank which are communicated with one another, an organic phase outlet of the simulated moving bed chromatographic separation system is sequentially communicated with a concentration tank, a second drying tank and a stevioside storage tank; and a permeate outlet of the reverse osmosis system is communicated with a moving phase inlet of the simulated moving bed chromatographic separation system. According to the device, the stevia mother liquor sugar solution is sequentially subjected to simulated moving bed chromatographic separation, reverse osmosis treatment and acidification treatment to obtain a high-content first product rebaudioside B, other stevioside in the process is also recycled, waste liquid is also effectively utilized, the economic value of the stevia mother liquor sugar is improved, and the energy consumption is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of steviol glycoside production, in particular to a stevia mother liquor sugar recycling device. Background Art

[0002] Steviosides are a class of natural sweeteners extracted from the stevia leaf. Based on the position and number of glucose groups on their side chains, they can be divided into over 60 types, including rubusoside, stevioside, rebaudioside A, rebaudioside B, and rebaudioside C. These compounds possess a high sweetness without caloric or blood sugar-raising effects, making them considered ideal natural sweeteners. At least a dozen different types of steviol glycosides have been discovered, with the four most prominent being rebaudioside A, rebaudioside C, stevioside, and dulcoside A. These different types of steviol glycosides are structurally formed by linking the basic unit glucose in varying numbers and positions. Rebaudioside A is approximately 300 to 450 times sweeter than sucrose, has no bitterness, and tastes similar to sucrose, making it a premium stevioside. Currently, rebaudioside A is primarily extracted from plants. The extraction process inevitably produces a portion of stevia mother liquor sugars, which have a low total glycoside content, a poor taste, and low economic value. Direct disposal of this sugars wastes resources. Therefore, effectively processing the stevia mother liquor sugars used to produce rebaudioside A has become a pressing issue for those skilled in the art. Utility Model Content

[0003] The technical problem to be solved by the utility model is: in view of the deficiencies in the existing technology, a device for recycling stevia mother liquor sugar is provided, which sequentially subjects the stevia mother liquor sugar solution to simulated moving bed chromatography separation, reverse osmosis treatment and acid precipitation treatment to obtain a high-content first product, rebaudioside B, and other steviol glycosides in the process are also recovered, and waste liquid is also effectively utilized, thereby increasing the economic value of stevia mother liquor sugar and reducing energy consumption.

[0004] In order to solve the above technical problems, the technical solution of the utility model is:

[0005] A device for recycling stevia mother liquor sugar comprises a connected mother liquor sugar solution storage tank, a simulated moving bed chromatography separation system, a reverse osmosis system, an acid precipitation tank, a plate and frame filter, a first drying tank, and a rebaudioside B storage tank; the organic phase outlet of the simulated moving bed is sequentially connected to a concentration tank, a second drying tank, and a steviol glycoside storage tank; the permeate outlet of the reverse osmosis system is connected to a mobile phase inlet of the simulated moving bed chromatography separation system.

[0006] Preferably, the mother sugar solution storage tank is also connected to an alkali solution storage tank.

[0007] Preferably, the simulated moving bed chromatography separation system comprises six chromatography columns connected in series and end to end, and all six chromatography columns are filled with cationic chromatography resin.

[0008] Preferably, the mobile phase inlet of the simulated moving bed chromatography separation system is connected to a pure water storage tank, and a first pneumatic diaphragm pump is provided on the connecting pipe between the pure water storage tank and the mobile phase inlet.

[0009] Preferably, a second pneumatic diaphragm pump is provided on the connecting pipe between the mother sugar solution storage tank and the feed liquid inlet of the simulated moving bed chromatography separation system.

[0010] Preferably, a third pneumatic diaphragm pump is provided on the connecting pipe between the organic salt phase outlet of the simulated moving bed chromatography separation system and the reverse osmosis system, and a fourth pneumatic diaphragm pump is provided on the connecting pipe between the organic phase outlet of the simulated moving bed chromatography separation system and the concentration tank.

[0011] Preferably, the effluent of the tail chromatographic column connected in series with the simulated moving bed chromatographic separation system is communicated with the mobile phase inlet of the simulated moving bed chromatographic separation system through a circulation pipeline, and a fifth pneumatic diaphragm pump is provided on the circulation pipeline.

[0012] Preferably, the acid precipitation tank is connected to an acid liquid storage tank.

[0013] Due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0014] The utility model provides a stevia mother liquor sugar recycling device, comprising a connected mother liquor sugar solution storage tank, a simulated moving bed chromatography separation system, a reverse osmosis system, an acid precipitation tank, a plate and frame filter, a first drying tank, and a rebaudioside B storage tank. By subjecting the mother liquor sugar solution to simulated moving bed chromatography separation, reverse osmosis treatment, and acid precipitation precipitation treatment, the rebaudioside B product in the mother liquor sugar solution is recovered, thereby increasing the economic value of the stevia mother liquor sugar.

[0015] The organic phase outlet of the simulated moving bed of this device is connected in sequence to the concentration tank, the second drying tank and the steviol glycoside storage tank; the organic phase contains steviol glycosides other than rebaudioside B, which are recovered in the steviol glycoside storage tank after concentration and drying, further improving the utilization rate of stevia mother liquor sugar.

[0016] The permeate outlet of the reverse osmosis system of the device is connected to the mobile phase inlet of the simulated moving bed chromatographic separation system, and the permeate in the reverse osmosis system is recycled, which reduces the amount of waste liquid discharged and is energy-saving and environmentally friendly.

[0017] The mobile phase inlet of the simulated moving bed chromatographic separation system of the device is connected to a pure water storage tank, and a first pneumatic diaphragm pump is provided on the connecting pipe between the pure water storage tank and the mobile phase inlet; a second pneumatic diaphragm pump is provided on the connecting pipe between the mother liquor sugar solution storage tank and the feed liquid inlet of the simulated moving bed chromatographic separation system; a third pneumatic diaphragm pump is provided on the connecting pipe between the organic salt phase outlet of the simulated moving bed chromatographic separation system and the reverse osmosis system, and a fourth pneumatic diaphragm pump is provided on the connecting pipe between the organic phase outlet of the simulated moving bed chromatographic separation system and the concentration tank. The first pneumatic diaphragm pump, the second pneumatic diaphragm pump, the third pneumatic diaphragm pump and the fourth pneumatic diaphragm pump can accurately control the pure water flow rate, the feed liquid flow rate, the organic salt phase flow rate and the organic phase flow rate, thereby improving the separation effect.

[0018] This device simulates a moving bed chromatographic separation system in series, where the effluent from the tail column is connected to the mobile phase inlet of the system via a circulation pipeline equipped with a fifth pneumatic diaphragm pump. Using the effluent from the simulated chromatographic separation system to circulate and flush the chromatographic column not only improves separation efficiency but also enables the recycling of waste liquid and reduces energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

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

[0021] In the figure, 1. mother liquor sugar solution storage tank; 2. simulated moving bed chromatography separation system; 3. reverse osmosis system; 4. acid precipitation tank; 5. plate and frame filter; 6. first drying tank; 7. rebaudioside B storage tank; 8. alkali solution storage tank; 9. chromatography column; 10. concentration tank; 11. second drying tank; 12. stevioside storage tank; 13. pure water storage tank; 14. first pneumatic diaphragm pump; 15. second pneumatic diaphragm pump; 16. third pneumatic diaphragm pump; 17. fourth pneumatic diaphragm pump; 18. circulation pipeline; 19. fifth pneumatic diaphragm pump; 20. acid solution storage tank. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0023] Example 1

[0024] like Figure 1 As shown, a stevia mother liquor sugar recycling device includes a connected mother liquor sugar solution storage tank 1, a simulated moving bed chromatography separation system 2, a reverse osmosis system 3, an acid precipitation tank 4, a plate and frame filter 5, a first drying tank 6, and a rebaudioside B storage tank 7;

[0025] The mother liquid sugar solution storage tank 1 is also connected to an alkali solution storage tank 8. Stevia mother liquid sugar is mixed and dissolved with pure water in the mother liquid sugar solution storage tank 1, and the pH of the stevia mother liquid sugar solution is adjusted by the alkali solution in the alkali solution storage tank 8.

[0026] The simulated moving bed chromatography separation system 2 includes six chromatography columns 9 connected in series and end-to-end, each filled with a cationic chromatography resin. The organic phase outlet of the simulated moving bed chromatography separation system 2 is sequentially connected to a concentration tank 10, a second drying tank 11, and a steviol glycoside storage tank 12. The mobile phase inlet of the simulated moving bed chromatography separation system 2 is connected to a pure water storage tank 13, and a first pneumatic diaphragm pump 14 is provided in the pipe connecting the pure water storage tank 13 and the mobile phase inlet. The mother liquor sugar solution storage tank 1 is connected to the feed liquid inlet of the simulated moving bed chromatography separation system 2, and a second pneumatic diaphragm pump 15 is provided in the pipe connecting the mother liquor sugar solution storage tank 1 and the feed liquid inlet of the simulated moving bed chromatography separation system 2. A third pneumatic diaphragm pump 16 is provided in the pipe connecting the organic salt phase outlet of the simulated moving bed chromatography separation system 2 to the reverse osmosis system 3, and a fourth pneumatic diaphragm pump 17 is provided in the pipe connecting the organic phase outlet of the simulated moving bed chromatography separation system 2 to the concentration tank 10.

[0027] Furthermore, the effluent of the tail chromatographic column connected in series with the simulated moving bed chromatographic separation system 2 is communicated with the mobile phase inlet of the simulated moving bed chromatographic separation system 2 through a circulation pipe 18 , and a fifth pneumatic diaphragm pump 19 is provided on the circulation pipe 18 .

[0028] Based on the above scheme, the first, second, third, and fourth pneumatic diaphragm pumps 14, 15, 16, and 17 are used to control the flow rates of pure water, feed liquid, organic salt phase, and organic phase, respectively, significantly improving the separation effect. The organic phase separated in the simulated moving bed chromatography separation system 2 is dried in the second drying tank 11, and the remaining steviol glycosides are stored in the steviol glycoside storage tank 12.

[0029] The organic salt phase outlet of the simulated moving bed chromatography separation system 2 is connected to the reverse osmosis system 3. The permeate outlet of the reverse osmosis system 3 is connected to the mobile phase inlet of the simulated moving bed chromatography separation system 2. The organic salt phase contains rebaudioside B, which enters the reverse osmosis membrane system for concentration and separation. The permeate after concentration and separation can be used as the mobile phase in the simulated moving bed chromatography separation system 2. The rebaudioside B in the retentate enters the acid precipitation tank 4 for further treatment.

[0030] The acid precipitation tank 4 is connected to the acid liquid storage tank 20. The acid liquid in the acid liquid storage tank 20 is used to adjust the pH of the intercepted liquid in the acid precipitation tank 4, so that rebaudioside B can be better precipitated. The filtered precipitate is dried in the first drying tank 6, and the obtained rebaudioside B product enters the rebaudioside B storage tank 7.

[0031] The process of treating stevia mother liquor sugar using the above device is as follows:

[0032] Stevia mother liquor sugar and water are added to the mother liquor sugar solution storage tank 1. Alkali is added to the stevia mother liquor sugar solution through the alkali storage tank 8 to adjust the pH of the solution. The resulting mother liquor sugar solution enters the simulated moving bed chromatography separation system 2 at a certain flow rate and is separated using pure water as the mobile phase. The organic phase separated in the simulated moving bed chromatography separation system 2 enters the concentration tank 10 and the second drying tank 11 in sequence for concentration and drying. The other steviol glycoside products obtained enter the steviol glycoside storage tank 12. The organic salt phase separated by the simulated moving bed chromatography separation system 2 enters the reverse osmosis membrane system for concentration. The permeate after concentration enters the simulated moving bed chromatography separation system 2 as the mobile phase. The retentate after concentration enters the acid precipitation tank 4. Acid is added to the retentate through the acid storage tank 20 to adjust the pH. Then, acid precipitation precipitation is performed at a certain temperature. The precipitated solution is filtered through a plate and frame filter 5. The resulting precipitate enters the first drying tank 6 to obtain the rebaudioside B product, which is then stored in the rebaudioside B storage tank 7.

[0033] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one 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 limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A device for recycling stevia mother liquor sugar, characterized by: The invention comprises a mother liquor sugar solution storage tank, a simulated moving bed chromatography separation system, a reverse osmosis system, an acid precipitation tank, a plate and frame filter, a first drying tank, and a rebaudioside B storage tank, which are connected to each other; the organic phase outlet of the simulated moving bed chromatography separation system is connected to a concentration tank, a second drying tank, and a stevioside storage tank in sequence; the permeate outlet of the reverse osmosis system is connected to a mobile phase inlet of the simulated moving bed chromatography separation system.

2. The stevia mother liquor sugar recycling device according to claim 1, characterized in that: The mother liquor sugar solution storage tank is also connected to an alkali solution storage tank.

3. The stevia mother liquor sugar recycling device according to claim 1, characterized in that: The simulated moving bed chromatographic separation system comprises six chromatographic columns connected in series and end to end, and all six chromatographic columns are filled with cation chromatographic resin.

4. The stevia mother liquor sugar recycling device according to claim 3, characterized in that: The mobile phase inlet of the simulated moving bed chromatographic separation system is connected to a pure water storage tank, and a first pneumatic diaphragm pump is provided on the connecting pipe between the pure water storage tank and the mobile phase inlet.

5. The stevia mother liquor sugar recycling device according to claim 3, characterized in that: A second pneumatic diaphragm pump is provided on the connecting pipe between the mother liquor sugar solution storage tank and the feed liquid inlet of the simulated moving bed chromatography separation system.

6. The stevia mother liquor sugar recycling device according to claim 3, characterized in that: A third pneumatic diaphragm pump is provided on the connecting pipe between the organic salt phase outlet of the simulated moving bed chromatographic separation system and the reverse osmosis system, and a fourth pneumatic diaphragm pump is provided on the connecting pipe between the organic phase outlet of the simulated moving bed chromatographic separation system and the concentration tank.

7. The stevia mother liquor sugar recycling device according to claim 3, characterized in that: The effluent of the tail chromatographic column connected in series with the simulated moving bed chromatographic separation system is communicated with the mobile phase inlet of the simulated moving bed chromatographic separation system through a circulation pipeline, and a fifth pneumatic diaphragm pump is provided on the circulation pipeline.

8. The stevia mother liquor sugar recycling device according to claim 1, characterized in that: The acid precipitation tank is connected to an acid liquid storage tank.

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