Secondary crystallization process for xylose

Abstract

The present invention discloses a secondary crystallization technique of xylose, which belongs to the techinical field of functional sugar production. The technique includes the following processes: xylose massecuite is infused into a crystallization pot, and when the infused volume reaches 80 percent to 85 percent of the capacity of the crystallization pot, infusion is stopped; when the temperature is naturally decreased to 80 DEG C, the xylose massecuite is stirred for two hours while the temperature is kept; afterwards, the temperature of the xylose massecuite is reduced at 1 DEG C per hour, and when the temperature reaches 75 DEG C, tiny crystal grains are formed in the xylose massecuite; at the moment, the residual xylose massecuite, which accounts for 20 percent to 15 percent of the capacity of the crystallization pot, is infused into the crystallization pot and uniformly mixed, so that the newly added xylose massecuite is sufficiently mixed with the xylose massecuite with the formed tiny crystal grains; then, when the temperature is naturally reduced to 75 DEG C, the xylose massecuite is stirred for three hours while the temperature is kept; the temperature is decreased again according to the speed rate of 1 DEG C per hour, and when the temperature reaches 30 DEG C to 40 DEG C, crystallization is finished; and centrifugation operation is carried out. Compared with the prior art, the secondary crystallization technique of xylose is characterized by simple operation, high crystallization yield, low production cost, and the like.

Description

technical field [0001] The invention relates to the technical field of functional sugar production, in particular to a xylose secondary crystallization process. Background technique [0002] Xylose is mainly a functional sugar product prepared from corncobs, bagasse and other agricultural and sideline products through hydrolysis, purification, evaporation, crystallization, centrifugation, drying and other processes. It is widely used in light industry, food, chemical and other industries. The crystallization process is an important link in the production of xylose. The traditional crystallization process is to put the massecuite into the crystallization tank, and then gradually cool down. Some crystal grains are precipitated. This process is cumbersome. When adding seed crystals, the timing must be grasped. If the timing is missed, the crystallization will be poor, the crystal grains are small, and the added seed crystals will not play their due role. Contents of the inven...

AI Technical Summary

Problems solved by technology

The crystallization process is an important link in the production of xylose. The traditional crystallization process is to put the massecuite into the crystallization tank, and then gradually cool down. Some crystal grains are precipitated. This process is cumbersome. When adding the seed crystals, the timing must be grasped. If the timing is missed, the crystallization will be poor, the crystal grains are small, and the added seed crystals will not play their due role.