Preparation method of high-granularity anti-caking xylose crystals

Abstract

This invention relates to a method for preparing high-particle-size, anti-caking xylose crystals, comprising a sugar boiling process, a cooling crystallization process, a centrifugation process, and a drying process. This invention improves the sugar boiling process to increase the particle size of the generated xylose crystals and improves the cooling crystallization process to stabilize the cooling rate and ensure stable crystal growth, thereby preparing high-particle-size, anti-caking xylose crystals. Compared to existing processes, the production cycle of this invention is significantly shortened from over 100 hours per batch to 50 hours, and the quality of the xylose crystal product is greatly improved. The xylose crystal product prepared using this method has an average particle size of 30-80 mesh accounting for more than 50%, and it does not clump or change within 6 months of storage, allowing for long-term transportation.

Description

Technical Field

[0001] This invention belongs to the field of sugar alcohol preparation technology, and specifically relates to a method for preparing high-particle-size, anti-caking xylose crystals. Background Technology

[0002] Xylose and arabinose both belong to the pentose sugar family and are monosaccharides. Industrially produced xylose is a fine needle-like crystal. Currently, the only method to obtain xylose is by hydrolyzing xylan with acid, but this results in low-particle-size xylose crystals that are prone to clumping, making them difficult to transport and store. Existing technologies produce xylose crystals with a particle size of 30-80 mesh accounting for less than 45%. This fine-particle xylose product will clump after a period of storage, making long-term storage and transportation impossible, severely impacting sales and reducing profits. Patent CN115044713A discloses a method for controlling the high-particle-size refining process of semi-cellulose xylose, achieved by extending the cooling time by 70-55°C. While ensuring high-particle-size xylose crystals, this significantly extends the production cycle and reduces production efficiency. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a method for preparing high-particle-size, anti-caking xylose crystals. In the production control of xylose crystals, the main parameters of the sugar boiling process and the cooling crystallization process are precisely adjusted to ensure that the prepared xylose crystals do not clump during storage.

[0004] This invention is achieved by providing a method for preparing high-particle-size, anti-caking xylose crystals, comprising the following steps:

[0005] (1) Sugar boiling process: Vacuum boiling is carried out on xylose stock solution with a refractive index of 66% to 68% and a xylose content of 71.85% or higher. The initial material is fed to a liquid level of 40%, the vacuum degree is controlled at -80 to -90 kPa, the boiling temperature is 65℃, and the boiling process begins. When the refractive index of the xylose stock solution reaches 79.5%, 50g of xylose seed crystals with a mesh size of 100 mesh is added to the seed funnel. The manual valve is opened to allow the xylose seed crystals to be sucked into the tank. When the refractive index reaches 80% after the xylose seed crystals are added, the material is replenished. The refractive index is kept constant, and the opening of the replenishment valve is not greater than 35%. When the liquid level reaches 60%, the opening is reduced to below 20%. The material is gradually replenished when the liquid level reaches 65 to 65.2%. When the refractive index reaches 80.5%, the boiling process is stopped and the material is discharged to proceed to the next process. The time from adding the xylose seed crystals to discharging the material is controlled to be greater than 120 minutes.

[0006] (2) Cooling crystallization process: The xylose solution in step (1) is subjected to two stages of cooling and crystallization. First stage: The xylose solution is cooled at a rate of 0.5±0.05℃ / h before it reaches 50℃. Second stage: The xylose solution is cooled at a rate of 0.85~1.05℃ / h after it reaches 50℃ until it reaches below 40℃ and enters the next process.

[0007] (3) Centrifugation process: The xylose solution in step (2) is centrifuged to obtain high-particle-size xylose molasses;

[0008] (4) Drying process: The xylose in step (3) is dried to obtain a high-particle xylose product with a moisture content of less than 0.1%.

[0009] Compared with existing technologies, the method for preparing high-particle-size, anti-caking xylose crystals of the present invention improves the sugar boiling process to increase the particle size of the generated xylose crystals and improves the cooling crystallization process to stabilize the cooling rate and ensure stable crystal growth. This results in the preparation of high-particle-size, anti-caking xylose crystals. Compared with existing processes, the production cycle of the method of the present invention is significantly shortened from over 100 hours per batch to 50 hours, and the quality of the xylose crystal product is greatly improved. The xylose crystal product prepared using the method of the present invention has an average particle size of 30-80 mesh accounting for more than 50%, and it does not clump or change within 6 months of storage, allowing for long-term transportation. Detailed Implementation

[0010] To make the technical problems, solutions, and beneficial effects of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0011] A preferred embodiment of the method for preparing high-particle-size, anti-caking xylose crystals of the present invention includes the following steps:

[0012] (1) Sugar boiling process: Vacuum boiling is carried out on xylose stock solution with a refractive index of 66% to 68% and a xylose content of 71.85% or higher. The initial material is fed to a liquid level of 40%, the vacuum degree is controlled at -80 to -90 kPa, the boiling temperature is 65℃, and the boiling process begins. When the refractive index of the xylose stock solution reaches 79.5%, 50g of xylose seed crystals with a mesh size of 100 is added to the seed funnel. The manual valve is opened to allow the xylose seed crystals to be sucked into the tank. When the refractive index reaches 80% after the xylose seed crystals are added, the material is replenished. The refractive index is kept constant, and the opening of the replenishment valve is not greater than 35%. When the liquid level reaches 60%, the opening is reduced to below 20%. The material is gradually replenished when the liquid level reaches 65 to 65.2%. When the refractive index reaches 80.5%, the boiling process is stopped and the material is discharged to proceed to the next process. The time from adding the xylose seed crystals to discharging the material is controlled to be greater than 120 minutes.

[0013] (2) Cooling crystallization process: The xylose solution in step (1) is cooled and crystallized in two stages. First stage: the xylose solution is cooled to 50℃ and the cooling rate is maintained at 0.5±0.05℃ / h. Second stage: after the xylose solution is cooled to 50℃, the cooling rate is maintained at 0.85~1.05℃ / h until it is below 40℃ and then enters the next process.

[0014] (3) Centrifugation process: The xylose solution in step (2) is centrifuged to obtain high-particle-size xylose molasses.

[0015] (4) Drying process: The xylose in step (3) is dried to obtain a high-particle xylose product with a moisture content of less than 0.1%.

[0016] The preparation method of high-particle-size anti-caking xylose crystals of the present invention is further illustrated below through specific embodiments and comparative examples.

[0017] Example 1

[0018] A first embodiment of the method for preparing high-particle-size, anti-caking xylose crystals of the present invention includes the following steps:

[0019] (11) Sugar boiling process: Vacuum boiling is carried out on xylose stock solution with a refractive index of 66.0% and a xylose content of 70.00%. The initial material is fed to a liquid level of 40%, the vacuum degree is controlled at -80 to -90 kPa, the boiling temperature is 65℃, and the boiling process begins. When the refractive index of the xylose stock solution reaches 79.5%, 50g of xylose seed crystals with a mesh size of 100 is added to the seed funnel. The manual valve is opened to allow the xylose seed crystals to be sucked into the tank. When the refractive index reaches 80% after the xylose seed crystals are added, the material is replenished. The refractive index remains unchanged, and the opening of the replenishment valve is not greater than 35%. When the liquid level reaches 60%, the opening is reduced to below 20%. The material is gradually replenished when the liquid level reaches 65.2%. When the refractive index reaches 80.5%, the boiling process is stopped and the material is discharged to proceed to the next process. The time from adding the xylose seed crystals to discharging the material is controlled to be greater than 127 minutes.

[0020] (12) Cooling and crystallization process: The xylose solution in step (11) is cooled and crystallized in two stages. First stage: The xylose solution is cooled to 50℃ and the cooling rate is maintained at 0.51℃ / h. Second stage: The xylose solution is cooled to 50℃ and the cooling rate is maintained at 0.85℃ / h until it is below 40℃ and then enters the next process.

[0021] (13) Centrifugation process: Centrifuge the xylose solution in step (12) to obtain high-particle-size xylose molasses.

[0022] (14) Drying process: The xylose in step (13) is dried to obtain a high-particle xylose product with a moisture content of less than 0.1%.

[0023] In this embodiment, a high-particle-size xylose crystal product with a particle size of 30-80 mesh accounting for 50.4% was prepared. The production cycle was 52 hours, and the xylose crystals were observed to not clump within 6 months of storage.

[0024] Example 2

[0025] A second embodiment of the method for preparing high-particle-size, anti-caking xylose crystals of the present invention includes the following steps:

[0026] (21) Sugar boiling process: Vacuum boiling is carried out on xylose stock solution with a refractive index of 66.3% and a xylose content of 72.88%. The initial material is fed to a liquid level of 40%, the vacuum degree is controlled at -80 to -90 kPa, the boiling temperature is 65℃, and the boiling process begins. When the refractive index of the xylose stock solution reaches 79.5%, 50g of xylose seed crystals with a mesh size of 100 is added to the seed funnel. The manual valve is opened to allow the xylose seed crystals to be sucked into the tank. When the refractive index reaches 80% after the xylose seed crystals are added, the material is replenished. The refractive index remains unchanged, and the opening of the replenishment valve is not greater than 35%. When the liquid level reaches 60%, the opening is reduced to below 20%. The material is gradually replenished when the liquid level reaches 65.1%. When the refractive index reaches 80.5%, the boiling process is stopped and the material is discharged to proceed to the next process. The time from adding the xylose seed crystals to discharging the material is controlled to be greater than 127 minutes.

[0027] (22) Cooling and crystallization process: The xylose solution in step (21) is cooled and crystallized in two stages. First stage: the xylose solution is cooled to 50℃ and the cooling rate is maintained at 0.55℃ / h. Second stage: the xylose solution is cooled to 50℃ and the cooling rate is maintained at 1.01℃ / h until it is below 25.1℃ and then enters the next process.

[0028] (23) Centrifugation process: Centrifuge the xylose solution in step (22) to obtain high-particle-size xylose molasses.

[0029] (24) Drying process: The xylose in step (23) is dried to obtain a high-particle xylose product with a moisture content of less than 0.1%.

[0030] In this embodiment, a high-particle-size xylose crystal product with a particle size of 30-80 mesh accounting for 61.1% was prepared. The production cycle was 55 hours, and the xylose crystals were observed to not clump within 6 months of storage.

[0031] Example 3

[0032] A third embodiment of the method for preparing high-particle-size, anti-caking xylose crystals of the present invention includes the following steps:

[0033] (31) Sugar boiling process: Vacuum boiling is carried out on xylose stock solution with a refractive index of 68.0% and a xylose content of 74.55%. The initial material is fed to a liquid level of 40%, the vacuum degree is controlled at -80 to -90 kPa, the boiling temperature is 65℃, and the boiling process begins. When the refractive index of the xylose stock solution reaches 79.5%, 50g of xylose seed crystals with a mesh size of 100 is added to the seed funnel. The manual valve is opened to allow the xylose seed crystals to be sucked into the tank. When the refractive index reaches 80% after the xylose seed crystals are added, the material is replenished. The refractive index remains unchanged, and the opening of the replenishment valve is not greater than 35%. When the liquid level reaches 60%, the opening is reduced to below 20%. The material is gradually replenished when the liquid level reaches 65%. When the refractive index reaches 80.5%, the boiling process is stopped and the material is discharged to enter the next process. The time from adding the xylose seed crystals to discharging the material is controlled to be greater than 130 minutes.

[0034] (32) Cooling and crystallization process: The xylose solution in step (31) is cooled and crystallized in two stages. First stage: the xylose solution is cooled to 50℃ and the cooling rate is maintained at 0.45℃ / h. Second stage: the xylose solution is cooled to 50℃ and the cooling rate is maintained at 1.05℃ / h until it is below 26.8℃ and then enters the next process.

[0035] (33) Centrifugation process: Centrifuge the xylose solution in step (32) to obtain high-particle-size xylose molasses.

[0036] (34) Drying process: The xylose in step (33) is dried to obtain a high-particle xylose product with a moisture content of less than 0.1%.

[0037] In this embodiment, a high-particle-size xylose crystal product with a particle size of 30-80 mesh accounting for 71.5% was prepared. The production cycle was 55 hours, and the xylose crystals were observed to not clump within 6 months of storage.

[0038] Comparative Example 1

[0039] The first comparative example of the present invention, wherein the method for preparing xylose crystals comprises the following steps:

[0040] (41) Sugar boiling process: Vacuum boiling is carried out on the xylose stock solution with a refractive index of 68.3% and a xylose content of 74.22%. The initial material is fed to a liquid level of 40%, the vacuum degree is controlled at -80 to -90 kPa, the boiling temperature is 65℃, and the boiling process begins. When the refractive index of the xylose stock solution reaches 79.5%, 30g of xylose seed crystals with a 100-mesh content of 30% are added to the seed funnel. The manual valve is opened to allow the xylose seed crystals to be sucked into the tank. When the refractive index reaches 80% after the xylose seed crystals are added, the material is replenished. The refractive index remains unchanged, and the opening of the replenishment valve is not greater than 35%. When the liquid level reaches 60%, the opening is reduced to below 20%. The material is gradually replenished when the liquid level reaches 64.4%. When the refractive index reaches 80.5%, the boiling process is stopped and the material is discharged to enter the next process. The time from adding the xylose seed crystals to discharging the material is controlled to be greater than 108 minutes.

[0041] (42) Cooling and crystallization process: The xylose solution in step (41) is cooled and crystallized in two stages. First stage: The xylose solution is cooled to 50℃ and the cooling rate is maintained at 0.31℃ / h. Second stage: The xylose solution is cooled to 50℃ and the cooling rate is maintained at 0.31℃ / h until it is below 33.5℃ and then enters the next process.

[0042] (43) Centrifugation process: Centrifuge the xylose solution in step (42) to obtain high-particle-size xylose molasses.

[0043] (44) Drying process: The xylose in step (43) is dried to obtain a finished xylose product with a moisture content of less than 0.1%.

[0044] In this comparative example, a low-particle-size xylose crystal product with a particle size of 30-80 mesh accounting for 23.2% was prepared. The production cycle was 103 hours. After two months of storage, clumping occurred.

[0045] Comparative Example 2

[0046] The second comparative example of the present invention describes a method for preparing xylose crystals comprising the following steps:

[0047] (51) Sugar boiling process: Vacuum boiling is carried out on xylose stock solution with a refractive index of 68.3% and a xylose content of 74.07%. The initial material is fed to a liquid level of 40%, the vacuum degree is controlled at -80 to -90 kPa, the boiling temperature is 65℃, and the boiling process begins. When the refractive index of the xylose stock solution reaches 79.5%, 100g of xylose seed crystals with a ratio of 30% at 100 mesh is added to the seed funnel. The manual valve is opened to allow the xylose seed crystals to be sucked into the tank. When the refractive index reaches 80% after the xylose seed crystals are added, the material is replenished. The refractive index remains unchanged, and the opening of the replenishment valve is not greater than 35%. When the liquid level reaches 60%, the opening is reduced to below 20%. The material is gradually replenished when the liquid level reaches 65.1%. When the refractive index reaches 80.5%, the boiling process is stopped and the material is discharged to enter the next process. The time from adding the xylose seed crystals to discharging the material is controlled to be greater than 123 minutes.

[0048] (52) Cooling and crystallization process: The xylose solution in step (51) is cooled and crystallized in two stages. First stage: The xylose solution is cooled to 50℃ and the cooling rate is maintained at 0.35℃ / h. Second stage: The xylose solution is cooled to 50℃ and the cooling rate is maintained at 0.35℃ / h until it is below 30.0℃ and then enters the next process.

[0049] (53) Centrifugation process: The xylose solution in step (52) is centrifuged to obtain high-particle-size xylose molasses.

[0050] (54) Drying process: The xylose in step (53) is dried to obtain a finished xylose product with a moisture content of less than 0.1%.

[0051] In this comparative example, a low-particle-size xylose crystal product with a particle size of 30-80 mesh accounting for 35.2% was prepared. The production cycle was 102 hours, and clumping occurred after 3 months of storage.

[0052] Comparative Example 3

[0053] The third comparative example of the present invention describes a method for preparing xylose crystals comprising the following steps:

[0054] (61) Sugar boiling process: Vacuum boiling is carried out on xylose stock solution with a refractive index of 69.0% and a xylose content of 72.58%. The initial material is fed to a liquid level of 40%, the vacuum degree is controlled at -80 to -90 kPa, the boiling temperature is 65℃, and the boiling process begins. When the refractive index of the xylose stock solution reaches 79.5%, 50g of xylose seed crystals with a ratio of 30% at 100 mesh is added to the seed funnel. The manual valve is opened to allow the xylose seed crystals to be sucked into the tank. When the refractive index reaches 79.8% after the xylose seed crystals are added, the material is replenished. The refractive index remains unchanged, and the opening of the replenishment valve is not greater than 35%. When the liquid level reaches 60%, the opening is reduced to below 20%. The material is gradually replenished when the liquid level reaches 65.1%. When the refractive index reaches 80.5%, the boiling process is stopped and the material is discharged to enter the next process. The time from adding the xylose seed crystals to discharging the material is controlled to be greater than 93 minutes.

[0055] (62) Cooling and crystallization process: The xylose solution in step (61) is cooled and crystallized in two stages. First stage: The xylose solution is cooled to 50℃ and the cooling rate is maintained at 0.33℃ / h. Second stage: The xylose solution is cooled to 50℃ and the cooling rate is maintained at 0.33℃ / h until it is below 28.8℃ and then enters the next process.

[0056] (63) Centrifugation process: Centrifuge the xylose solution in step (62) to obtain high-particle-size xylose molasses.

[0057] (64) Drying process: The xylose in step (63) is dried to obtain a finished xylose product with a moisture content of less than 0.1%.

[0058] In this comparative example, a low-particle-size xylose crystal product with a particle size of 30-80 mesh accounting for 43.4% was prepared. The production cycle was 111 hours. After 3 months of storage, clumping occurred.

[0059] In summary, Table 1 below shows the comparison of parameters between each embodiment and the comparative example.

[0060] Table 1. Comparison of process parameters between each embodiment and comparative example

[0061]

[0062] As shown in the comparison table, the xylose crystals produced in each embodiment have a high particle size and do not clump within 6 months, allowing for long-term storage and transportation. The xylose crystals produced in each comparative example (i.e., the original production process) have a long production cycle, low particle size, and quickly clump, affecting product quality.

[0063] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions 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 method for preparing high-particle-size, anti-caking xylose crystals, characterized in that, Includes the following steps: (1) Sugar boiling process: Vacuum boiling is carried out on xylose stock solution with a refractive index of 66%~68% and a xylose content of 71.85% or higher. The initial material is fed to 40% liquid level, the vacuum degree is controlled at -80~-90kPa, the boiling temperature is 65℃, and the boiling process begins. When the refractive index of the xylose stock solution reaches 79.5%, 50g of xylose seed crystals with a mesh size of 100 is added to the seed funnel. The manual valve is opened to allow the xylose seed crystals to be sucked into the tank. When the refractive index reaches 80% after the xylose seed crystals are added, the material is replenished. The refractive index remains unchanged, and the opening of the replenishment valve is not greater than 35%. When the liquid level reaches 60%, the opening is reduced to below 20%. The material is gradually replenished when the liquid level reaches 65~65.2%. When the refractive index reaches 80.5%, the boiling process is stopped and the material is discharged to enter the next process. The time from adding the xylose seed crystals to discharging the material is controlled to be greater than 120 minutes. (2) Cooling crystallization process: The xylose solution in step (1) is subjected to two stages of cooling and crystallization. First stage: The xylose solution is cooled at a rate of 0.5±0.05℃ / h before it reaches 50℃. Second stage: The xylose solution is cooled at a rate of 0.85~1.05℃ / h after it reaches 50℃ until it reaches below 40℃ and enters the next process. (3) Centrifugation process: The xylose solution in step (2) is centrifuged to obtain high-particle-size xylose molasses; (4) Drying process: The xylose in step (3) is dried to obtain a high-particle xylose product with a moisture content of less than 0.1%.

2. The method for preparing high-particle-size, anti-caking xylose crystals as described in claim 1, characterized in that, The preparation method includes the following steps: (11) Sugar boiling process: Vacuum boiling is carried out on xylose stock solution with a refractive index of 66.0% and a xylose content of 71.85%. The initial material is fed to 40% liquid level, the vacuum degree is controlled at -80~-90kPa, the boiling temperature is 65℃, and the boiling process begins. When the refractive index of the xylose stock solution reaches 79.5%, 50g of xylose seed crystals with a mesh size of 100 is added to the seed funnel. The manual valve is opened to allow the xylose seed crystals to be sucked into the tank. When the refractive index reaches 80% after the xylose seed crystals are added, the material is replenished. The refractive index remains unchanged, and the opening of the replenishment valve is not greater than 35%. When the liquid level reaches 60%, the opening is reduced to below 20%. The material is gradually replenished when the liquid level reaches 65.2%. When the refractive index reaches 80.5%, the boiling process is stopped and the material is discharged to enter the next process. The time from adding the xylose seed crystals to discharging the material is controlled to be greater than 127 minutes. (12) Cooling and crystallization process: The xylose solution in step (1) is cooled and crystallized in two stages. First stage: the xylose solution is cooled to 50℃ and the cooling rate is maintained at 0.51℃ / h. Second stage: the xylose solution is cooled to 50℃ and the cooling rate is maintained at 0.85℃ / h until it is below 40℃ and then enters the next process. (13) Centrifugation process: The xylose solution in step (2) is centrifuged to obtain high-particle-size xylose molasses; (14) Drying process: The xylose in step (3) is dried to obtain a high-particle xylose product with a moisture content of less than 0.1%.

3. The method for preparing high-particle-size, anti-caking xylose crystals as described in claim 1, characterized in that, The preparation method includes the following steps: (21) Sugar boiling process: Vacuum boiling is carried out on xylose stock solution with a refractive index of 66.3% and a xylose content of 72.88%. The initial material is fed to a liquid level of 40%, the vacuum degree is controlled at -80~-90kPa, the boiling temperature is 65℃, and the boiling process begins. When the refractive index of the xylose stock solution reaches 79.5%, 50g of xylose seed crystals with a mesh size of 100 is added to the seed funnel. The manual valve is opened to allow the xylose seed crystals to be sucked into the tank. When the refractive index reaches 80% after the xylose seed crystals are added, the material is replenished. The refractive index remains unchanged, and the opening of the replenishment valve is not greater than 35%. When the liquid level reaches 60%, the opening is reduced to below 20%. The material is gradually replenished when the liquid level reaches 65.1%. When the refractive index reaches 80.5%, the boiling process is stopped and the material is discharged to enter the next process. The time from adding the xylose seed crystals to discharging the material is controlled to be greater than 127 minutes. (22) Cooling crystallization process: The xylose solution in step (1) is subjected to two stages of cooling and crystallization. First stage: The xylose solution is cooled at a rate of 0.55℃ / h before it reaches 50℃. Second stage: The xylose solution is cooled at a rate of 1.01℃ / h after it reaches 50℃ until it reaches below 25.1℃ and enters the next process. (23) Centrifugation process: The xylose solution in step (2) is centrifuged to obtain high-particle-size xylose molasses; (24) Drying process: The xylose in step (3) is dried to obtain a high-particle xylose product with a moisture content of less than 0.1%.

4. The method for preparing high-particle-size, anti-caking xylose crystals as described in claim 1, characterized in that, The preparation method includes the following steps: (31) Sugar boiling process: Vacuum boiling is carried out on xylose stock solution with a refractive index of 68.0% and a xylose content of 74.55%. The initial material is fed to 40% liquid level, the vacuum degree is controlled at -80~-90kPa, the boiling temperature is 65℃, and the boiling process begins. When the refractive index of the xylose stock solution reaches 79.5%, 50g of xylose seed crystals with a mesh size of 100 is added to the seed funnel. The manual valve is opened to allow the xylose seed crystals to be sucked into the tank. When the refractive index reaches 80% after the xylose seed crystals are added, the material is replenished. The refractive index remains unchanged, and the opening of the replenishing valve is not greater than 35%. When the liquid level reaches 60%, the opening is reduced to below 20%. The material is gradually replenished when the liquid level reaches 65%. When the refractive index reaches 80.5%, the boiling process is stopped and the material is discharged to enter the next process. The time from adding the xylose seed crystals to discharging the material is controlled to be greater than 130 minutes. (32) Cooling crystallization process: The xylose solution in step (1) is subjected to two stages of cooling and crystallization. First stage: The xylose solution is cooled at a rate of 0.45℃ / h before it reaches 50℃. Second stage: The xylose solution is cooled at a rate of 1.05℃ / h after it reaches 50℃ until it reaches below 26.8℃ and enters the next process. (33) Centrifugation process: The xylose solution in step (2) is centrifuged to obtain high-particle-size xylose molasses; (34) Drying process: The xylose in step (3) is dried to obtain a high-particle xylose product with a moisture content of less than 0.1%.

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