Views: 38 Author: Site Editor Publish Time: 2023-07-06 Origin: Site
The purpose of decolorization treatment in sugar refining is to obtain high-quality refined sugar products. Raw sugar juice or syrup often contains impurities and colored compounds that give the sugar products undesirable color and taste. The goal of decolorization treatment is to remove these undesirable pigments and impurities, making the sugar product meet the market's quality standards.
Two techniques can be used for refining sugar from raw sugar: one is using activated carbon, and the other is using ion exchange resin. Some sugar factories use activated carbon to remove color from sugar solutions. In this process, raw sugar is re-dissolved, and the white sugar degree reaches 60-65 degrees, treated with phosphates first, and then processed with activated carbon. The processed syrup is concentrated and crystallized to produce refined sugar. The cost of various activated carbon methods commonly used in sugar factories has been continuously increasing. Therefore, it is necessary to find an alternative method to decolorize the syrup.
Compared to the activated carbon method, the application of ion exchange resin as an effective and environmentally friendly alternative for sugar decolorization is becoming more and more popular. Therefore, an increasing number of sugar factories are using ion exchange resin for decolorization of syrup.
The ion exchange resin used for sugar refining is a large-pore strong base anion exchange resin (Type I), existing in the form of chloride ions. The principle of decolorization by ion exchange is as follows:
RN+ (CH3)3 Cl- + CA → RN+ (CH3)3 A- + CCl
The resin used for sugar decolorization has a high porosity, ensuring the adsorption of high molecular weight colorants. In addition to functional groups and structure, the properties of the polymer play a very important role in resin decolorization.
Improved decolorization efficiency:
Ion exchange resins have higher decolorization efficiency compared to traditional methods. These resins have high affinity for colorants and impurities in sugar solution. When the sugar solution passes through the resin bed, the resin selectively adsorbs and removes the color compounds, significantly reducing color intensity and improving the quality of sugar.
Selective removal of impurities:
Ion exchange resins can not only selectively remove colorants but also remove various impurities such as heavy metals, organic acids, and residual proteins. By targeting specific impurities, the resin helps improve the overall purity of the sugar product. This selective removal ensures that the final refined sugar meets the strict quality standards set by the industry.
Cost reduction through regeneration:
One major advantage of ion exchange resin is its regenerability, allowing for multiple uses. When the resin reaches its saturation point, it can be regenerated using appropriate regenerants such as acid or alkali solutions. The regeneration process restores the adsorption capacity of the resin, reducing costs and minimizing the need for frequent resin replacement.
Compared to traditional decolorization methods, ion exchange resin offers better sustainability. Activated carbon and bone char commonly used in the sugar industry generate a significant amount of waste that needs to be disposed of. In contrast, ion exchange resin generates less waste and can be regenerated and reused, reducing environmental impact and promoting a more environmentally friendly sugar production process.
Easy integration into existing processes:
Ion exchange resin can be easily integrated into existing sugar refining processes. They can be used in batch or continuous operations, providing flexibility in implementation. The resin can be used at various stages of the sugar decolorization process, such as raw juice treatment, carbonation, or syrup clarification, providing efficient decolorization throughout the production line.
Our company has a type of ion exchange resin that is highly suitable for decolorizing sugar syrup. It is a large-pore styrene-based strong base anion exchange resin provided in the form of chloride ions. It can be used in high-temperature environments (60-70°C), which are common in sugar factories.