In the sugar decolorization industry, two kinds of materials are widely used, activated carbon and ion exchange resin.
1.1 activated carbon
Different materials and shapes of activated carbon are widely used in the market. Powder activated carbon (PAC: Powdered Activated Carbon) and granular activated carbon (GAC: Granular Activated Carbon) are commonly used for sugar juice decolorization.
1.2 Ion exchange resin
Ion exchange resin for sugar decolorization mainly include organic synthesis-type ion exchange resins and adsorption resins. Ion exchange resin manufacturers all provide decoloring resins with different substrates and functional groups. Currently there are three types of resins in the market. Based on the difference in hydrophobicity, the styrene matrix shows stronger hydrophobicity, while the acrylic and phenolic matrixes show better hydrophilicity. This hydrophilic and hydrophobic property has a very important influence on the decolorization effect.In addition to chemical structures, organic adsorbents also have some very important porous structures. All of these characteristics are important factors that affect the decolorization of resin in sugar juice.
Macroporous adsorption ion exchange resin for sugar decolorization are used in industrial decolorization. The characteristics of larger pores allow them to adsorb organic macromolecular pigments. On the current market, most organic adsorbents and ion exchange resins are spherical, but granular and powdery organic materials also have corresponding applications.
Depending on the natural properties of the pigments, they are more or less removed in the crystals. The pigments in the sugar solution come from a wide variety of sources. A lot of research aims to classify these pigments. They can be divided into two categories, natural pigments from sugarcane and pigments produced during the production of sugar juice. A large amount of pigment is removed in the sugar washing step (50%. Mass fraction) and the clarification step (40% mass fraction). The main characteristics of the pigments are hydrophobic (non-polar), which includes a large molecular weight range, and they exhibit an anionic form at high pH.
The feed pigment also determines the selection of the resin. The polymer resin with an aromatic matrix exhibits better pigment absorption properties. But this type of resin shows more irreversible organic contamination than the resin of the aliphatic acrylic matrix, so when the syrup color of the feed is low (below 1000IU), styrene resin is preferred.
When the syrup color of the feed is high, the acrylic resin is selected. The current large-scale decolorization process. Part of the process combines two resin types to meet the requirements of feed pigment fluctuations, so as to obtain the ideal decoloring effect.
Pigments generally exist in the form of an organic acid, so in terms of exchange methods, decoloring resins are generally divided into two categories, namely ion exchange resins and macroporous adsorption resins. Ion exchange resin achieves the decolorization effect through ion exchange, and macroporous adsorption resin achieves the decolorization effect through specific surface area and mesh pore volume pore size adsorption. For example, the starch sugar is decolorized and decolorized with D301 macroporous weak alkali resin, and the end can also be refined and decolorized with SBA TA201D and remove impurities and odor. Can also choose macroporous strong base anion resin SBA TA213D (A-860) for decolorization.
Lanlang ion exchange resin for sugar decolorization have high work capacity and strength.If you need more information for ion exchange resin for sugar decolorization,welcome to conatct us.