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[Chemical Knowledge]：Manufacturing method and process of xylitol

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The manufacturing method
of xylitol
1. Introduction

Xylitol is an important chemical production raw material, widely used in food, medicine, cosmetics and other fields. Xylitol is widely used as a sweetener in the food industry due to its unique sweetness and low calorie properties. In addition, xylitol also has the effect of preventing dental caries and lowering blood sugar, so it is also widely used in the field of medicine. This article will introduce the manufacturing method of xylitol, including raw material selection, reaction principle, process flow, equipment selection and so on.

2. raw material selection

xylitol manufacturing raw materials are mainly corn cob, bagasse, cottonseed hulls and other agricultural and sideline products waste, these wastes are rich in xylan components. Among them, corncob is the most common raw material, because of its wide source, low price, so it is widely used in the production of xylitol.

3. reaction principle

the manufacture of xylitol is mainly through the acid hydrolysis or enzymatic hydrolysis of xylan in raw materials into xylose, and then through the hydrogenation reaction xylose into xylitol. The specific reaction principle is as follows:

1. Acidolysis: xylan in the raw material is hydrolyzed under acidic conditions to produce xylose and other by-products.
2. Enzymatic hydrolysis method: xylanase is used to hydrolyze xylan in raw materials to produce xylose.
3. Hydrogenation reaction: xylose in the presence of a catalyst and hydrogen addition reaction, the formation of xylitol.

4. Process
The manufacturing process of
xylitol mainly includes raw material treatment, hydrolysis, purification, hydrogenation, crystallization and other steps. The specific process is as follows:

1. raw material processing: the corncob and other raw materials are crushed and sieved to obtain the appropriate particle size.
2. Hydrolysis: The treated raw materials are added to the acidic or enzymatic solution, and the hydrolysis reaction is carried out at a certain temperature and time to generate xylose liquid.
3. Purification: neutralization, filtration and decolorization of the hydrolysate to remove impurities.
4. Hydrogenation: The purified xylose liquid is added into a hydrogenation reactor, and an addition reaction occurs with hydrogen under the action of a catalyst to generate xylitol liquid.
5. Crystallization: The hydrogenated xylitol liquid is cooled and crystallized to obtain xylitol crystals.

5. equipment selection

In the manufacturing process of xylitol, the equipment that needs to be used mainly includes pulverizer, screening machine, reactor, filter, decolorization tank, crystallization tank, etc. When selecting equipment, it is necessary to comprehensively consider factors such as production scale, product quality, operation and maintenance, and choose the equipment that suits you.

6. precautions

In the manufacturing process of xylitol, the following matters need to be paid attention to:

1. Control the conditions of hydrolysis and hydrogenation reactions, such as temperature, time, pH value, etc., to ensure the smooth progress of the reaction.
2. Strengthen the quality inspection of raw materials and products to ensure that the product quality meets the requirements.
3. Strengthen the maintenance and maintenance of equipment to ensure the normal operation and service life of equipment.

7. conclusion

xylitol as an important raw material for chemical production has broad application prospects. In the manufacturing process, it is necessary to select appropriate raw materials, control the reaction conditions, strengthen quality inspection and equipment maintenance, etc., to ensure the quality of the product and the smooth progress of production.

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