System and method for producing crystals of a mixture of erythritol and a high-intensity sweetener

Abstract

The present invention discloses a system and method for producing a combination crystal of erythritol and a high-intensity sweetener. The system includes a fermentation liquor storage tank, a ceramic membrane filtration system, a nanofiltration system, a first evaporator, a first crystallization tank, a first centrifuge, a sugar dissolving tank, a decolorization tank, an ion exchange column, a conditioning tank, a second evaporator, a second crystallization tank, a second centrifuge, a hot air drying tank, a fluidized drying bed, and a finished product tank, which are sequentially connected through piping, and further includes a high-intensity sweetener storage tank, a first mother liquor tank, and a second mother liquor tank, the fermentation liquor storage tank is provided with a supply port for sterilized erythritol fermentation liquor, the conditioning tank is provided with a supply port for high-intensity sweetener, the first centrifuge is connected to the first mother liquor tank, the first mother liquor tank is connected to the first evaporator, the second centrifuge is connected to the second mother liquor tank, the second mother liquor tank is connected to the conditioning tank, and the finished product tank stores the blended crystal product of erythritol and high-intensity sweetener produced. The blended crystal of the present invention has a concentrated and controllable particle size, which reduces production costs.

Description

[Technical field]

[0001] The present invention relates to the technical field of sugar alcohol production, and more particularly to a system and method for producing a crystal of a blend of erythritol and a high-intensity sweetener. [Background technology]

[0002] Erythritol is a natural sugar alcohol sweetener with many advantages, such as pure sweetness, low calorie, non-cariogenicity, refreshing taste, etc., and its sweetness is 60-70% of that of sucrose, and compared with sucrose, it has a less pronounced sweetness, a weaker taste, and a bitter aftertaste. Therefore, in order to solve these shortcomings of using erythritol alone and meet people's demands for good taste and low calorie, the industry often blends or co-crystallizes high-intensity sweeteners or other sugar alcohols with erythritol.

[0003] Existing spray granulation technology involves spraying a coating on the surface of erythritol or directly spraying a sugar solution containing erythritol and other high-intensity sweeteners to granulate, and this processing method has problems such as peeling of the coating and uneven taste. In addition, cocrystallization technology may be used to cool or melt crystallize erythritol and other high-intensity sweeteners to obtain cocrystal products. For example, in Patent Publication No. CN110179096A, erythritol, inulin, stevioside, and mogroside are blended and crystallized using a solution cooling crystallization method, and the resulting blended sweetener has a uniform particle size and good taste. In Patent Publication No. CN103262972A, erythritol and sucralose are cocrystallized using a melt crystallization method to obtain cocrystals with good immediate solubility and uniform sweetness. The above methods do not mention whether the particle size of the blended crystal product can be controlled, regardless of whether cooling crystallization or melt crystallization is used. This is disadvantageous for producing products with various particle sizes. When the particle size of the product is required, the above products can only be sieved to obtain the product with the required particle size requirements, which results in an increase in production costs. Summary of the Invention [Problem to be solved by the invention]

[0004] The technical problem to be solved by the present invention is to provide a system and method for producing a blended crystal of erythritol and a high-intensity sweetener, which can obtain a blended crystal of erythritol and a high-intensity sweetener by evaporative crystallization, and can centrally control the particle size of the obtained blended crystal by a control means that combines the particle size of the added erythritol seed crystals and the stirring speed, which is advantageous for producing products with various particle sizes, reduces production costs, and improves the unpleasant flavor of erythritol, makes the taste uniform, and allows erythritol to meet consumer preferences. [Means for solving the problem]

[0005] The present invention is accomplished as follows: A fermentation liquid storage tank, a ceramic membrane filtration system, a nanofiltration system, a first evaporator, a first crystallization tank, a first centrifuge, a sugar dissolving tank, a decolorization tank, an ion exchange column, a conditioning tank, a second evaporator, a second crystallization tank, a second centrifuge, a hot air drying tank, a fluidized drying layer, and a finished product tank are sequentially connected through piping, and further include a high-intensity sweetener storage tank, a first mother liquor tank, and a second mother liquor tank, in which a supply port for sterilized erythritol fermentation liquid is provided in the fermentation liquid storage tank, a permeate outlet is provided in the nanofiltration system, and the permeate outlet is connected to a supply port of the first evaporator through piping, a purified water supply port is provided in the sugar dissolving tank, and the conditioning tank is further connected to the first evaporator. a supply port for a high-intensity sweetener is provided in the first centrifuge, a solid discharge port and a liquid discharge port are provided in the first centrifuge and a liquid discharge port are provided in the second centrifuge, the liquid discharge port of the first centrifuge is connected via a pipe to a supply port of a primary mother liquor tank, the discharge port of the primary mother liquor tank is connected via a pipe to a supply port of a first evaporator, the liquid discharge port of the second centrifuge is connected via a pipe to a supply port of a secondary mother liquor tank, the discharge port of the secondary mother liquor tank is connected via a pipe to one supply port of a blending tank, and a finished product tank stores the produced blended crystal product of erythritol and the high-intensity sweetener.

[0006] The present invention achieves the following: The manufacturing system for the blended crystals of erythritol and a high-intensity sweetener is used, Step 1: the sterilized erythritol fermentation liquid stored in the fermentation liquid storage tank is sent to a ceramic membrane filtration system through a pipe for filtration, then sent to a nanofiltration system for separation to obtain a permeate, the permeate is sent to a first evaporator through a pipe for concentration, then sent to a first crystallization vessel for crystallization, and then sent to a first centrifuge for centrifugation to obtain erythritol monocrystalline sugar as a solid and a first mother liquor as a liquid, the first mother liquor is temporarily stored in a first mother liquor tank, and then recycled to the first evaporator through a pipe for reuse, in which the permeate after nanofiltration has an erythritol content of 93% or more and a light transmittance of 85% or more; Erythritol monocrystalline sugar is put into a sugar dissolving tank and dissolved. The resulting solution is then decolorized in a decolorizing tank and impurities are removed using an ion exchange column. In the blending tank, the high-intensity sweetener solution sent from the high-intensity sweetener storage tank and the secondary mother liquor sent from the secondary mother liquor tank are mixed together to obtain a blended liquid. The blended liquid is then fed through a pipe into a second evaporator for concentration, then fed into a second crystallizing vessel for crystallization, and then fed into a second centrifuge for centrifugation to obtain erythritol and high-intensity sweetener as solids. Step 2: obtaining a secondary mother liquor as a wet sugar and a liquid, and temporarily storing the secondary mother liquor in a secondary mother liquor tank and then recycling it to a conditioning tank through piping for reuse; in this step, the ion exchange liquid that has been subjected to impurity removal by ion exchange has a light transmittance of 97% or more and a conductivity of less than 30 μs / cm; and the conditioning concentrated liquid that has been concentrated by the second evaporator has a refractive index of 65-70%, an erythritol content of 95-99.9%, and a high-intensity sweetener content of 0.1-5%; The method for producing a blended crystal of erythritol and a high-intensity sweetener includes step 3 of sequentially drying the obtained blended moist sugar of erythritol and a high-intensity sweetener through a pipe with hot air in a hot air drying tank and cold air in a fluidized drying layer to obtain a blended crystal product of erythritol and a high-intensity sweetener that is temporarily stored in a finished product tank. Effect of the Invention

[0007] Compared with the prior art, the system and method for producing a blend of erythritol and a high-intensity sweetener crystals of the present invention have the following features:

[0008] 1. The crystals of the blend of erythritol and high-intensity sweeteners obtained by the present invention have a concentrated and controllable particle size.

[0009] 2. The crystals of the blend of erythritol and a high-intensity sweetener obtained by the present invention have an appearance similar to that of erythritol crystals and have a good crystal shape.

[0010] 3. The blended crystals of erythritol and a high-intensity sweetener obtained by the present invention have an adjustable sweetness, which is 0.7 to 2 times that of sucrose, and has a more uniform and favorable taste than erythritol crystals. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is a schematic diagram showing the principle of a preferred embodiment of a system for producing a blend of erythritol and a high-intensity sweetener according to the present invention. [Diagram 2] FIG. 2 is a schematic diagram of the particle size distribution of a blended crystal product of erythritol and a high-intensity sweetener produced in each Example of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] In order to clarify the technical problems, technical solutions and advantageous effects of the present invention, the present invention will be described in more detail below with reference to the drawings and examples. It should be understood that the specific examples described herein are only used to illustrate the present invention and are not intended to limit the present invention.

[0013] As shown in Fig. 1, a preferred embodiment of the system for producing a blend of erythritol and a high-intensity sweetener of the present invention includes a fermentation liquid storage tank 1, a ceramic membrane filtration system 2, a nanofiltration system 3, a first evaporator 4, a first crystallization tank 5, a first centrifuge 6, a sugar dissolving tank 7, a decolorization tank 8, an ion exchange column 9, a conditioning tank 10, a second evaporator 11, a second crystallization tank 12, a second centrifuge 13, a hot air drying tank 14, a fluidized drying layer 15, and a finished product tank 16, which are connected in sequence through piping, and further includes a high-intensity sweetener storage tank 17, a first mother liquor tank 18, and a second mother liquor tank 19. The direction of the arrows in the figure indicates the flow direction of materials in this system.

[0014] The fermentation liquid storage tank 1 is provided with a supply port for the sterilized erythritol fermentation liquid, the nanofiltration system 3 is provided with a permeate discharge port, and the permeate discharge port is connected via piping to the supply port of the first evaporator 4. The sugar dissolution tank 7 is provided with a water supply port for purified water, and the blending tank 10 is provided with a supply port for a high-intensity sweetener.

[0015] The first centrifuge 6 and the second centrifuge 13 are provided with a solid discharge port and a liquid discharge port, respectively, and the liquid discharge port of the first centrifuge 6 is connected to a supply port of a primary mother liquor tank 18 via a pipe, and the discharge port of the primary mother liquor tank 18 is connected to a supply port of the first evaporator 4 via a pipe. The liquid discharge port of the second centrifuge 13 is connected to a supply port of a secondary mother liquor tank 19 via a pipe, and the discharge port of the secondary mother liquor tank 19 is connected to one supply port of the blending tank 10 via a pipe. The finished product tank stores the produced blended crystal product of erythritol and high-intensity sweetener.

[0016] The sterilized erythritol fermentation liquid is fed from a supply port into a fermentation liquid storage tank 1 for temporary storage. The sterilized erythritol fermentation liquid is filtered by a ceramic membrane filtration system 2 and a nanofiltration system 3 to remove most of the impurities, and then subjected to evaporation and concentration by a first evaporator 4, crystallization by a first crystallization vessel 5, and centrifugation by a first centrifuge 6 to obtain erythritol monocrystalline sugar and a primary mother liquor. The erythritol monocrystalline sugar is sent via piping to a sugar dissolution tank 7 where it is dissolved. The resulting solution is sequentially decolorized in a decolorization tank 8 and ion-exchanged in an ion exchange column 9, and mixed with the high-intensity sweetener solution sent from the high-intensity sweetener storage tank 17 and the secondary mother liquor sent from the secondary mother liquor tank 19 in a blending tank 10 to become a blended liquid. The blended liquid is further concentrated in a second evaporator 11, crystallized in a second crystallization tank 12, centrifuged in a second centrifuge 13, hot-air dried in a hot-air drying tank 14, and cold-air dried in a fluidized drying bed 15 to obtain a blended crystal product of erythritol and a high-intensity sweetener.

[0017] The high intensity sweetener is at least one of stevioside, mogroside, sucralose, acesulfame potassium, and aspartame.

[0018] The present invention also discloses a method for producing a blended crystal of erythritol and a high-intensity sweetener, the method using the blended crystal production system of erythritol and a high-intensity sweetener, and the method includes the following steps:

[0019] Step 1: The sterilized erythritol fermentation liquid stored in the fermentation liquid storage tank 1 is sent to the ceramic membrane filtration system 2 through a pipe for filtration, then sent to the nanofiltration system 3 for separation to obtain a permeate, which is sent to the first evaporator 4 through a pipe for concentration, then sent to the first crystallization pot 5 for crystallization, and then sent to the first centrifuge 6 for centrifugation to obtain erythritol monocrystalline sugar as a solid and primary mother liquor as a liquid, which is temporarily stored in the primary mother liquor tank 18 and then recycled to the first evaporator 4 through a pipe for reuse. In this step, the permeate after nanofiltration has an erythritol content of 93% or more and a light transmittance of 85% or more.

[0020] Step 2: Erythritol monocrystalline sugar is put into the sugar dissolution tank 7 for dissolution, and then the obtained solution is decolorized in the decolorization tank 8 and impurities are removed by the ion exchange column 9. In the harmony tank 10, the high-intensity sweetener solution sent from the high-intensity sweetener storage tank 17 and the secondary mother liquor sent from the secondary mother liquor tank 19 are mixed together to obtain a harmony liquid. The harmony liquid is then put into the second evaporator 11 via piping for concentration, then put into the second crystallization tank 12 for crystallization, and then put into the second centrifuge 13 for centrifugation to obtain a blended wet sugar of erythritol and high-intensity sweetener as a solid and a secondary mother liquor as a liquid. The secondary mother liquor is temporarily stored in the secondary mother liquor tank 19 and then recycled to the harmony tank 10 via piping for reuse. In this step, the ion exchange liquid that has been subjected to impurity removal by ion exchange has a light transmittance of 97% or more and a conductivity of less than 30 μs / cm. The harmonized concentrated liquid concentrated by the second evaporator 11 has a refractive index of 65 to 70%, an erythritol content of 95 to 99.9%, and a high-intensity sweetener content of 0.1 to 5%.

[0021] Step 3: The obtained blended moist sugar of erythritol and high-intensity sweetener is subjected to hot air drying treatment in the hot air drying tank 14 via piping and then cold air drying in the fluidized drying layer 15 to obtain a blended crystal product of erythritol and high-intensity sweetener which is temporarily stored in the finished product tank 16.

[0022] Specifically, in step 1, the refractive index of the erythritol concentrate obtained by concentration in the first evaporator 4 is 55 to 60%, and the crystallization temperature in the first crystallization vessel 5 is 60 to 65°C.

[0023] Specifically, in step 2, in crystallization in the second crystallization vessel 12, the stirring speed is set to 50-100 rpm, the crystallization temperature is set to 60-65°C, erythritol seed crystals are added, the seed crystals are uniformly dispersed in the sugar solution, and then the crystals are grown for 0.5-2 hours while maintaining the temperature and stirring speed. After the crystal growth is completed, the pressure in the second crystallization vessel 12 is set to 150-220 mbar, and evaporation crystallization is performed while stirring. When the crystallization has been performed for 2-6 hours, the crystallization is stopped and the vessel is removed. The addition ratio of erythritol seed crystals is 1-5%, and the seed crystal grain size is 60-120 mesh.

[0024] Specifically, in step 3, the temperature of the hot air in the hot air drying tank 14 is set to 90 to 100°C, and the temperature of the cold air in the fluidized drying layer 15 is set to 15 to 30°C.

[0025] Hereinafter, the system and method for producing a blend of erythritol and a high-intensity sweetener crystal of the present invention will be described with reference to specific examples. Example 1

[0026] A first embodiment of the method for producing a combination crystal of erythritol and a high-intensity sweetener of the present invention includes the following steps.

[0027] (11) The sterilized erythritol fermentation liquid was passed through a ceramic membrane filtration system 2 and a nanofiltration system 3 in sequence to remove bacteria and some of the other impurities, and a nanofiltrate with an erythritol content of 93% and a light transmittance of 85% was obtained. The nanofiltrate was concentrated in a first evaporator 4 to obtain an erythritol concentrate with a refractive index of 55%. The erythritol concentrate was evaporated and crystallized in a first crystallization vessel 5 at a crystallization temperature of 60°C to obtain an erythritol sugar paste. The erythritol sugar paste was centrifuged in a first centrifuge 6 to obtain erythritol single crystal sugar and a primary centrifuged mother liquor. The primary centrifuged mother liquor was recycled and reused for nanofiltration.

[0028] (12) Erythritol monocrystalline sugar is put into the sugar dissolution tank 7 and dissolved therein. The resulting solution is passed through the decolorization tank 8 and the ion exchange column 9 in sequence to obtain a decolorized ion exchange solution with a light transmittance of 98% and a conductivity of 18 μs / cm. In the harmony tank 10, the decolorized ion exchange solution is mixed with the stevioside solution in a predetermined ratio to obtain a harmony solution with an erythritol content of 99.84% and a stevioside content of 0.1%. The harmony solution is put into the second evaporator 11 for concentration, and a harmony concentrated solution of erythritol and stevioside with a refractive index of 66% is obtained.

[0029] (13) The harmonized concentrated liquid was put into the second crystallization vessel 12, the stirring speed was set to 60 rpm, the temperature was set to 65°C, and erythritol seed crystals with a particle size of 60 to 80 mesh were added at a ratio of 2%. After the erythritol seed crystals were uniformly dispersed in the sugar liquid, the crystals were grown for 1 hour while maintaining the temperature and stirring speed. After the crystal growth was completed, the pressure in the second crystallization vessel 12 was set to 18 MPa, and evaporation crystallization was carried out while stirring. After 4 hours of evaporation crystallization, the crystallization was stopped and the vessel was removed to obtain an erythritol-stevioside blended crystalline sugar paste.

[0030] (14) The erythritol-stevioside blended crystal sugar paste was separated in the second centrifuge 13 to obtain erythritol-stevioside blended crystals and a secondary mother liquor. The blended crystals were dried with hot air at 90°C and then with cold air at 30°C to obtain an erythritol-stevioside blended crystal product, and the secondary centrifuged mother liquor was recycled to the harmony tank 10 for reuse.

[0031] The particle size distribution of the erythritol-stevioside blended crystal product obtained in this example after sieving is shown in Table 1 below.

[0032] [Table 1] As can be seen from Table 1, the percentage of erythritol-stevioside blended crystal products with particle sizes between 10 and 30 mesh was 70.69%. Example 2

[0033] The second embodiment of the method for producing the combination crystals of erythritol and a high-intensity sweetener of the present invention includes the following steps.

[0034] (21) The sterilized erythritol fermentation liquid was passed through a ceramic membrane filtration system 2 and a nanofiltration system 3 in sequence to remove bacteria and some of the other impurities, obtaining a nanofiltrate with an erythritol content of 96% and a light transmittance of 87%. The nanofiltrate was concentrated in a first evaporator 4 to obtain an erythritol concentrate with a refractive index of 60%. The erythritol concentrate was evaporated and crystallized in a first crystallization vessel 5 at a crystallization temperature of 60°C to obtain an erythritol sugar paste. The erythritol sugar paste was centrifuged in a first centrifuge 6 to obtain erythritol single crystal sugar and a primary centrifuged mother liquor. The primary centrifuged mother liquor was recycled and reused for nanofiltration.

[0035] (22) Erythritol monocrystalline sugar is put into the sugar dissolution tank 7 and dissolved therein. The resulting solution is passed through the decolorization tank 8 and the ion exchange column 9 in sequence to obtain a decolorized ion exchange solution with a light transmittance of 99% and a conductivity of 25 μs / cm. In the harmony tank 10, the decolorized ion exchange solution is mixed with the stevioside solution in a predetermined ratio to obtain a harmony solution with an erythritol content of 99.11%, a stevioside content of 0.64%, and a mogroside content of 0.25%. The harmony solution is put into the second evaporator 11 for concentration, and a harmony concentrated solution of erythritol-stevioside with a refractive index of 70% is obtained.

[0036] (23) The harmonized concentrated liquid was put into the second crystallization vessel 12, the stirring speed was set to 100 rpm, the temperature was set to 64°C, and erythritol seed crystals with a particle size of 100 to 120 mesh were added at a ratio of 5%. After the erythritol seed crystals were uniformly dispersed in the sugar liquid, the crystals were grown for 0.5 h while maintaining the temperature and stirring speed. After the crystal growth was completed, the pressure in the second crystallization vessel 12 was set to 20 MPa, and evaporation crystallization was carried out while stirring. After 6 hours of evaporation crystallization, the crystallization was stopped and the vessel was removed to obtain an erythritol-stevioside blended crystalline sugar paste.

[0037] (24) The erythritol-stevioside blended crystal sugar paste was separated in the second centrifuge 13 to obtain erythritol-stevioside blended crystals and a secondary mother liquor. The blended crystals were dried with hot air at 95°C and then with cold air at 22°C to obtain an erythritol-stevioside blended crystal product, and the secondary centrifuged mother liquor was recycled to the harmony tank 10 for reuse.

[0038] The particle size distribution of the erythritol-stevioside blended crystal product obtained in this example after sieving is shown in Table 2 below.

[0039] [Table 2] As can be seen from Table 2, the percentage of erythritol / stevioside blended crystal products with a particle size of 40 mesh was 76.2%. Example 3

[0040] The third embodiment of the method for producing a combination crystal of erythritol and a high-intensity sweetener of the present invention includes the following steps.

[0041] (31) The sterilized erythritol fermentation liquid was passed through a ceramic membrane filtration system 2 and a nanofiltration system 3 in sequence to remove bacteria and some of the other impurities, and a nanofiltrate with an erythritol content of 95% and a light transmittance of 90% was obtained. The nanofiltrate was concentrated in a first evaporator 4 to obtain an erythritol concentrate with a refractive index of 58%. The erythritol concentrate was evaporated and crystallized in a first crystallization vessel 5 at a crystallization temperature of 65°C to obtain an erythritol sugar paste. The erythritol sugar paste was centrifuged in a first centrifuge 6 to obtain erythritol single crystal sugar and a primary centrifuged mother liquor. The primary centrifuged mother liquor was recycled and reused for nanofiltration.

[0042] (32) Erythritol monocrystalline sugar is put into the sugar dissolution tank 7 for dissolution, and the obtained solution is passed through the decolorization tank 8 and the ion exchange column 9 in sequence to obtain a decolorized ion exchange solution with a light transmittance of 99% and a conductivity of 20 μs / cm. In the harmony tank 10, the decolorized ion exchange solution is mixed with the stevioside solution in a predetermined ratio to obtain a harmony solution with an erythritol content of 95.00%, a sucralose content of 0.88%, a stevioside content of 1.12%, and a mogroside content of 3.0%. The harmony solution is put into the second evaporator 11 for concentration, and a harmony concentrated solution of erythritol-stevioside with a refractive index of 68% is obtained.

[0043] (33) The harmonized concentrated liquid was put into the second crystallization vessel 12, the stirring speed was set to 85 rpm, the temperature was set to 65°C, and erythritol seed crystals with a particle size of 80 to 100 mesh were added at a ratio of 1%. After the erythritol seed crystals were uniformly dispersed in the sugar liquid, the crystals were grown for 2 hours while maintaining the temperature and stirring speed. After the crystal growth was completed, the pressure in the second crystallization vessel 12 was set to 15 MPa, and evaporation crystallization was carried out while stirring. After 2 hours of evaporation crystallization, the crystallization was stopped and the mixture was removed from the vessel to obtain an erythritol-stevioside blended crystalline sugar paste.

[0044] (34) The erythritol-stevioside blended crystal sugar paste was separated in the second centrifuge 13 to obtain erythritol-stevioside blended crystals and a secondary mother liquor. The blended crystals were dried with hot air at 100°C and then with cold air at 15°C to obtain an erythritol-stevioside blended crystal product, and the secondary centrifuged mother liquor was recycled to the harmony tank 10 for reuse.

[0045] The particle size distribution of the erythritol-stevioside blended crystal product obtained in this example by sieving is shown in Table 3 below.

[0046] [Table 3] As can be seen from Table 3, the percentage of erythritol-stevioside blended crystal products with a particle size of 30-50 mesh was 67.93%.

[0047] The particle size distribution of the erythritol / stevioside blended crystal products produced in Examples 1 to 3 was summarized in the particle size distribution diagram shown in Figure 2.

[0048] The taste of each of the erythritol-stevioside blended crystal products obtained in each example was tested. The taste was also compared with that of sucrose products and stevioside products. Sugar solutions with a concentration of 7% for both sucrose and stevioside were prepared, where the sweetness of 7% sucrose was set at 7, and the taste was divided into seven levels: 1-very weak, 2-relatively weak, 3-slightly weak, 4-normal, 5-slightly strong, 6-relatively strong, and 7-very strong. The test results are shown in Table 4.

[0049] [Table 4] The above are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A system for producing a crystal of a combination of erythritol and a high-intensity sweetener, comprising: The apparatus includes a fermentation liquid storage tank, a ceramic membrane filtration system, a nanofiltration system, a first evaporator, a first crystallization tank, a first centrifuge, a sugar dissolving tank, a decolorization tank, an ion exchange column, a conditioning tank, a second evaporator, a second crystallization tank, a second centrifuge, a hot air drying tank, a fluidized drying layer, and a finished product tank, which are sequentially connected to each other through piping. The apparatus further includes a high-intensity sweetener storage tank, a first mother liquor tank, and a second mother liquor tank. The fermentation liquid storage tank is provided with a supply port for sterilized erythritol fermentation liquid, and the nanofiltration system is provided with a permeate outlet, which is connected to the supply port of the first evaporator through piping. The sugar dissolving tank is provided with a supply port for purified water. a water inlet, a supply inlet for a high-intensity sweetener in the blending tank, a first centrifuge and a second centrifuge each having a solid discharge outlet and a liquid discharge outlet, the liquid discharge outlet of the first centrifuge connected via a pipe to a supply inlet of a primary mother liquor tank, the discharge outlet of the primary mother liquor tank connected via a pipe to a supply inlet of a first evaporator, the liquid discharge outlet of the second centrifuge connected via a pipe to a supply inlet of a secondary mother liquor tank, and the discharge outlet of the secondary mother liquor tank connected via a pipe to one supply inlet of the blending tank, and the finished product tank stores the blended crystal product of erythritol and the high-intensity sweetener produced.

2. The system for producing a crystal of a blend of erythritol and a high-intensity sweetener according to claim 1, characterized in that the high-intensity sweetener is at least one of stevioside, mogroside, sucralose, acesulfame potassium, and aspartame.

3. The system for producing a crystal of a blend of erythritol and a high-intensity sweetener according to claim 1 or 2 is used, Step 1: the sterilized erythritol fermentation liquid stored in the fermentation liquid storage tank is sent to a ceramic membrane filtration system through a pipe for filtration, then sent to a nanofiltration system for separation to obtain a permeate, the permeate is sent to a first evaporator through a pipe for concentration, then sent to a first crystallization vessel for crystallization, and further sent to a first centrifuge for centrifugation to obtain erythritol monocrystalline sugar as a solid and a first mother liquor as a liquid, the first mother liquor is temporarily stored in a first mother liquor tank, and then recycled to the first evaporator through a pipe for reuse, in which the permeate after nanofiltration has an erythritol content of 93% or more and a light transmittance of 85% or more; Erythritol monocrystalline sugar is put into a sugar dissolving tank and dissolved therein. The resulting solution is then decolorized in a decolorizing tank and impurities are removed using an ion exchange column. In a blending tank, the blended solution is mixed with the high-intensity sweetener solution sent from the high-intensity sweetener storage tank and the secondary mother liquor sent from the secondary mother liquor tank to obtain a blended solution. The blended solution is then fed through a pipe into a second evaporator to be concentrated, then fed into a second crystallizing vessel to be crystallized, and then fed into a second centrifuge to be centrifuged to obtain erythritol and high-intensity sweetener as solids. Step 2: obtaining a second mother liquor as a blended wet sugar and a liquid, and temporarily storing the second mother liquor in a second mother liquor tank and then recycling it to a blending tank via piping for reuse; in this step, the ion exchange liquid that has been subjected to the removal of impurities by ion exchange has a light transmittance of 97% or more and a conductivity of less than 30 μs / cm, and the blended concentrated liquid that has been concentrated by the second evaporator has a refractive index of 65-70%, an erythritol content of 95-99.9%, and a high-intensity sweetener content of 0.1-5%; and step 3, subjecting the obtained blended moist sugar of erythritol and a high-intensity sweetener to hot air drying in a hot air drying tank and cold air drying in a fluidized drying layer in sequence via piping to obtain a blended crystal product of erythritol and a high-intensity sweetener that is temporarily stored in a finished product tank.

4. The method for producing a blend crystal of erythritol and a high-intensity sweetener according to claim 3, characterized in that in step 1, the refractive index of the erythritol concentrate obtained by concentration in the first evaporator is 55-60%, and the crystallization temperature in the first crystallization vessel is 60-65°C.

5. In step 2, in the crystallization in the second crystallization vessel, the stirring speed is set to 50-100 rpm, the crystallization temperature is set to 60-65°C, erythritol seed crystals are added, the seed crystals are uniformly dispersed in the sugar solution, and then the crystals are grown for 0.5-2 hours while maintaining the temperature and stirring speed. After the crystal growth is completed, the pressure in the second crystallization vessel is set to 150-220 mbar, and evaporation crystallization is performed while stirring. After the crystallization has been performed for 2-6 hours, the crystallization is stopped and the vessel is removed. The method for producing a blend crystal of erythritol and a high-intensity sweetener according to claim 3, characterized in that the addition ratio of erythritol seed crystals is 1 to 5%, and the particle size of the seed crystals is 60 to 120 mesh.

6. The method for producing a blend crystal of erythritol and a high-intensity sweetener according to claim 3, characterized in that in step 3, the temperature of the hot air in the hot air drying tank is 90 to 100°C, and the temperature of the cold air in the fluidized drying layer is 15 to 30°C.

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