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Introduction to the Exchange Capacity of D301 Macroporous Weak Basic Anion Exchange Resin
2020/11/6
The performance of D301 macroporous weakly basic anion exchange resin for ion exchange reactions is its"ion exchange capacity",which is the milligram equivalent of exchangeable ions per gram of dry resin or per milliliter of wet resin,meq/g(dry)or meq/ml(wet);When an ion is monovalent,the milligram equivalent is the number of milligrams of molecules(for divalent or multivalent ions,the former is the number multiplied by the ion valence).There are three other display methods:"total exchange capacity","working exchange capacity",and"exchange capacity".
1)The total exchange capacity represents the total amount of chemical groups involved in ion exchange reactions for each single digit(weight or volume)of resin.
2)The action exchange capacity represents the ion exchange capacity of a resin under certain conditions,which is related to the type and total exchange capacity of the resin,as well as specific action conditions such as solution composition,flow rate,and temperature.
3)The exchange capacity represents the exchange capacity of the resin under linear conditions,and represents the degree of recovery of existing chemical groups in the resin.
In practical use,the exchange capacity of D301 macroporous weakly basic anion exchange resin includes adsorption capacity,and the proportion of the latter varies depending on the resin structure.At present,individual calculations cannot be carried out.In the specific design,adjustments should be made based on empirical data and comments should be made during actual implementation.
The measurement of exchange capacity of D301 macroporous weakly basic anion exchange resin is generally carried out under inorganic ions.These ions are very small in size and can freely diffuse into the resin and react with their internal full exchange groups.In practical use,the solution contains a large amount of excellent polymer substances,which are large in size and difficult to enter the micropores of the resin.Therefore,the actual exchange capacity is lower than the value measured by inorganic ions.This is related to the type of resin,the size of the pore structure,and the substance to be treated.
1)The total exchange capacity represents the total amount of chemical groups involved in ion exchange reactions for each single digit(weight or volume)of resin.
2)The action exchange capacity represents the ion exchange capacity of a resin under certain conditions,which is related to the type and total exchange capacity of the resin,as well as specific action conditions such as solution composition,flow rate,and temperature.
3)The exchange capacity represents the exchange capacity of the resin under linear conditions,and represents the degree of recovery of existing chemical groups in the resin.
In practical use,the exchange capacity of D301 macroporous weakly basic anion exchange resin includes adsorption capacity,and the proportion of the latter varies depending on the resin structure.At present,individual calculations cannot be carried out.In the specific design,adjustments should be made based on empirical data and comments should be made during actual implementation.
The measurement of exchange capacity of D301 macroporous weakly basic anion exchange resin is generally carried out under inorganic ions.These ions are very small in size and can freely diffuse into the resin and react with their internal full exchange groups.In practical use,the solution contains a large amount of excellent polymer substances,which are large in size and difficult to enter the micropores of the resin.Therefore,the actual exchange capacity is lower than the value measured by inorganic ions.This is related to the type of resin,the size of the pore structure,and the substance to be treated.
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