Maltitol cooling crystallization system

Abstract

The utility model belongs to the technical field of sugar alcohol, and relates to a maltitol cooling crystallization system. The system comprises a crystallization cylinder, a centrifugal feeding trough, a centrifugal machine, a centrifugal mother liquid tank and a centrifugal pump, a massecuite discharging port and a mother liquid inlet are formed in the crystallization cylinder, a discharging pipeline is arranged at the crystallized massecuite discharging port and communicated with the feeding end of the centrifugal feeding trough, and the discharging end of the centrifugal feeding trough is communicated with the feeding end of the centrifugal machine through a conveying pipe. A mother liquor outlet and a moist sugar outlet are further formed in the centrifugal machine, the centrifugal moist sugar is communicated with the next process through the moist sugar outlet, a mother liquor pipe is arranged at the mother liquor outlet and communicated with a feeding port of the centrifugal mother liquor tank, and a liquor outlet of the centrifugal mother liquor tank is communicated with a mother liquor inlet of the crystallization cylinder through the centrifugal mother liquor pipe. According to the utility model, a mixing operation is added after cooling crystallization is finished, and centrifugal mother liquor is injected into the crystallization cylinder to be mixed with crystallized massecuite, so that the flowability of the crystallized massecuite is improved, and the crystallization yield of maltitol is improved.

Description

Technical Field

[0001] This utility model belongs to the field of sugar alcohol technology, and specifically relates to a maltitol cooling crystallization system. Background Technology

[0002] Cooling crystallization is a crystallization method that involves first heating the solution to evaporate the solvent into a saturated solution, and then gradually reducing the temperature of the hot saturated solution to decrease the solubility and precipitate crystals. In the production process of maltitol, cooling crystallization is a common crystallization method. It involves evaporating the maltitol liquid to 80-85% solids and then using water to exchange heat and cool it down to 20-40°C to obtain maltitol crystals. However, due to the high viscosity of maltitol and the poor fluidity of the crystallized sugar paste, there is still room for optimization in the existing cooling crystallization process: (1) The poor fluidity of the crystallized sugar paste and the slow discharge result in the need to maintain a large inclination angle in the discharge pipe of the crystallization tank, which places high demands on the equipment layout; (2) The discharge valve is closed for a long time during the cooling process, and the discharge port is easily blocked by crystallization, which prevents the material from being discharged normally; (3) The cooling endpoint needs to be controlled due to the fluidity of the crystallized sugar paste, which affects the cooling crystallization yield; (4) Crystallized sugar paste is easily left on the surface of the tank wall and the stirring shaft, which affects the yield of a single tank and also increases the load on the stirring shaft. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a maltitol cooling crystallization system, which adds a mixing operation after the cooling crystallization is completed. The centrifuged mother liquor is injected into the crystallization tank and mixed with the crystallized sugar paste to improve the fluidity of the crystallized sugar paste, thereby improving the crystallization yield of maltitol.

[0004] This invention is implemented as follows: a maltitol cooling crystallization system is provided, including a crystallization tank. The crystallization tank is equipped with a cooling system for cooling and crystallizing the maltitol stock solution inside into crystalline sugar paste, and a stock solution inlet. The system also includes a centrifugal feeding tank, a centrifuge, a centrifugal mother liquor tank, and a centrifugal pump. The crystallization tank is equipped with a sugar paste outlet and a mother liquor inlet. A discharge pipe is provided at the crystalline sugar paste outlet, connecting to the inlet of the centrifugal feeding tank. The outlet of the centrifugal feeding tank is connected to the inlet of the centrifuge via a conveying pipe. The centrifuge separates the crystalline sugar paste into centrifuged wet sugar and centrifugal mother liquor. The centrifuge is also equipped with a mother liquor outlet and a wet sugar outlet. The centrifuged wet sugar is connected to the next process via the wet sugar outlet. A mother liquor pipe is provided at the mother liquor outlet, connecting to the inlet of the centrifugal mother liquor tank. The centrifugal mother liquor tank is used to collect the centrifugal mother liquor. The outlet of the centrifugal mother liquor tank is connected to the mother liquor inlet of the crystallization tank via the centrifugal mother liquor pipe. The centrifugal pump is installed on the centrifugal mother liquor pipe.

[0005] Furthermore, a steam pipe is installed at the feed end of the centrifugal feeding tank, and a steam pneumatic valve is installed on the steam pipe. The steam pipe is connected to an external clean steam source, and the steam is used to clear the blockage of crystalline sugar paste in the centrifugal feeding tank.

[0006] Furthermore, a discharge pneumatic valve is installed on the discharge pipe.

[0007] Compared with existing technologies, the maltitol cooling crystallization system of this invention adds a mixing operation after cooling crystallization, by injecting centrifuged mother liquor and mixing it with the maltitol paste to improve the fluidity of the paste. This invention has the following characteristics:

[0008] 1. The flowability of crystalline sugar paste is improved by using the centrifuged mother liquor generated by the system, without the need to add additional surfactants;

[0009] 2. Improved fluidity of crystalline sugar paste reduces material residue on the surface of the crystallization tank and the stirring shaft, thereby increasing the yield per tank.

[0010] 3. After the fluidity of crystalline sugar paste is improved, the required inclination angle of the feeding pipe decreases, reducing the space requirements of the equipment;

[0011] 4. Lower the temperature at the endpoint of cooling crystallization from the existing 35℃ to 25℃, thereby increasing the crystallization yield. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of a preferred embodiment of the maltitol cooling crystallization system of this utility model;

[0013] Figure 2 This is a schematic diagram of the cooling crystallization method for maltitol according to this invention. Detailed Implementation

[0014] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0015] Please refer to Figure 1 As shown in the figure, this is a preferred embodiment of the maltitol cooling crystallization system of the present invention. The arrows in the figure indicate the flow direction of the material in this system. The system includes a crystallization tank 1, on which a cooling system (not shown in the figure) is provided for cooling and crystallizing the maltitol stock solution inside into crystalline sugar paste, and a stock solution inlet 11. The system also includes a centrifugal feeding tank 2, a centrifuge 3, a centrifugal mother liquor tank 4, and a centrifugal pump 5.

[0016] A sugar paste outlet 12 and a mother liquor inlet 13 are respectively provided on the crystallization tank 1. A feeding pipe 6 is provided at the sugar paste outlet 12 and connected to the feed end of the centrifugal feeding tank 2. The crystallized sugar paste enters the centrifugal feeding tank 2 through the feeding pipe 6. The discharge end of the centrifugal feeding tank 2 is connected to the feed end of the centrifuge 3 through the conveying pipe 7.

[0017] Centrifuge 3 is used to separate crystalline sugar paste into centrifuged molten sugar and centrifuged mother liquor. Centrifuge 3 is also equipped with a mother liquor outlet 31 and a molten sugar outlet 32. The molten sugar is connected to the next process through the molten sugar outlet 32. A mother liquor feed pipe 8 is provided at the mother liquor outlet 31 and is connected to the inlet of the centrifuged mother liquor tank 4. The centrifuged mother liquor tank 4 is used to collect the centrifuged mother liquor. The outlet of the centrifuged mother liquor tank 4 is connected to the mother liquor inlet 13 of the crystallization cylinder 1 through a centrifuged mother liquor feed pipe 9. A centrifugal pump 5 is installed on the centrifuged mother liquor feed pipe 9.

[0018] A steam pipe 10 is also provided at the feed end of the centrifugal feeding tank 2, and a steam pneumatic valve 101 is provided on the steam pipe 10. The steam pipe 10 is connected to an external clean steam source, and the steam is used to clear the blockage of crystalline sugar paste in the centrifugal feeding tank 2.

[0019] To prevent the centrifugal feed trough 2 from being clogged by crystalline sugar paste, a steam pipe 10 is installed. When the centrifugal feed trough 2 becomes clogged with crystalline sugar paste, clean external steam is introduced into the centrifugal feed trough 2 to dissolve the clogged crystalline sugar paste. The dissolved sugar water flows into the centrifuge 3 along with the crystalline sugar paste.

[0020] A discharge pneumatic valve 61 is installed on the discharge pipe 6.

[0021] Please refer to the following at the same time Figure 1 and Figure 2 As shown, this utility model is implemented by providing a method for cooling crystallization of maltitol, which uses the maltitol cooling crystallization system described above to perform maltitol cooling crystallization. The arrows in the figure indicate the flow direction of the material in this system, as well as the flow direction. The method includes the following steps:

[0022] Step 1, Feeding: Inject the maltitol stock solution to be crystallized into the stock solution inlet 11. The feeding end temperature is 70℃.

[0023] Step 2, Cooling: Turn on the cooling system of crystallization tank 1 and cool it down at a rate of 1~1.5℃ / h. When the temperature drops to 25℃, stop cooling.

[0024] Step 3, Mixing: Turn on centrifugal pump 5 and transfer the centrifugal mother liquor temporarily stored in centrifugal mother liquor tank 4 to the cooled crystallization tank 1 to mix with the crystallized sugar paste. The amount of centrifugal mother liquor added is 10-20% of the total amount of crystallized sugar paste. Mix for 1-2 hours.

[0025] Step 4, feeding: The mixture of crystallized sugar paste and centrifugal mother liquor is fed into the centrifugal feeding tank 2 through the feeding pipe 6, and then transported to the centrifuge 3 through the centrifugal feeding tank 2.

[0026] Step 5, Centrifugation: Turn on centrifuge 3. The centrifuged molasses will proceed to the next process. The centrifuged mother liquor will be temporarily stored in centrifuged mother liquor tank 4 through mother liquor feed pipe 9. Any excess centrifuged mother liquor in centrifuged mother liquor tank 4 will be stored separately for later use.

[0027] The maltitol cooling crystallization system and method of this invention are further illustrated below through specific embodiments.

[0028] Example 1

[0029] Please also refer to Figure 1 and Figure 2 As shown, the first embodiment of the maltitol cooling crystallization method of this utility model includes the following steps:

[0030] Step 11, Feeding: Close the discharge pneumatic valve 61, and inject the maltitol stock solution to be crystallized into the stock solution inlet 11. The feeding end temperature is 70℃. The refractive index of the maltitol stock solution to be crystallized is 83%, and the content is 92.5%.

[0031] Step 12, Cooling: Turn on the cooling system of crystallization tank 1 and cool it down at a rate of 1℃ / h. When the temperature drops to 25℃, stop cooling.

[0032] Step 13, Mixing: Turn on centrifugal pump 5 and transfer the centrifugal mother liquor temporarily stored in centrifugal mother liquor tank 4 to the cooled crystallization tank 1 to mix with the crystallized sugar paste. The amount of centrifugal mother liquor added is 20% of the total amount of crystallized sugar paste. Mix for 1 hour.

[0033] Step 14, Feeding: The mixture of crystalline sugar paste and centrifugal mother liquor is fed into the centrifugal feeding tank 2 through the feeding pipe 6, and then transported to the centrifuge 3 through the centrifugal feeding tank 2.

[0034] Step 15, Centrifugation: Turn on centrifuge 3. The centrifuged hygroscopic sugar obtained by centrifugation will enter the next process to further prepare maltitol crystals. The centrifuged mother liquor will enter the centrifuged mother liquor tank 4 through the mother liquor feed pipe 9 for temporary storage.

[0035] The maltitol crystals prepared in this embodiment have a purity of over 98.5% and a centrifugal yield of 58.2%.

[0036] Example 2

[0037] Please also refer to Figure 1 and Figure 2 As shown, the second embodiment of the maltitol cooling crystallization method of this utility model includes the following steps:

[0038] Step 21, Feeding: Close the discharge pneumatic valve 61, and inject the maltitol stock solution to be crystallized into the stock solution inlet 11. The feeding end temperature is 70℃. The refractive index of the maltitol stock solution to be crystallized is 83%, and the content is 92.5%.

[0039] Step 22, Cooling: Turn on the cooling system of crystallization tank 1 and cool it down at a rate of 1.5℃ / h. When the temperature drops to 25℃, stop cooling.

[0040] Step 23, Mixing: Turn on centrifugal pump 5 and transfer the centrifugal mother liquor temporarily stored in centrifugal mother liquor tank 4 to the cooled crystallization tank 1 to mix with the crystallized sugar paste. The amount of centrifugal mother liquor added is 15% of the total amount of crystallized sugar paste. Mix for 1.5 hours.

[0041] Step 24, Feeding: The mixture of crystallized sugar paste and centrifugal mother liquor is fed into the centrifugal feeding tank 2 through the feeding pipe 6, and then transported to the centrifuge 3 through the centrifugal feeding tank 2.

[0042] Step 25, Centrifugation: Turn on centrifuge 3, and centrifuge the centrifuged hygroscopic sugar to the next process to further prepare maltitol crystals. The centrifuged mother liquor enters the centrifuged mother liquor tank 4 through the mother liquor feed pipe 9 for temporary storage.

[0043] The maltitol crystals prepared in this embodiment have a purity of over 98.5% and a centrifugal yield of 60.5%.

[0044] Example 3

[0045] Please refer to the following at the same time Figure 1 and Figure 2 As shown, the third embodiment of the maltitol cooling crystallization method of this utility model includes the following steps:

[0046] Step 31, Feeding: Close the discharge pneumatic valve 61, and inject the maltitol stock solution to be crystallized into the stock solution inlet 11. The feeding end temperature is 70℃. The refractive index of the maltitol stock solution to be crystallized is 83%, and the content is 92.5%.

[0047] Step 32, Cooling: Turn on the cooling system of crystallization tank 1 and cool it down at a rate of 1.2℃ / h. When the temperature drops to 25℃, stop cooling.

[0048] Step 33, Mixing: Turn on centrifugal pump 5 and transfer the centrifugal mother liquor temporarily stored in centrifugal mother liquor tank 4 to the cooled crystallization tank 1 to mix with the crystallized sugar paste. The amount of centrifugal mother liquor added is 10% of the total amount of crystallized sugar paste. Mix for 2 hours.

[0049] Step 34, feeding: The mixture of crystallized sugar paste and centrifugal mother liquor is fed into the centrifugal feeding tank 2 through the feeding pipe 6, and then transported to the centrifuge 3 through the centrifugal feeding tank 2.

[0050] Step 35, Centrifugation: Turn on centrifuge 3. The centrifuged hygroscopic sugar obtained by centrifugation will enter the next process to further prepare maltitol crystals. The centrifuged mother liquor will enter the centrifuged mother liquor tank 4 through the mother liquor feed pipe 9 for temporary storage.

[0051] The maltitol crystals prepared in this embodiment have a purity of over 98.5% and a centrifugal yield of 57.3%.

[0052] Comparative Example

[0053] The difference between this comparative example and Example 1 is that: in the cooling process, the cooling end temperature is 35°C; no mixing process is set up, and after cooling, the material is directly fed into the feeding and centrifugation processes. The remaining steps and conditions are the same as in Example 1.

[0054] The maltitol crystals prepared in this comparative example have a purity of over 98.5% and a centrifugal yield of 55.6%.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A maltitol cooling crystallization system, comprising a crystallization tank, a cooling system for cooling and crystallizing the maltitol stock solution contained within the crystallization tank into crystalline sugar paste, and a stock solution inlet, characterized in that, The system also includes a centrifugal feeding tank, a centrifuge, a centrifugal mother liquor tank, and a centrifugal pump. A sugar paste outlet and a mother liquor inlet are respectively provided on the crystallization cylinder. A discharge pipe is provided at the sugar paste outlet and connected to the inlet of the centrifugal feeding tank. The outlet of the centrifugal feeding tank is connected to the inlet of the centrifuge via a conveying pipe. The centrifuge is used to separate the crystallized sugar paste into centrifuged wet sugar and centrifugal mother liquor. The centrifuge is also provided with a mother liquor outlet and a wet sugar outlet. The centrifuged wet sugar is connected to the next process via the wet sugar outlet. A mother liquor feed pipe is provided at the mother liquor outlet and connected to the inlet of the centrifugal mother liquor tank. The centrifugal mother liquor tank is used to collect the centrifugal mother liquor. The outlet of the centrifugal mother liquor tank is connected to the mother liquor inlet of the crystallization cylinder via the centrifugal mother liquor feed pipe. The centrifugal pump is located on the centrifugal mother liquor feed pipe.

2. The maltitol cooling crystallization system as described in claim 1, characterized in that, A steam pipe is also installed at the feed end of the centrifugal feeding tank, and a steam pneumatic valve is installed on the steam pipe. The steam pipe is connected to an external clean steam source, and the steam is used to clear the blockage of crystalline sugar paste in the centrifugal feeding tank.

3. The maltitol cooling crystallization system as described in claim 1, characterized in that, A discharge pneumatic valve is installed on the discharge pipe.

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