Crystallization device for stevioside production

Abstract

The utility model belongs to the technical field of stevioside production, and discloses a crystallization device for stevioside production, which comprises a batching tank, a low-temperature vacuum crystallizer, a temporary storage tank and a filter press which are sequentially communicated through a pipeline, a valve and a pump, the discharge hole of the low-temperature vacuum crystallizer is also communicated with a spray dryer; a filter cake collecting tank is arranged below a solid material outlet of the filter press, and a liquid material outlet of the filter press is communicated to the low-temperature vacuum crystallizer through a material storage tank. The stevioside crystallization device can separate and crystallize stevioside with different single glycosides, improves the crystallization yield of the stevioside, reduces the crystallization time and solvent loss, concentrates and dries the filtrate for re-crystallization, and increases the product yield or generates economic benefits.

Description

Technical Field

[0001] The utility model belongs to the technical field of stevioside production, and particularly relates to a crystallization device for stevioside production. Background Art

[0002] Stevioside is a new type of natural sweetener with a slightly astringent taste. It is a substance extracted from the herbaceous plant Stevia of the Asteraceae family. At present, the production of stevioside often uses the method of extracting stevioside dry leaves and treating them with resins before concentrated crystallization. The main crystallization methods currently used are cooling crystallization and solvent crystallization. However, both methods have defects such as low crystallization efficiency and long crystallization time. In addition, solvent crystallization also has the loss of solvent. Therefore, in the actual production process, a way must be found to overcome the above defects. Summary of the invention

[0003] The technical problem to be solved by the utility model is to provide a crystallization device for stevioside production, which overcomes the defects in the prior art, can separate and crystallize stevioside of different monoglycosides (different monoglycosides such as RA, RC, STV, DA, etc.), improve the crystallization yield of stevioside, reduce the crystallization time and solvent loss, and concentrate and dry the filtrate to recover and recrystallize the remaining monoglycosides, thereby increasing the product yield or generating economic benefits.

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

[0005] A crystallization device for stevioside production comprises a batching tank, a low-temperature vacuum crystallizer, a temporary storage tank and a filter press which are sequentially connected through pipelines, valves and pumps; the discharge port of the low-temperature vacuum crystallizer is also connected to a spray dryer; a filter cake collecting tank is arranged below the solid material outlet of the filter press, and the liquid material outlet of the filter press is connected to the low-temperature vacuum crystallizer through a storage tank.

[0006] Preferably, a stirring device and a temperature changing device are provided in the batching tank.

[0007] Preferably, the low-temperature vacuum crystallizer is provided with a stirring device, a circulation pump, a heat exchanger, a condenser, a vacuum pump and a temperature control display device.

[0008] Preferably, the low-temperature vacuum crystallizer is a customized FC-type evaporation crystallizer, and the manufacturer is Hubei Runhe Evaporator Co., Ltd.

[0009] Preferably, the spray dryer is a YPG pressure spray dryer manufactured by Shanghai Xiyang Instrument Co., Ltd. The liquid obtained by filtration through the filter press is concentrated by a low-temperature vacuum crystallizer and then spray-dried to obtain a mixed sugar product with one glycoside removed, which is used to crystallize the remaining glycosides again.

[0010] Preferably, the filter press is a plate and frame filter press, the model of which is an intelligent IV type quick-opening filter press, and the manufacturer is Jingjin Equipment Co., Ltd.

[0011] Preferably, the filter cake collecting tank is also connected to a drying device. The filter cake is dried to obtain finished stevioside.

[0012] Due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0013] The utility model utilizes the influence of pressure and temperature on solubility to improve the crystallization speed of stevioside, shorten the crystallization time, increase the crystal precipitation rate, and sequentially separate the stevioside mixed with different glycosides obtained in the previous process to obtain stevioside with different single glycosides; at the same time, the yield of crystals is improved by means of filtration by a filter press and re-concentration and drying of the filtrate; the method uses less crystallization solvent, so the solvent loss is less, and energy saving and consumption reduction in production can be achieved.

[0014] The utility model can separate and crystallize steviosides of different monoglycosides, improve the crystallization yield of stevioside, reduce the crystallization time and solvent loss, and use the filtrate for re-crystallization after concentrating and drying, thereby increasing the product yield or generating economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the utility model;

[0016] In the figure, 1. batching tank; 2. low-temperature vacuum crystallizer; 3. temporary storage tank; 4. filter press; 5. spray dryer; 6. filter cake collecting tank; 7. storage tank. DETAILED DESCRIPTION

[0017] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0018] Embodiment 1:

[0019] like Figure 1 As shown, a crystallization device for stevioside production includes a batching tank 1, a low-temperature vacuum crystallizer 2, a temporary storage tank 3 and a filter press 4 which are connected in sequence through a pipeline (not marked), a valve (not marked) and a pump (not marked); the discharge port of the low-temperature vacuum crystallizer 2 is also connected to a spray dryer 5; a filter cake collecting tank 6 is provided below the solid material outlet of the filter press 4, and the liquid material outlet of the filter press 4 is connected to the low-temperature vacuum crystallizer 2 through a storage tank 7.

[0020] In actual production, the crystallization solvent and the stevioside to be crystallized (containing different monoglycosides such as RA, RC, STV, DA, etc.) obtained in the previous process are poured into the batching tank 1, and the stirring and temperature exchange device is turned on to heat until the stevioside is dissolved; after the dissolution is completed, it is transported to the low-temperature vacuum crystallizer 2, and the circulation pump (not marked), vacuum pump (not marked) and heat exchanger (not marked) of the low-temperature vacuum crystallizer 2 are turned on, and the crystallization is stirred under negative pressure and low temperature; after the crystallization is completed, the slurry with crystals is pumped to the temporary storage tank 3 while stirring, and the temporary storage tank The feed liquid in 3 is directly pumped into the filter press 4, the filtrate obtained by the filtration is pumped into the storage tank, and then pumped into the low-temperature vacuum crystallizer 2 through circulation, the heat exchanger and the vacuum pump are turned on, the temperature is increased and concentrated, and the concentrated concentrate is transported to the spray dryer 5 for spray drying to obtain a mixed sugar product from which one glycoside is removed, and then the crystallization solvent is added and transported to the batching tank 1 together for crystallization of the remaining glycosides again; the filter cake obtained by the filtration first falls into the filter cake collecting tank 6, and then is transported to the drying device (not shown) for drying to obtain the product stevioside crystals.

[0021] It should be understood that these embodiments are only used to illustrate the present invention and are not used 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 claims attached to this application.

Claims

1. A crystallization device for stevioside production, characterized in that: It comprises a batching tank, a low-temperature vacuum crystallizer, a temporary storage tank and a filter press which are connected in sequence through pipelines, valves and pumps; the discharge port of the low-temperature vacuum crystallizer is also connected to a spray dryer; a filter cake collecting tank is arranged below the solid material outlet of the filter press, and the liquid material outlet of the filter press is connected to the low-temperature vacuum crystallizer through a storage tank.

2. The crystallization device for stevioside production according to claim 1, characterized in that: The batching tank is provided with a stirring device and a temperature changing device.

3. The crystallization device for stevioside production according to claim 1, characterized in that: The low-temperature vacuum crystallizer is provided with a stirring device, a circulation pump, a heat exchanger, a condenser, a vacuum pump and a temperature control display device.

4. The crystallization device for stevioside production according to claim 1, characterized in that: The filter press is a plate and frame filter press.

5. The crystallization device for stevioside production according to claim 1, characterized in that: The filter cake collecting tank is also connected to a drying device.

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