Pure water resin mixed bed cation resin

Pure water resin mixed bed cation resin

Storage and usage instructions for mixed bed polishing resin

1. Precautions before use: 1.1 After opening, resin exposed to air for a long time will absorb carbon dioxide, which will affect the performance and use of the product. Therefore, once unpacked, it should be used as soon as possible. The unused parts must be carefully sealed and stored in a dark and cool place, with an appropriate ambient temperature of 5-30 ℃.
During transportation, storage, and loading, any contact with inorganic or organic substances can contaminate the resin, thereby reducing the quality of the effluent; Affects operating conditions. Therefore, it is necessary to ensure that all equipment and water used for loading and operation do not contaminate the resin. All water in contact with resin must be pure water, and all equipment or appliances in contact with resin must be cleaned with pure water before use. The pure water standard is equivalent to or lower than the RO membrane effluent )
1.3 If replacing resin, the old resin in the equipment must be removed from the resin container, and the interior of the resin container must be clean and free of impurities.

2. Loading program:
2.1 Resin filling amount: About 70% of the effective volume of the resin tank, and the height of the resin layer should be greater than or equal to 700mm.
2.2 After filling the resin tank with resin, slowly add water until the water level is at least 300mm higher than the resin high-speed, and let it soak for more than 10 hours to facilitate the release of air from the resin layer. However, if the equipment size is small and resin is intended to be filled by mixing it with slurry and water, it is also acceptable.
2.3 Load the resin into the resin tank. The resin can be directly added from the original packaging bag or some water can be added to the original packaging container to form a slurry and loaded into the resin container.
Pay attention to the following during the loading process:
2.3.1 It is prohibited to use any mechanical pump to transfer resin, as many types of pumps can cause damage or pollution to the resin.
During the resin filling process, do not open more than two bags of resin at the same time. To reduce the time the resin comes into contact with air and also decrease the possibility of foreign impurities contaminating the resin.
During the filling process, as the filling position increases, the water above the resin layer will gradually increase. If the water level is higher than the resin layer by more than 50mm, the excess water must be extracted or drained to avoid slow settling of the resin in the water and delamination. But at the same time, it is also necessary to avoid the situation of liquid level draining, which can cause air to form air plugs in the resin layer and affect the outflow of water.
After the resin is filled in place, inject pure water to fill the tank. Cover the package and connect the pipeline in place.
After the resin filling is completed, it should be soaked in water for less than 4 hours. If possible, soak overnight.
2.5. After checking that all components and pipeline connections are correct, the valve can be opened to collect water. The newly filled resin undergoes a flushing process during its initial operation, during which the electrical resistivity of the effluent gradually increases. Depending on the on-site situation, the flushing time may last from tens of minutes to several hours.

3. Operating parameters for water production:
3.1 Inlet water quality requirements: The conductivity of the RO membrane effluent should be less than 10US/cm and should not exceed 20 US/cm.
3.2 Water production flow rate: 10BV-20BV (10 to 20 times the resin volume per hour).
After starting up and running, the flushing time is about several tens of minutes to several hours, and the resistivity gradually increases.
After 2-3 shutdowns and startups, the resin achieves optimal water output.

4. Shutdown and startup steps:
4.1 Close the inlet valve
4.2 Close the water outlet valve to prevent water loss in the resin tank, ensuring that the resin does not lose water inside.
4.3 When reusing, slowly open the water outlet valve first.
4.4 Open the inlet valve, with the valve opening roughly the same as the outlet valve,
After normal outflow operation, gradually open the outflow valve and inlet valve to achieve normal outflow flow rate.

5 Precautions:
5.1 From cleaning the resin tank to filling the resin and using water for operation, this system should use RO membrane effluent with a conductivity of less than 10us/cm. The lower the better, which can improve the effluent quality and increase the water production capacity Do not use water with poor water quality, otherwise it may result in substandard effluent quality, reduced water production capacity, or even ineffective resin transmission Losing the ability to produce water.
5.2 The upper layer of resin should maintain a certain water level, with the principle of not causing resin surging when water enters Maintain the static state of the resin layer.
5.3 During use, it is important to avoid water shortage in the resin layer, which may cause the resin layer to enter the air.
During use, it is prohibited to introduce air or water from the bottom of the resin layer, which may cause resin delamination and affect the water production efficiency and cycle. In severe cases, it loses its ability to produce water.

Pure water resin mixed bed cation resin
The products produced by the company include six major series of dozens of fine chemicals, including ion exchange resins, circulating water treatment agents, boiler auxiliaries, reverse osmosis membrane agents, atmospheric pollution control agents, and sewage treatment agents. They are widely used in the fields of steel industry, petrochemical industry, thermal power industry, papermaking industry, microelectronics industry, pharmaceutical industry, printing and dyeing industry, and three waste treatment
Influence and factors of resin layering on effluent/

　　Poor layering of mixed bed resin can lead to "cross contamination", which has two impacts on the effluent quality of mixed beds:

1. Poor stratification is the main reason for the low pH value of mixed bed effluent. Due to poor resin layering, the resin may be contaminated by regenerated acid. Namely: ROH+HCl&dash ^ fen ^ RCl+H20. When the mixed bed is being washed or operated, due to the continuous increase in pH value in the water (up to 4-7), acid contaminated resin will undergo hydrolysis within this pH range: RCl+H2O&dash ^ fen ^ ROH+HCl. Due to the influence of hydrolysis product HCl, there may be situations where the washing time of the mixed bed is too long or the pH value of the effluent is too low.

Mixed bed resin

2. Poor stratification is the main reason for the high salt content in the effluent of mixed beds. Due to poor layering, the cation resin may be contaminated by regenerated alkali. Namely: RH+NaOH&dash ^ fen ^ RNa+H20. In this way, during the washing or operation of the mixed bed, Na+on the cation exchange resin will gradually be displaced and enter the water. On the one hand, this will prolong the washing time of the bed, and on the other hand, it will also increase the salt content in the effluent of the mixed bed during operation.

Mixed bed resin

　　The layering effect of mixed bed resin and the following factors

1. The wet true density of resin is poor. Production practice has shown that in order to ensure good layering effect of mixed bed resin, the wet true density difference between the cation and anion resins should be above 15% to 20%. If the wet true density difference of the resin is less than the above value, the layering effect of the cation and anion resins is not good.

2. Particle size of resin. Uneven resin particle size can also affect delamination. In order to ensure the layering effect, the particle size of the cation and anion resins should be uniform, generally requiring a particle size of 0.3-0.5mm and a sieve size of over 90% (i.e. 90% of the resin particle size variation range is within ± ^ fen ^ 100 dou m).

3. The degree of resin failure. After absorbing different ions, the resin has different densities and sedimentation rates. For cation resins, the density arrangement of different ion types is as follows: pH. When the mixed bed runs to the end point, if there are more resins in the bottom layer that have not yet failed, it can be seen from the above arrangement that the density difference between the non failed cation tree fingers (H-type) and the failed anion resin (S04 type) is small, making stratification more difficult. At this point, it is often necessary to backwash several times before the layers can be completely layered.

Mixed bed resin

4. The phenomenon of 'ldquo ^ fen ^ clustering' rdquo ^ fen ^. H-type and OH type resins have a phenomenon of mutual adhesion (commonly known as "ldqu ^ fen ^ clustering" rdqu ^ fen ^), making delamination difficult. In practical production, in order to overcome the difficulties of ③ and ④, some alkali can be added to the bed before stratification to regenerate the anion resin into OH type and convert the cation resin into Na type, thereby increasing the density difference between the two resins and accelerating their stratification.

5. Improper backwashing operation, too low backwashing flow rate or too short backwashing time.

Among many building materials, there are many that we are familiar with but use professional names to express them, so we may be unfamiliar with them.