What are Ion exchange resins?
Ion exchange is a reversible chemical reaction that removes dissolved ions from solution and replaces them with other ions with the same or similar electrical charge.
IX resin is a physical medium that enables ion exchange reactions rather than being a chemical reactive in and of itself. The resin is made up of organic polymers that create a hydrocarbon network. Ion exchange sites are found throughout the polymer matrix, where "functional groups" of positively charged ions (cations) or negatively charged ions (anions) are glued to the polymer network. These functional groups are very good at attracting ions with opposite charges.
What is the ion exchanger capacity of Ion exchange resins?
In a process known as polymerization, hydrocarbon chains are cross-linked to generate the ion exchange resin matrix. The cross-linking provides the resin polymer with a stronger, more resilient structure as well as increased capacity (by volume).
While the majority of ion exchange resins are made of polystyrene, others are made of acrylic (either acrylonitrile or methyl acrylate). The resin polymer is then subjected to one or more chemical treatments in order to bind functional groups to the matrix's ion exchange sites. The ion exchange resin's separation capabilities are determined by these functional groups, which vary greatly from one type of resin to the next.
Capacity of ion-exchange resins
Ion-exchange capacity (IEC) refers to the total number of active sites or functional groups in a polymer electrolyte membrane that are responsible for ion exchange. In most cases, inorganic ions are used to determine ion resin exchange capacity. Because these ions are tiny, they may freely diffuse into the resin body and react with all of the exchange groups inside it.
The real exchange capacity will be lower than the value tested with inorganic ions in practical applications because the solution typically contains high molecular weight organic compounds that are large in size and difficult to enter the micropores of the resin. The type of resin, the size of the pore structure, and the substance being treated all have a role in this circumstance.
The "ion excha?nge capacity" of an ion exchange resin, is defined as the number of milligrams equivalents of ions that may be exchanged per gram of dry resin or per milliliter of wet resin, and is measured in meq/g (dry) or meq/ml (wet).Ion exchange resins' exchange capacity includes adsorption capacity in practice;However the proportion of the latter varies depending on the resin structure.
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