The serial number of ion exchange resins, ion exchange resins can be divided into .

Such as 001x7

First of all, the first 0 represents that it is strongly acidic.

If it is 1, it means that it is weakly acidic.

2 is strongly alkaline.

3 is weakly alkaline.

4 is the bonding.

5 is of both sexes.

6 is oxidized cyclogenic.

The 0 of the second bit represents the styrene (structural body).

If it is 1, it means that it is acrylic.

2. Phenolic.

3 is epoxy.

4 vinylpyridine.

5 urea-formaldehyde.

6 vinyl chloride.

The last x7 represents a degree of cross-linking of 7%.

X number represents the degree of cross-linking.

If the previous d indicates that it is a large hole.

The sequence number may be the reason for the chronological order of the research.

The number you are talking about applies to conventional resins, such as 001x7, the number 7 represents the degree of crosslinking, and 201x7, 2 represents a strong base.

Summary. Hello, the following help is provided according to your problem, what are the types of ion exchange resins (1) Strong acid cationic resins.

This type of resin contains a large number of strongly acidic groups, such as sulfonic acid group SO3H, which is easy to dissociate H+ in solution, so it is strongly acidic. After the resin is dissociated, the negative charged groups contained in the body, such as SO3-, can adsorb other cations in the binding solution. These two reactions cause the H+ in the resin to be exchanged with the cations in the solution.

Strong acidic resins have a strong dissociation ability, and can dissociate and produce ion exchange in both acidic or alkaline solutions.

After the resin is used for a period of time, it is regenerated, that is, the ion exchange reaction is carried out in the opposite direction with chemicals, so that the functional groups of the resin are restored to their original state for reuse. As mentioned above, cationic resin is regenerated with strong acid, and the resin releases adsorbed cations, which are then combined with H+ to restore their original composition.

2) Weakly acidic cationic resin.

These resins contain weakly acidic groups, such as carboxyl-COOH, which can dissociate H+ in water and become acidic. The remaining negative groups after the dissociation of the resin, such as r-coo- (r is a hydrocarbon group), can be adsorbed with other cations in the solution.

002 3 indicates which ion exchange resin.

Hello, according to your problem, we provide the following help, what are the types of ion exchange resins: (1) Strong repentance residue acid cationic resin This kind of resin contains a large number of strong acidic groups, such as sulfonic acid group SO3H, which is easy to dissociate H+ in solution, so it is strongly acidic. After the resin is dissociated, the negative charged groups contained in the body, such as SO3-, can adsorb other cations in the binding solution. These two reactions cause the H+ in the resin to be exchanged with the cations in the solution.

Strong acidic resins have a strong dissociation ability, and can dissociate and produce ion exchange in both acidic or alkaline solutions. After the resin is used for a period of time, it is necessary to carry out regeneration treatment, that is, the ion exchange reaction is carried out in the opposite direction with chemicals, so that the functional groups of the resin can be restored to their original state, so as to imitate it for reuse. As mentioned above, cationic resin is regenerated with strong acid, and the resin releases adsorbed cations, which are then combined with H+ to restore their original composition.

2) Weakly acidic cationic resins: These resins contain weakly acidic groups, such as carboxyl-Cooh, which can dissociate H+ in water and are acidic. The remaining negative groups after the dissociation of the resin, such as r-coo- (r is a hydrocarbon group), can be adsorbed with other cations in the solution.

It is a weakly acidic cationic resin.

Ion exchange resins can be divided into ().

a.Hydrogen and sodium.

b.Chlorine and hydroxide.

c.Salt and non-salt.

d.Cationic and anionic.

Correct answer: D

How to use ion exchange resin and how to do it:

1. Pre-selection. The particle size of ion exchange resin is generally controlled at 20-35 mesh, which should be dried, crushed and sieved before use; Do not divide too finely when grinding, otherwise the experimental yield will be affected.

2. Pretreatment. Strong alkaline ion exchange resin should be treated with 20 times the volume of resin with 4% sodium hydroxide aqueous solution, then washed with 10 times the volume of water, then treated with 10 times the amount of 4% hydrochloric acid, and finally washed with distilled water to neutral, then converted the chlorine type to OH type, then converted to chlorine type, and finally treated with 10 times the 4% sodium hydroxide aqueous solution. When the weakly alkaline ion exchange resin is treated, it only needs to be washed with 10 times the amount of distilled water, and it does not need to be washed to neutral.

3. Loading columns. Put the treated resin into the beaker, add water and stir fully to remove the bubbles, let it stand for a few minutes until most of the resin settles, and then pour off the upper layer of muddy particles; Repeat the operation until the upper liquid is clear, and then the column can be loaded. Be careful to put a glass filament of 1cm at the bottom of the column, flatten it with a glass rod, pour resin into the column, and also take care to prevent bubbles.

4. Resin exchange. The sample is prepared into an aqueous solution of a certain concentration and passed through the column at the appropriate flow rate, or the sample solution can be passed through the column repeatedly until the component exchange is complete. Use chromogenic methods to check whether the components are exchanged thoroughly.

5. Resin elution. Note that the components with weak affinity are washed off first, and the commonly used ion exchange resin eluents include strong acids, strong bases, salts, different pH buffer solutions, organic solutions, etc., and gradient elution or single concentration elution can be selected.

6. Resin regeneration.

Ion exchange resin exchange capacity:

The performance of ion exchange resins in ion exchange reactions is reflected in its "ion exchange capacity", i.e., milligram equivalents of ions that can be exchanged per gram of dry resin or per milliliter of wet resin, meq g (dry) or meq ml (wet); When the ion is monovalent, the milligram equivalent number is the milligram number of molecules (for divalent or polyvalent ions, the former is the number of the latter multiplied by the ionic valence). It is also expressed in three ways: "total switching capacity", "working switching capacity", and "regenerating switching capacity".

1. Total exchange capacity, which represents the total amount of chemical groups that can carry out ion exchange reactions per unit quantity (weight or volume) of resin.

2. The working exchange capacity indicates the ion exchange capacity of the resin under certain conditions, which is related to the type and total exchange capacity of the resin, as well as the specific working conditions such as the composition, flow rate, temperature and other factors of the solution.

3. The regeneration exchange capacity indicates the exchange capacity of the regenerated resin obtained under a certain amount of regeneration, indicating the degree of regeneration and recovery of the original chemical groups in the resin.

In general, the regenerative exchange capacity is 50 90% of the total exchange capacity (70 80% is generally controlled), while the working exchange capacity is 30 90% of the recycled exchange capacity (for recycled resins), the latter ratio is also known as the utilization rate of resin.

In practice, the exchange capacity of ion exchange resins includes adsorption capacity, but the proportion of the latter fiber bond varies depending on the resin structure. At present, it is not possible to calculate separately, and in the specific design, it needs to be corrected based on empirical data and reviewed in actual operation.

The determination of the exchange capacity of ionic resins is generally performed with inorganic ions. These ions are small in size and can diffuse freely into the resin, reacting with all the exchange groups within it. In practical applications, the solution often contains polymer organic compounds, which are large in size and difficult to enter the micropores of the resin, so the actual exchange capacity will be lower than the value measured with inorganic ions.

This depends on the type of resin, the size of the pore structure, and the substance being processed. The performance of ion exchange resins in ion exchange reactions is reflected in its "ion exchange capacity", i.e., milligram equivalents of ions that can be exchanged per gram of dry resin or per milliliter of wet resin, meq g (dry) or meq ml (wet); When the ion is monovalent, the milligram equivalent number is the milligram number of molecules (for divalent or polyvalent ions, the former is the latter multiplied by the ionic valence). It is also expressed in three ways: "total switching capacity", "working switching capacity", and "regenerating switching capacity".

In order to remove ionic impurities from water or solution, the most widely used method is ion exchange. Ion exchange refers to the phenomenon that an ion exchanger exchanges itself with ions of the same symbol charge in water.

For example, when ion exchange resin is used for water treatment, the ion exchange resin can exchange some ions of its own with ions of the same symbol charge in the water to achieve the purpose of purifying water (R stands for ion exchange resin in the following reaction formula).

For example, when the H-type cation exchange resin encounters water containing Ca2+ and Na+, the following reaction occurs:

2rh + ca2+ →r2ca + 2h+

rh + na+ →rna + h+

When the OH anion exchange resin encounters water containing Cl- and SO42-, its reaction is as follows:

roh + cl- →rcl + oh-

2roh + so42- →r2so4 +2oh-

The result of the reaction is that the impurity ions in the water (Ca2+, Na+, Cl-, SO42-, etc.) are adsorbed on the resin respectively, and the resin changes from H type and OH type to Ca type, Na type and Cl type SO4 type, and the H+ and Oh- on the resin enter the water and combine with each other to form water, so as to remove the impurity ions in the water and prepare pure water.

h+ +oh- →h2o

The reason why the ions of the ion exchange resin can be exchanged with the ions in the water is that the ion exchange resin has exchangeable active ions. And because the ion exchange resin is porous, that is, there are many tiny meshes in the resin particles that can penetrate into it, so that the resin and water have a large contact surface, not only can be exchanged on the outer surface of the resin particles, but also in the mesh in contact with water.

Of course, ion exchange is not only used in conventional water treatment, but also widely used in light industry, electronics, food fermentation, biopharmaceutical, hydrometallurgy and many other fields of separation and purification process, its basic principle of action is through the mutual exchange reaction of ions with the symbol charge to achieve separation and purification.

The cation exchange resin of sodium type and hydrogen type is different, and the difference in the use of different ionic forms of resin is completely different. For example, sodium-type cation resin is mainly suitable for the softening of hard Lao's water to remove calcium and magnesium ions; The hydrogen-based cation resin is mainly suitable for the preparation of pure water and ultrapure water, Labi, etc.

In general, sodium-based resins are more often used in industrial fields, while hydrogen-based resins are more often used for softening hard water.

The ions contained in the resin are different, the sodium resin contains a large number of sodium ions in the body, and the hydrogen resin contains a large number of hydrogen ions in the body, which is also the origin of the name of the sodium resin and the hydrogen wheel containing resin.