Stevioside extraction and separation device

Abstract

The utility model discloses a stevioside extraction and separation device, and relates to the technical field of stevioside production, an upper outlet of an extraction tower is communicated with a first supergravity bed through a pipeline, and a lower outlet of the first supergravity bed is communicated with a first heater through a pipeline; an outlet of the first heater is communicated with a first circulating pump through a pipeline, and an outlet of the first circulating pump is respectively communicated to the first supergravity bed and the extraction material tank through pipelines. The stevioside feed liquid subjected to resin adsorption and elution enters from the upper part of the extraction tower and is contacted and mixed with the extraction agent entering from the lower part of the extraction tower, the pure phase of the stevioside feed liquid and the extraction agent flow out from the top of the extraction tower and enter the first supergravity bed, and impurities in the stevioside feed liquid are discharged from the bottom of the extraction tower; and the repurification of the stevioside feed liquid is realized. And through extraction and separation, the purity of the product is greatly improved, and the quality of the product is higher.

Description

Technical Field

[0001] The utility model relates to the technical field of steviol glycoside production, in particular to a steviol glycoside extraction and separation device. Background Art

[0002] Stevioside, also known as stevioside, is a glycoside extracted from the leaves of the Asteraceae plant (known as Stevia rebaudiana in my country). Its sweetening properties are composed of stevioside and steviosides A, B, C, D, and E. Stevioside can be extracted from the dried leaves using water, clarified, and crystallized. Three types of stevioside are produced in practice: a crude extract, and products with 50% and 90% purity.

[0003] Chinese patent CN208454856U discloses an apparatus for preparing steviol glycosides, achieving rapid and efficient extraction of steviol glycosides and effective microbial inhibition, significantly reducing water consumption. The separation and concentration drying system combines a plate and frame filter press, a resin adsorption device, a membrane separation device, a freeze concentration device, and a spray dryer for multi-stage physical separation, achieving excellent separation results while minimizing the use of organic solvents. However, the product obtained directly from the eluate after macroporous resin adsorption, after being dried through a ceramic membrane, contains relatively high impurities, resulting in low purity. Summary of the Invention

[0004] The technical problem to be solved by the utility model is: to provide a stevioside extraction and separation device in view of the deficiencies in the prior art, thereby improving the purity of the product.

[0005] In order to solve the above technical problems, the technical solution of the utility model is:

[0006] A steviol glycoside extraction and separation device comprises an extraction tower, wherein the upper inlet of the extraction tower is connected to a stevioside liquid tank via a pipeline, the lower inlet of the extraction tower is connected to an extractant tank via a pipeline, the upper outlet of the extraction tower is connected to a first hypergravity bed via a pipeline, the lower outlet of the first hypergravity bed is connected to a first heater via a pipeline, the outlet of the first heater is connected to a first circulation pump via a pipeline, and the outlet of the first circulation pump is connected to the first hypergravity bed and the extraction material tank respectively via pipelines.

[0007] As an improved technical solution, a first density meter is provided on the pipeline between the first circulation pump and the first hypergravity bed.

[0008] As an improved technical solution, a first automatic regulating valve is provided on the pipeline between the first circulation pump and the extraction material tank, and the first density meter and the first automatic regulating valve are interlocked to a control system.

[0009] As an improved technical solution, the upper gas phase outlet of the first high-gravity bed is connected to the first condenser through a pipeline, the outlet of the first condenser is connected to the first separator through a pipeline, the outlet of the first separator is connected to the first solvent pump, and the outlet of the first solvent pump is connected to the first high-gravity bed and the extractant recovery tank through pipelines respectively.

[0010] As an improved technical solution, a second density meter is provided on the pipeline between the first solvent pump and the first hypergravity bed, and a second automatic regulating valve is provided on the pipeline between the first solvent pump and the extractant recovery tank. The second density meter and the second automatic regulating valve are interlocked to a control system.

[0011] As a preferred technical solution, the outlet of the first circulation pump is connected to the second hypergravity bed through a pipeline, the lower outlet of the second hypergravity bed is connected to the second heater through a pipeline, the outlet of the second heater is connected to the second circulation pump through a pipeline, and the outlet of the second circulation pump is connected to the second hypergravity bed and the extraction material tank respectively through pipelines.

[0012] As a preferred technical solution, a third density meter is provided on the pipeline between the second circulation pump and the second hypergravity bed, and a third automatic regulating valve is provided on the pipeline between the second circulation pump and the extraction material tank. The third density meter and the third automatic regulating valve are interlocked to the control system.

[0013] As a preferred technical solution, the upper gas phase outlet of the second high-gravity bed is connected to the second condenser through a pipeline, the outlet of the second condenser is connected to the second separator through a pipeline, the outlet of the second separator is connected to the second solvent pump, and the outlet of the second solvent pump is connected to the second high-gravity bed and the extractant recovery tank through pipelines respectively.

[0014] As a preferred technical solution, a fourth density meter is provided on the pipeline between the second solvent pump and the second hypergravity bed, and a fourth automatic regulating valve is provided on the pipeline between the second solvent pump and the extractant recovery tank. The fourth density meter and the fourth automatic regulating valve are interlocked to the control system.

[0015] As a preferred technical solution, the bottom outlet of the extraction tower is connected to an extraction residual phase tank through a pipeline.

[0016] Due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0017] The utility model provides a steviol glycoside extraction and separation device, comprising an extraction tower, wherein the upper inlet of the extraction tower is connected to a stevioside liquid tank via a pipeline, the lower inlet of the extraction tower is connected to an extractant tank via a pipeline, the upper outlet of the extraction tower is connected to a first supergravity bed via a pipeline, the lower outlet of the first supergravity bed is connected to a first heater via a pipeline, the outlet of the first heater is connected to a first circulation pump via a pipeline, and the outlet of the first circulation pump is connected to the first supergravity bed and the extraction material tank via pipelines. The stevioside liquid after resin adsorption and elution enters from the upper part of the extraction tower, contacts and mixes with the extractant entering from the lower part of the extraction tower, and the pure phase of the stevioside liquid and the extractant flow out from the top of the extraction tower and enter the first supergravity bed, while impurities in the stevioside liquid are discharged from the bottom of the extraction tower, thereby achieving further purification of the stevioside liquid. The material entering the first hypergravity bed is heated by the first heater and circulated between the first hypergravity beds by the first circulation pump. Ultimately, the extractant is evaporated, and the purified liquid is collected in the extraction tank by the first circulation pump. Through extraction and separation, the purity of the product is greatly improved, and the product quality is higher.

[0018] The utility model provides a first density meter on the pipeline between the first circulation pump and the first hypergravity bed. The first density meter can detect the content of steviol glycosides in the circulating liquid to avoid discharging the extractant into the extraction material tank.

[0019] A first automatic regulating valve is installed on the pipeline between the first circulation pump and the extraction material tank. The first density meter and the first automatic regulating valve are interlocked with a control system. The control system controls the opening and closing of the first automatic regulating valve based on the value of the first density meter to prevent the extraction agent from entering the extraction material tank and affecting the purity of the product.

[0020] The upper gas phase outlet of the first high-gravity bed is connected to a first condenser via a pipeline. The outlet of the first condenser is also connected to a first separator via a pipeline. The outlet of the first separator is also connected to a first solvent pump. The outlet of the first solvent pump is connected to the first high-gravity bed and the extractant recovery tank via pipelines, respectively. After being cooled by the first condenser, the gaseous extractant enters the first separator and is then transported to the first high-gravity bed or the extractant recovery tank via the first solvent pump, thus avoiding waste of extractant.

[0021] A second density meter is installed on the pipeline between the first solvent pump and the first high-gravity bed, and a second automatic regulating valve is installed on the pipeline between the first solvent pump and the extractant recovery tank. The second density meter and the second automatic regulating valve are interlocked with a control system. The control system controls the opening and closing of the second automatic regulating valve based on the value of the second density meter. If the second density meter detects steviol glycosides, the second automatic regulating valve closes, and the first solvent pump recirculates and separates the material. If the second density meter detects extractant, the first solvent pump pumps the material into the extractant recovery tank, thereby improving the purification yield.

[0022] The outlet of the first circulation pump is connected to a second hypergravity bed via a pipeline. The lower outlet of the second hypergravity bed is connected to a second heater via a pipeline. The outlet of the second heater is connected to a second circulation pump via a pipeline. The outlet of the second circulation pump is connected to the second hypergravity bed and the extraction material tank via pipelines. The second hypergravity bed further separates and purifies the material separated in the first hypergravity bed, resulting in a better and more thorough separation between the extractant and steviol glycosides and a higher purity product.

[0023] A third density meter is provided on the pipeline between the second circulation pump and the second hypergravity bed, and a third automatic regulating valve is provided on the pipeline between the second circulation pump and the extraction material tank. The third density meter and the third automatic regulating valve are interlocked with a control system. The control system controls the opening and closing and opening degree of the third automatic regulating valve based on the numerical value of the third density meter to prevent the extractant from entering the extraction material tank and affecting the purity of the product.

[0024] The upper gas phase outlet of the second high-gravity bed is connected to a second condenser via a pipeline. The outlet of the second condenser is also connected to a second separator via a pipeline. The outlet of the second separator is connected to a second solvent pump. The outlet of the second solvent pump is connected to the second high-gravity bed and the extractant recovery tank via pipelines, respectively. After being cooled by the second condenser, the gaseous extractant enters the second separator and is then transported to the second high-gravity bed or the extractant recovery tank by the second solvent pump, thus avoiding waste of extractant.

[0025] A fourth density meter is installed on the pipeline between the second solvent pump and the second high-gravity bed, and a fourth automatic regulating valve is installed on the pipeline between the second solvent pump and the extractant recovery tank. The fourth density meter and the fourth automatic regulating valve are interlocked with a control system. The control system controls the opening and closing of the fourth automatic regulating valve based on the value of the fourth density meter. If the fourth density meter detects steviol glycoside, the fourth automatic regulating valve closes, and the second solvent pump recirculates and separates again. If the fourth density meter detects extractant, the second solvent pump pumps the material into the extractant recovery tank, thereby improving the purification yield.

[0026] The bottom outlet of the extraction tower is connected to the extraction residual phase tank through a pipeline to discharge the impurities, and the tail gas generated by the first separator and the second separator is emptied by a vacuum pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0028] Figure 1 It is a structural schematic diagram of an embodiment of the utility model;

[0029] Wherein: 1. extraction tower; 2. stevioside liquid tank; 3. extractant tank; 4. first supergravity bed; 5. first heater; 6. first circulation pump; 7. extraction material tank; 8. first density meter; 9. first automatic regulating valve; 10. first condenser; 11. first separator; 12. first solvent pump; 13. extractant recovery tank; 14. second density meter; 15. second automatic regulating valve; 16. second supergravity bed; 17. second heater; 18. second circulation pump; 19. third density meter; 20. third automatic regulating valve; 21. second condenser; 22. second separator; 23. second solvent pump; 24. fourth density meter; 25. fourth automatic regulating valve; 26. extraction residual phase tank; 27. vacuum pump. DETAILED DESCRIPTION

[0030] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0031] like Figure 1 As shown, a steviol glycoside extraction and separation device includes an extraction tower 1. The upper inlet of the extraction tower 1 is connected to a stevioside liquid tank 2 via a pipeline. The lower inlet of the extraction tower 1 is connected to an extractant tank 3 via a pipeline. The upper outlet of the extraction tower 1 is connected to a first high-gravity bed 4 via a pipeline. The lower outlet of the first high-gravity bed 4 is connected to a first heater 5 via a pipeline. The outlet of the first heater 5 is connected to a first circulation pump 6 via a pipeline. The outlet of the first circulation pump 6 is connected to the first high-gravity bed 4 and the extraction material tank 7 via pipelines. The stevioside liquid after resin adsorption and elution enters the upper part of the extraction tower 1, contacts and mixes with the extractant entering from the lower part of the extraction tower 1. The pure stevioside liquid phase and the extractant flow out from the top of the extraction tower 1 and enter the first high-gravity bed 4, while impurities in the stevioside liquid are discharged from the bottom of the extraction tower 1, achieving further purification of the stevioside liquid. The material entering the first hypergravity bed 4 is heated by the first heater 5 and circulated between the first hypergravity beds 4 by the first circulation pump 6. The extractant is eventually evaporated, and the purified liquid enters the extraction material tank 7 for collection through the first circulation pump 6. Through extraction and separation, the purity of the product is greatly improved, and the product quality is higher.

[0032] A first density meter 8 is provided on the pipeline between the first circulation pump 6 and the first hypergravity bed 4. The first density meter 8 can detect the content of steviol glycosides in the circulating liquid to avoid discharging the extractant into the extraction material tank 7.

[0033] A first automatic regulating valve 9 is installed on the pipeline between the first circulation pump 6 and the extraction material tank 7. The first density meter 8 and the first automatic regulating valve 9 are interlocked with the control system. The control system controls the opening and closing of the first automatic regulating valve 9 based on the value of the first density meter 8 to prevent the extractant from entering the extraction material tank 7 and affecting the purity of the product.

[0034] The upper gas phase outlet of the first high-gravity bed 4 is connected to a first condenser 10 via a pipeline. The outlet of the first condenser 10 is connected to a first separator 11 via a pipeline. The outlet of the first separator 11 is connected to a first solvent pump 12. The outlet of the first solvent pump 12 is respectively connected to the first high-gravity bed 4 and the extractant recovery tank 13 via pipelines. After being cooled by the first condenser 10, the gaseous extractant enters the first separator 11 and is then transported to the first high-gravity bed 4 or the extractant recovery tank 13 by the first solvent pump 12, thereby avoiding waste of the extractant.

[0035] A second density meter 14 is provided on the pipeline between the first solvent pump 12 and the first high-gravity bed 4, and a second automatic regulating valve 15 is provided on the pipeline between the first solvent pump 12 and the extractant recovery tank 13. The second density meter 14 and the second automatic regulating valve 15 are interlocked with a control system. The control system controls the opening and closing of the second automatic regulating valve 15 based on the value of the second density meter 14. If the second density meter 14 detects steviol glycoside, the second automatic regulating valve 15 is closed, and the first solvent pump 12 performs internal circulation and separation again. If the second density meter 14 detects extractant, the first solvent pump 12 pumps the material into the extractant recovery tank 13, thereby improving the purification yield.

[0036] The outlet of the first circulation pump 6 is connected to the second hypergravity bed 16 via a pipeline. The lower outlet of the second hypergravity bed 16 is connected to the second heater 17 via a pipeline. The outlet of the second heater 17 is connected to the second circulation pump 18 via a pipeline. The outlet of the second circulation pump 18 is connected to the second hypergravity bed 16 and the extraction material tank 7 via pipelines. The material separated in the first hypergravity bed 4 is further separated and purified by the second hypergravity bed 16, which improves the separation effect between the extractant and steviol glycosides, makes the separation more thorough, and increases the purity of the product.

[0037] A third density meter 19 is provided on the pipeline between the second circulation pump 18 and the second hypergravity bed 16, and a third automatic regulating valve 20 is provided on the pipeline between the second circulation pump 18 and the extraction material tank 7. The third density meter 19 and the third automatic regulating valve 20 are interlocked with a control system. The control system controls the opening and closing and the opening degree of the third automatic regulating valve 20 based on the value of the third density meter 19 to prevent the extractant from entering the extraction material tank 7 and affecting the purity of the product.

[0038] The upper gas phase outlet of the second high-gravity bed 16 is connected to a second condenser 21 via a pipeline. The outlet of the second condenser 21 is connected to a second separator 22 via a pipeline. The outlet of the second separator 22 is connected to a second solvent pump 23. The outlet of the second solvent pump 23 is connected to the second high-gravity bed 16 and the extractant recovery tank 13 via pipelines. After being cooled by the second condenser 21, the gaseous extractant enters the second separator 22 and is then transported to the second high-gravity bed 16 or the extractant recovery tank 13 by the second solvent pump 23, thereby avoiding waste of extractant.

[0039] A fourth density meter 24 is provided on the pipeline between the second solvent pump 23 and the second high-gravity bed 16, and a fourth automatic regulating valve 25 is provided on the pipeline between the second solvent pump 23 and the extractant recovery tank 13. Both the fourth density meter 24 and the fourth automatic regulating valve 25 are interlocked with a control system. The control system controls the opening and closing of the fourth automatic regulating valve 25 based on the value of the fourth density meter 24. If the fourth density meter 24 detects steviol glycosides, the fourth automatic regulating valve 25 closes, and the second solvent pump 23 performs internal recirculation and separation. If the fourth density meter 24 detects extractant, the second solvent pump 23 pumps the material into the extractant recovery tank 13, thereby improving the purification yield.

[0040] The bottom outlet of the extraction tower 1 is connected to the extraction residual phase tank 26 through a pipeline to discharge the impurities. The tail gas generated by the first separator 11 and the second separator 22 is evacuated through a vacuum pump 27.

[0041] It should be understood that these embodiments are intended only to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the contents of the present invention, those skilled in the art may make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of this application.

Claims

1. A steviol glycoside extraction and separation device, characterized in that: The invention comprises an extraction tower, wherein the upper inlet of the extraction tower is connected to a stevioside liquid tank through a pipeline, the lower inlet of the extraction tower is connected to an extractant tank through a pipeline, the upper outlet of the extraction tower is connected to a first hypergravity bed through a pipeline, the lower outlet of the first hypergravity bed is connected to a first heater through a pipeline, the outlet of the first heater is connected to a first circulation pump through a pipeline, and the outlet of the first circulation pump is connected to the first hypergravity bed and the extraction material tank respectively through pipelines.

2. The device for extracting and separating steviol glycosides according to claim 1, wherein: A first density meter is provided on the pipeline between the first circulation pump and the first hypergravity bed.

3. A steviol glycoside extraction and separation device according to claim 2, characterized in that: A first automatic regulating valve is provided on the pipeline between the first circulation pump and the extraction material tank, and the first density meter and the first automatic regulating valve are interlocked with a control system.

4. The device for extracting and separating steviol glycosides according to claim 1, wherein: The upper gas phase outlet of the first high gravity bed is connected to the first condenser through a pipeline, the outlet of the first condenser is connected to the first separator through a pipeline, the outlet of the first separator is connected to the first solvent pump, and the outlet of the first solvent pump is connected to the first high gravity bed and the extractant recovery tank through pipelines respectively.

5. The device for extracting and separating steviol glycosides according to claim 4, wherein: A second density meter is provided on the pipeline between the first solvent pump and the first hypergravity bed, a second automatic regulating valve is provided on the pipeline between the first solvent pump and the extractant recovery tank, and the second density meter and the second automatic regulating valve are interlocked with a control system.

6. The device for extracting and separating steviol glycosides according to claim 1, wherein: The outlet of the first circulation pump is connected to the second hypergravity bed through a pipeline, the lower outlet of the second hypergravity bed is connected to the second heater through a pipeline, the outlet of the second heater is connected to the second circulation pump through a pipeline, and the outlet of the second circulation pump is connected to the second hypergravity bed and the extraction material tank through pipelines respectively.

7. The device for extracting and separating steviol glycosides according to claim 6, wherein: A third density meter is provided on the pipeline between the second circulation pump and the second hypergravity bed, and a third automatic regulating valve is provided on the pipeline between the second circulation pump and the extraction material tank. The third density meter and the third automatic regulating valve are interlocked with a control system.

8. The device for extracting and separating steviol glycosides according to claim 6, wherein: The upper gas phase outlet of the second high-gravity bed is connected to the second condenser through a pipeline, the outlet of the second condenser is connected to the second separator through a pipeline, the outlet of the second separator is connected to the second solvent pump, and the outlet of the second solvent pump is connected to the second high-gravity bed and the extractant recovery tank through pipelines respectively.

9. The device for extracting and separating steviol glycosides according to claim 8, wherein: A fourth density meter is provided on the pipeline between the second solvent pump and the second hypergravity bed, a fourth automatic regulating valve is provided on the pipeline between the second solvent pump and the extractant recovery tank, and the fourth density meter and the fourth automatic regulating valve are interlocked with a control system.

10. The device for extracting and separating steviol glycosides according to claim 1, wherein: The bottom outlet of the extraction tower is connected to an extraction residual phase tank through a pipeline.

Images