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Learn - Tuesday 20, 2020
As a Sucralose Manufacturer, share with you.
Neutralization and deacidification
The neutralization and deacidification process is to use the neutralization method when purifying the hydrolysate. In the 1960s, when my country's xylitol started trial production in Baoding, this method was used, such as the No. 1 production line of the Baoding factory. The process route of this method is as follows: raw material → hydrolysis → neutralization → concentration → decolorization → ion exchange → concentration → hydrogenation → concentration → crystallization → separation → packaging
This is a typical xylitol production process. In the purification process of the hydrolysate, a neutralization and an ion exchange process are adopted. On the basis of this process, a hydrogenation liquid ion exchange is added to become a neutralization process. The secondary exchange processes for deacidification are all neutralization deacidification processes. We know that in the production process of xylitol, corncobs must first be hydrolyzed to produce a hydrolysate, and a catalyst—sulfuric acid is added during the hydrolysis. After the hydrolysis, sulfuric acid is present in the hydrolysate. Removal, as the name implies, the neutralization and deacidification process is to remove the acid by neutralization. The neutralizer is usually calcium carbonate. Sulfuric acid is neutralized by calcium carbonate to form gypsum—calcium sulfate. The solubility of calcium sulfate in water is very small, and most of the gypsum becomes precipitate and removed by filtration.
The advantages and disadvantages of the neutralization and deacidification process: the neutralization and deacidification process is relatively simple, with low acid and alkali consumption, which can reduce costs, and the equipment is relatively simple, easy to operate, and low investment. But because it is an initial process, it must have shortcomings. Its shortcomings mainly come from the process itself. As we all know, although the solubility of gypsum in water is small, it is not absolutely insoluble. When entering the next concentration process, the hydrolysate When it becomes thicker, the concentration of gypsum in the hydrolyzate will also increase and become supersaturated. At this time, a part of gypsum will precipitate out again and deposit on the tube wall of the evaporator to form a thermal insulation layer, which reduces the evaporation efficiency, wastes steam, and reduces Equipment utilization. Because this layer of scale is difficult to remove, especially difficult to remove by chemical methods, it has to be removed mechanically, which is not only troublesome, but also labor-intensive. It also damages the equipment to varying degrees and reduces the service life of the equipment.
In order to solve the confusion caused by neutralization and deacidification, scientific and technological workers and manufacturers have made unremitting efforts to research and develop new ion exchange deacidification processes, such as the No. 2 production line of Baoding Plant. Ion exchange deacidification process is to use ion exchange resin to remove sulfate by ion exchange. This process also has two exchanges and three exchanges, but both two exchanges and three exchanges belong to the category of ion exchange.
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