Recovery device for waste sugar in stevioside production process

Abstract

The utility model discloses a recovery device for waste sugar in a stevioside production process, and relates to the technical field of stevioside production, an inlet of a refined resin column is communicated with an acid liquor tank and an eluent tank, an outlet of the refined resin column is communicated with a nanofiltration membrane device, an outlet of the nanofiltration membrane device is communicated with an acidification tank, an inlet of the acidification tank is communicated with a hydrochloric acid solution tank, and an outlet of the acidification tank is communicated with an eluent tank. An outlet of the acidification tank is communicated with a plate-and-frame filter press, and a solid-phase outlet of the plate-and-frame filter press is communicated with a filter cake tank; an outlet of the filter cake tank is communicated with a dissolving tank, an inlet of the dissolving tank is communicated with a first purified water tank, an outlet of the dissolving tank is communicated with a concentration tank, an outlet of the concentration tank is communicated with a dryer, and the dryer is communicated with a stevioside tank. By recovering the stevioside, the waste of raw materials is reduced, the cost is saved, the economic benefit of the product is improved, and the method is environment-friendly.

Description

Technical Field

[0001] The utility model relates to the technical field of stevioside production, in particular to a recovery device for waste sugar in the stevioside production process. Background Technique

[0002] Stevioside, also known as steviosin, is a glycoside extracted from the leaves of the Compositae plant Stevia rebaudiana. Stevia rebaudiana is native to Paraguay and Brazil. It has the characteristics of high sweetness and low calorie. Its sweetness is 200-300 times that of sucrose, and its calorie value is only 1 / 300 of that of sucrose.

[0003] At present, after stevioside is extracted from Stevia rebaudiana, the crude mixed sugar obtained by macroporous resin separation is further processed by refined resin for desalting, decolorizing and deodorizing, etc. After the refined resin reaches the adsorption saturation, it will be regenerated by acid and alkali, and the acid and alkali water produced during regeneration will be discharged. However, the refined resin will adsorb a certain amount of stevioside. This part of stevioside has a strong adsorption force and cannot be desorbed by alcohol. Therefore, in the previous production process, this part of the adsorbed stevioside was eluted by acid and alkali water and discharged together with impurities, resulting in pollution and waste. Summary of the Invention

[0004] The technical problem to be solved by the utility model is: aiming at the deficiencies existing in the prior art, to provide a recovery device for waste sugar in the stevioside production process, which reduces the waste of raw materials and is environmentally friendly.

[0005] To solve the above technical problem, the technical solution of the utility model is:

[0006] A recovery device for waste sugar in the stevioside production process includes a refined resin column. The inlet of the refined resin column is respectively connected with an acid solution tank and an eluent tank through pipelines. The outlet of the refined resin column is connected with an eluate tank through a pipeline. The outlet of the eluate tank is connected with a nanofiltration membrane device through a pipeline. The outlet of the nanofiltration membrane device is connected with an acidification tank through a pipeline. The inlet of the acidification tank is connected with a hydrochloric acid solution tank through a pipeline. The outlet of the acidification tank is connected with a plate and frame filter press through a pipeline. The solid phase outlet of the plate and frame filter press is connected with a filter cake tank through a pipeline;

[0007] The outlet of the filter cake tank is connected with a dissolution tank. The inlet of the dissolution tank is connected with a first purified water tank through a pipeline. The outlet of the dissolution tank is connected with a concentration tank through a pipeline. The outlet of the concentration tank is connected with a dryer through a pipeline. The dryer is connected with a stevioside tank.

[0008] As an improved technical solution, the inlet of the eluent tank is respectively connected with an ethanol tank, a sodium hydroxide tank and a second purified water tank through pipelines.

[0009] As an improved technical solution, the inlet of the refined resin column is connected to the second purified water tank through a pipeline.

[0010] As an improved technical solution, the liquid phase outlet of the plate and frame filter press is connected to a filter press clear liquid tank via a pipeline.

[0011] As an improved technical solution, the outlet of the dissolution tank is connected to a desalting resin column through a pipeline, and the outlet of the desalting resin column is connected to the concentration tank through a pipeline.

[0012] As an improved technical solution, the inlet of the desalting resin column is connected to a third purified water tank through a pipeline.

[0013] As a preferred technical solution, the outlet of the dissolution tank is connected to a decolorization tank via a pipeline, the outlet of the decolorization tank is connected to a filter via a pipeline, and the liquid phase outlet of the filter is connected to the concentration tank via a pipeline.

[0014] Due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0015] The utility model discloses a device for recovering waste sugar in a stevioside production process, comprising a refined resin column, wherein the inlet of the refined resin column is connected to an acid tank and an eluent tank through pipelines, respectively, the outlet of the refined resin column is connected to an eluent tank through pipelines, the outlet of the eluent tank is connected to a nanofiltration membrane device through pipelines, the outlet of the nanofiltration membrane device is connected to an acidification tank through pipelines, the inlet of the acidification tank is connected to a hydrochloric acid solution tank through pipelines, the outlet of the acidification tank is connected to a plate-frame filter press through pipelines, the solid phase outlet of the plate-frame filter press is connected to a filter cake tank through pipelines; the outlet of the filter cake tank is connected to a dissolving tank, the inlet of the dissolving tank is connected to a first purified water tank through pipelines, the outlet of the dissolving tank is connected to a concentration tank through pipelines, the outlet of the concentration tank is connected to a dryer through pipelines, and the dryer is connected to a stevioside tank. The refined resin column is eluted by adding acid to wash away some acid-soluble impurities and pigments in the refined resin, and the effluent is directly discharged for sewage treatment. Then, the refined resin column after acid washing is added with an eluent to elute stevioside. The eluate enters the nanofiltration membrane device for concentration. The concentrated material is added with a hydrochloric acid solution, and after sufficient stirring, stevioside is precipitated under acidic conditions. The filter cake obtained after plate and frame filtration is dissolved in water, and stevioside is obtained after concentration and drying. By recycling stevioside, the waste of raw materials is reduced, costs are saved, and the economic benefits of the product are improved, which is environmentally friendly.

[0016] The inlet of the eluent tank of the utility model is connected to an ethanol tank, a sodium hydroxide tank and a second purified water tank through pipelines. The mixed solution prepared by ethanol, sodium hydroxide and water has a good elution effect on the refined resin and is conducive to the desorption of stevioside.

[0017] The inlet of the refined resin column is connected to the second purified water tank through a pipeline. The refined resin after elution is top-washed with purified water, and the resulting water top liquid is combined with the eluate and enters the nanofiltration membrane device for concentration, improving the yield of stevioside.

[0018] The liquid phase outlet of the plate and frame filter press is connected to a filter clear liquid tank through a pipeline, and the nanofiltration clear liquid is discharged for treatment.

[0019] The outlet of the dissolution tank is connected to a desalting resin column through a pipeline, and the outlet of the desalting resin column is connected to the concentration tank through a pipeline. By means of the desalting resin column, salt impurities in stevioside are removed, improving the purity of the product.

[0020] The inlet of the desalting resin column is connected to a third purified water tank through a pipeline. By flushing with purified water, adsorption of stevioside on the desalting resin is avoided, and the flushing water is concentrated and dried together, improving the yield of the product.

[0021] The outlet of the dissolution tank is connected to a decolorization tank through a pipeline, the outlet of the decolorization tank is connected to a filter through a pipeline, and the liquid phase outlet of the filter is connected to the concentration tank through a pipeline. By decolorizing stevioside, the quality of the product is improved. Description of the Drawings

[0022] The present utility model will be further described below with reference to the drawings and embodiments.

[0023] Figure 1 is a schematic structural diagram of an embodiment of the present utility model;

[0024] Wherein: 1, refined resin column; 2, acid solution tank; 3, eluent tank; 4, nanofiltration membrane device; 5, acidification tank; 6, hydrochloric acid solution tank; 7, plate and frame filter press; 8, filter cake tank; 9, dissolution tank; 10, first purified water tank; 11, concentration tank; 12, dryer; 13, stevioside tank; 14, ethanol tank; 15, sodium hydroxide tank; 16, second purified water tank; 17, filter clear liquid tank; 18, desalting resin column; 19, third purified water tank; 20, decolorization tank; 21, filter; 22, eluate tank. Detailed Embodiments

[0025] The present utility model will be further elaborated below with reference to the drawings and embodiments.

[0026] As Figure 1As shown, a device for recovering waste sugar in a stevioside production process comprises a refined resin column 1, wherein the inlet of the refined resin column 1 is connected to an acid tank 2 and an eluent tank 3 through pipelines, respectively; the outlet of the refined resin column 1 is connected to an eluent tank 22 through a pipeline, the outlet of the eluent tank 22 is connected to a nanofiltration membrane device 4 through a pipeline, the outlet of the nanofiltration membrane device 4 is connected to an acidification tank 5 through a pipeline, the inlet of the acidification tank 5 is connected to a hydrochloric acid solution tank 6 through a pipeline, the outlet of the acidification tank 5 is connected to a plate-frame filter press 7 through a pipeline, the solid phase outlet of the plate-frame filter press 7 is connected to a filter cake tank 8 through a pipeline; the outlet of the filter cake tank 8 is connected to a dissolution tank 9, the inlet of the dissolution tank 9 is connected to a first purified water tank 10 through a pipeline, the outlet of the dissolution tank 9 is connected to a concentration tank 11 through a pipeline, the outlet of the concentration tank 11 is connected to a dryer 12 through a pipeline, and the dryer 12 is connected to a stevioside tank 13. The refined resin column 1 is eluted by adding acid solution to wash away some acid-soluble impurities and pigments in the refined resin, and the effluent is directly discharged for sewage treatment. Then, the refined resin column 1 after acid washing is added with an eluent to elute stevioside, and the eluent enters the nanofiltration membrane device 4 for concentration. The concentrated material is added with a hydrochloric acid solution, and after sufficient stirring, stevioside is precipitated under acidic conditions. The filter cake obtained after plate and frame filtration is dissolved in water, and stevioside is obtained after concentration and drying. By recycling stevioside, the waste of raw materials is reduced, the cost is saved, and the economic benefits of the product are improved, which is environmentally friendly.

[0027] The inlet of the eluent tank 3 is connected to an ethanol tank 14, a sodium hydroxide tank 15 and a second purified water tank 16 through pipelines. The mixed solution prepared by ethanol, sodium hydroxide and water has a good elution effect on the refined resin and is conducive to the desorption of stevioside.

[0028] The inlet of the refined resin column 1 is connected to the second purified water tank 16 through a pipeline, and the eluted refined resin is top washed with purified water. The obtained top water is combined with the eluate and enters the nanofiltration membrane device 4 for concentration, thereby improving the yield of stevioside.

[0029] The liquid phase outlet of the plate-frame filter press 7 is connected to a filter press clear liquid tank 17 via a pipeline, and the nanofiltration clear liquid is discharged for sewage treatment.

[0030] The outlet of the dissolving tank 9 is connected to a desalting resin column 18 through a pipeline, and the outlet of the desalting resin column 18 is connected to the concentrating tank 11 through a pipeline. The desalting resin column 18 removes salt impurities in stevioside, thereby improving the purity of the product.

[0031] The inlet of the desalting resin column 18 is connected to a third purified water tank 19 through a pipeline. Purified water is used for flushing to prevent stevioside from being adsorbed on the desalting resin. The flushing water is used for concentration and drying to improve the yield of the product.

[0032] The outlet of the dissolution tank 9 is connected to a decolorization tank 20 through a pipeline, the outlet of the decolorization tank 20 is connected to a filter 21 through a pipeline, and the liquid phase outlet of the filter 21 is connected to the concentration tank 11 through a pipeline. By decolorizing the stevioside, the quality of the product is improved.

[0033] It should be understood that these embodiments are only used to illustrate the present invention and not to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can 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 device for recovering waste sugar in a stevioside production process, comprising a refined resin column, characterized in that: The inlet of the refined resin column is connected to an acid tank and an eluent tank through pipelines, respectively; the outlet of the refined resin column is connected to an eluent tank through a pipeline; the outlet of the eluent tank is connected to a nanofiltration membrane device through a pipeline; the outlet of the nanofiltration membrane device is connected to an acidification tank through a pipeline; the inlet of the acidification tank is connected to a hydrochloric acid solution tank through a pipeline; the outlet of the acidification tank is connected to a plate-frame filter press through a pipeline; and the solid phase outlet of the plate-frame filter press is connected to a filter cake tank through a pipeline; The outlet of the filter cake tank is connected to a dissolving tank, the inlet of the dissolving tank is connected to a first purified water tank through a pipeline, the outlet of the dissolving tank is connected to a concentration tank through a pipeline, the outlet of the concentration tank is connected to a dryer through a pipeline, and the dryer is connected to a stevia tank.

2. The device for recovering waste sugar from the stevioside production process according to claim 1, characterized in that: The inlet of the eluent tank is connected to an ethanol tank, a sodium hydroxide tank and a second purified water tank through pipelines.

3. The device for recovering waste sugar in the stevioside production process according to claim 2, characterized in that: The inlet of the refined resin column is connected to the second purified water tank through a pipeline.

4. The device for recovering waste sugar in the stevioside production process according to claim 1, characterized in that: The liquid phase outlet of the plate and frame filter press is connected to a filter press clear liquid tank through a pipeline.

5. The device for recovering waste sugar in the stevioside production process according to claim 1, characterized in that: The outlet of the dissolving tank is connected to a desalting resin column through a pipeline, and the outlet of the desalting resin column is connected to the concentrating tank through a pipeline.

6. The device for recovering waste sugar in the stevioside production process according to claim 5, characterized in that: The inlet of the desalting resin column is connected to a third purified water tank through a pipeline.

7. The device for recovering waste sugar in the stevioside production process according to claim 1, characterized in that: The outlet of the dissolving tank is connected to a decolorizing tank through a pipeline, the outlet of the decolorizing tank is connected to a filter through a pipeline, and the liquid phase outlet of the filter is connected to the concentrating tank through a pipeline.

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