Xylitol refining crystallization process

A technology of xylitol and crystallizer, which is applied in the field of xylitol refining and crystallization, can solve the problems of unreasonable process operation parameters, wide particle size distribution, poor fluidity, etc., and achieve smooth product surface, concentrated particle size distribution, and good product quality Effect

Inactive Publication Date: 2006-02-22
TIANJIN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, in the production of xylitol refined crystallization, due to the unreasonable process operation parameters, the seed crystals are put in according to experience, and there is no theoretical and experimental basis for the seed crystal temperature, seed crystal amount and seed crystal particle size.
The cooling rate of cooling and crystallization is 1°C / hr, and the crystallization operation cycle is more than 30 hours, which limits the production capacity of the equipment
The existence of the above unfavorable factors leads to low purity of the final xylitol crystal product, small primary particle size, wide particle size distribution, poor crystal shape, poor fluidity and easy bonding

Method used

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  • Xylitol refining crystallization process
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  • Xylitol refining crystallization process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The chromatographic content is 90% (wt%), the concentration is 607g of xylitol feed solution that is 89% (wt%) and is poured into the crystallizer at 80 ℃, and starts cooling crystallization process, and the stirring speed of the process is controlled at 400rpm. When the temperature of the crystallization feed liquid is higher than 64°C, the cooling rate is controlled at 10°C / hr, and then 2°C / hr. When the temperature drops to 62°C, add 2.04g of seed crystals with a particle size of 300μm, and restart the cooling process after growing the crystals at a constant temperature for 15 minutes. Control the cooling rate to 7°C / hr, and stop the crystallization when the temperature drops to 38°C process. The crystal slurry was taken out and centrifuged at 1000rpm for 20 minutes with a centrifuge, and the product was washed with 20ml of water. The wet product was dried at 60°C for 5 hours. 338g of xylitol crystal product was obtained with a yield of 62.6%. The crystal surface i...

Embodiment 2

[0026] Pour 688g of xylitol raw material solution with a chromatographic content of 95% and a concentration of 85% into a crystallizer at 75°C, and start the cooling and crystallization process. The stirring speed is controlled at 280rpm, and the cooling rate is controlled at 6°C / hr. When the temperature drops to 55°C, add 1.38g of seed crystals with a particle size of 150μm, and restart the cooling process after growing the crystals at a constant temperature for 40 minutes. Control the cooling rate at 8°C / hr, and stop the crystallization when the temperature drops to 30°C process. The crystal slurry was taken out and centrifuged at 1500rpm for 13 minutes with a centrifuge, and the product was washed with 30ml of ethanol. Dry the wet product at 70°C for 3 hours. Obtained 369g of xylitol crystal product with a yield of 62.4%. The crystal surface is smooth, the main particle size is 430μm, and the purity is 99.7%.

Embodiment 3

[0028] Pour 669g of xylitol feed solution with chromatographic content of 97% and concentration of 88% into the crystallizer at 75°C, and start the cooling and crystallization process, and the stirring speed during the process is controlled at 150rpm. When the feed liquid temperature is higher than 66°C, the cooling rate is controlled at 8°C / hr, and then 3°C / hr. When the temperature drops to 64°C, add 11.38g of seed crystals with a particle size of 200μm, grow the crystals at a constant temperature for 25 minutes, then restart the cooling process, control the cooling rate to 6°C / hr, and stop the crystallization when the temperature drops to 35°C process. The crystal slurry was taken out and centrifuged at 2000 rpm for 5 minutes with a centrifuge, and the product was washed with 30 ml of ethanol-water with an ethanol concentration of 30%. The wet product was dried at 80°C for 1 hour. Obtained 380g of xylitol crystal product, yield 64.4%. The main crystal particle size of the...

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Abstract

The invention relates to refine crystallization method for xylitol. Wherein, conveying the xylitol solution with mass concentration of 85-92% into crystallizer with original temperature of 65-85Deg; cooling and crystallizing; adding crystal seed to control refine crystallizing nucleation at temperature of 55-70Deg, holding for 15-60min; controlling cooling rate between 1Deg/hr-10Deg/hr during the process; the crystallization temperature is 30-45Deg, and the operation time is less than ten hours; centrifugal separating, cleaning, drying for 1-8h at temperature of 40-80Deg, finally, one obtains the product.

Description

technical field [0001] The invention belongs to the technical field of crystallization, in particular to a method for refining and crystallizing xylitol. Background technique [0002] Xylitol (Xylitol), scientific name pentapentyl alcohol, is a five-hydroxy polyol. Because it is first made from birch bark, it is commonly known as xylitol. The molecular formula of xylitol is C 5 h 12 o 5 , the molecular weight is 152.14, the melting point is 92 ° C ~ 96 ° C, the crystal is very soluble in water, the solubility in water at 20 ° C is about 16.8g / 100g, the chemical stability is good, hygroscopic, and it is a white orthorhombic under normal conditions Crystalline or crystalline powder, it has a unique refreshing feeling when eaten. [0003] Xylitol is a normal intermediate of carbohydrate metabolism in the human body and one of the indispensable substances in human life activities. It has been identified as a grade A (safety grade) food additi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/26C07C29/78
Inventor 王静康侯宝红朱路甲张美景靳建龙
Owner TIANJIN UNIV
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