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1. Continuous Ion Exchange Technology
Continuous ion exchange is a new separation technology. It is based on theexisting adsorption, ion exchange and chromatographic separation technology, but different from the fixed bed, pulse bed, simulated moving bed and other separation systems in the traditional sense. It can simultaneously  concentrate each working procedure of traditional ion exchange and chromatographic separation in a system, while at the same time carrying out multi-stage separation steps. It can be used for separation,refining,purification and recycling of effective components from industrial feed liquid or impurities removal.

 

The continuous ion exchange system can use conventional adsorbents, such as ion exchange resins, activated carbon and synthetic adsorbents. Since the continuous ion exchange system runs continuously and need not to set up an alternate device, the ion exchange resin does not need to interrupt normal production during regeneration. Since multi-column adsorption and run continuously at a steady state, it can handle materials with higher concentrations of impurities to ensure the product has a stable composition and concentration. Meanwhile, the system has multiple channels and can change the flow direction of the fluid according to process requirements. Because it enables to operate multi-stage separation procedures at the same time, the more complex the separation process is, the better it can exert its advantages.

 

 


2. Advantages of The Continuous Ion Exchange System
1)
Reduce 50-90% of separation media;
2)Handle materials of higher concentrations, and due to the continuous operation, the product composition and concentration are stable after absorption or ion-exchange.
3)Reduce about 30-65% of chemicals and eluents; reduce 30-85% of wastewater emissions;
4)The system is compact; the original fixed-bed processes are all focused on this system to avoid investment duplication of equipment and reduce50-80% of floor space;
5)The system is easy to match other devices, under full automatic control, and is easy to operate and control.

 

        
3. Applications of The Continuous Ion Exchange System
=Biochemical and pharmaceutical industries
--antibiotics, vitamins, amino acid separation, purification, concentration and traditional Chinese medicine fields.
=Food industry—syrup desalination, Preparation of lactic acid, citric acid, tartaric acid, and glucolactone, separation and purification of juices and beverage.
=Fine chemical engineering and biotechnology--separation of chiral substances.
=Metallurgy, electroplating, chemical industries--rare, precious metals recovery, heavy metal removal; industrial wastewater treatment, decolorization, demineralization; pure water preparation; potash production; rare earth separation


4. Process Examples of The Continuous Ion Exchange System
As shown in the figure, 3~9# is the adsorption zone. The feed liquid enters the system in parallel at 3,4#. Taking advantages of different resin adsorption capacities of various components, when stationary phase (resin) is constantly moving, the product and other components have been separated and purified. 1~2# is the adsorption washing zone. At 1#, use deionized water to wash resin with saturated adsorption, so as to retain the product and other non-adsorbed substances in the resin gap and thus ensure the purity of the product resolution. Since the washing liquid still contains products, it enter into the secondary adsorption zone after minxing 3,4 # effluent in order to ensure the product yield. 20# is the ER (excluding entrainment) zone. The resolution products will render the water out of the resin gap, to ensure the product concentration during resolution. 14~19# is resolution zone,products are collected at 18 and 19# . 12~13# is the resolution water zone, in which the effluent also contains a large amount of untapped resolution solvent and washing products. In order to improve solvent efficiency and product yield, the effluent is mixed with 14 and 15# effluent and enter into the secondary resolution zone. 10~12# is regeneration zone. The regeneration agent is decided by the resin model  and acid-alkali regeneration is mainly used in this process.

 

Because each column can be fully utilized, it ensures each column that enters the next zone can achieve the  optimal state and completely separate the product from impurities. The product quality is improved; when resolving the product is fully resolved and the resolution product concentration can be guaranteed via the ER (excluding entrainment) zone, which is conductive to concentration of subsequent processes.