How do you calculate resin ion exchange volume?
If you divide the capacity value by the challenge hardness, you get the number of gallons representing the throughput capacity (operating capacity). Example: 24,000 grains capacity per cubic foot challenged with 20 grains per gallon feed: (24,000/20 =) 1,200 gallons.
What is cation exchange resin give example?
The most commonly available cation exchange resin is sodium polystyrene sulfonate (Kayexalate). In the gut, sodium polystyrene sulfonate absorbs potassium and releases sodium. Each gram of resin may bind as much as 1 mEq of potassium and release 1 to 2 mEq of sodium.
What is the action of cation exchange resin?
In a cation-exchange resin all the sites are negatively charged, so that only positive ions can be separated; an anion-exchange resin has positively charged sites. Ion-exchange chromatography has become one of the most important methods for separating proteins and small oligonucleotides.
How is ion exchange calculated?
The IEC is defined as the milliequivalent of ion-exchange groups included in a 1-g dry membrane (meq (g dry membrane)− 1). The concentration of ion-exchange groups is obtained by dividing the IEC with the water content in a 1-g dry membrane (meq (g H2O)− 1).
What is cation exchange capacity of resin?
One important characteristic of ion exchange resin is its capacity, expressed in terms of milliequivalents of exchangeable ion per gram of resin. Exchange capacity can be measured by exchanging sodium ion (Na+) for. hydrogen form (H+ initially attached to the resin).
What do you mean by ion exchange capacity of a cation exchange resin?
ion-exchange capacity, measure of the ability of an insoluble material to undergo displacement of ions previously attached and loosely incorporated into its structure by oppositely charged ions present in the surrounding solution.
What is cation anion exchange resin?
A cation resin is one that exchanges positive ions. An anion is an ion with a negative charge. Common anions include Cl-1, SO4-2, and OH-1 . An anion resin is one that exchanges negative ions.
What is cation anion exchange?
Ion exchangers are either cation exchangers, which exchange positively charged ions (cations), or anion exchangers, which exchange negatively charged ions (anions). There are also amphoteric exchangers that are able to exchange both cations and anions simultaneously.
What is total exchange capacity of resin?
The total capacity of a resin sample is the number of ion exchange sites. See details at the end of the page. Typical capacity values are given below. In other words, the total capacity is the maximum theoretical quantity of ions that the resin can load.
How do you calculate resin capacity?
How do you calculate resin capacity?
- Convert water hardness from ppm to grains per US gallon. Total Hardness (ppm) = Total Hardness (gpg) Example: 118 ppm TH = 6.9 gpg;
- Calculate softener capacity in grains.
- Calculate softener capacity in gallons.
- Table One: Tank Size and Resin Volume.
How is resin capacity measured?
The total capacity of a resin sample is measured by titration and expressed in eq/L.
What is a cation-exchange resin?
A cation-exchange resin is a cross-linked polymer with negatively charged structural units. The resin can exchange bound Na + (Kayexalate) or Ca 2+ (calcium resonium) for cations including K +. The purpose of using resins is to enhance the elimination of K + from the gastrointestinal tract. The cation-exchange resin Kayexalate contains 4 mEq
What is the pH of a cation exchange resin?
For example, if a cation exchange resin is used at a pH of 7.5, in general, all proteins that have a pI >7.5 will carry a net positive charge and will bind the negatively charged resin.
What is the difference between cation exchanger and anion exchanger?
Cation Exchanger vs. Anion Exchanger The net charge of the molecule (s) of interest determines resin choice. If positively charged molecules are to be immobilized by the column resin, a cation exchange resin is chosen, whereas a positively charged anion exchange resin is chosen if negatively charged molecules are to be captured by the resin.
How do you choose a negatively charged cation exchange resin?
A negatively charged cation exchange resin is thus chosen when the protein of interest carries a net positive charge at the working pH.