What is a polishing mixed bed resin? Where can I find polished mixed bed resin?

Polishing mixed bed resin is a mixture of hydrogen-type strong acidic cation exchange resin and hydroxide-type strong alkaline anion exchange resin.

Polishing resins, as they are often referred to, are generally used at the end of ultrapure water treatment systems to ensure that the effluent quality of the system can maintain water standards. Generally, the effluent quality can reach more than 18 trillion ohms, and it has a certain control ability for TOC and SiO2. The ionic forms of the polishing resin are H and OH type, and they do not need to be regenerated after filling and use.

It is generally used in the semiconductor industry.

Generally used for: 1. Condensate polishing, industrial feed water treatment (softened water and high-purity water preparation), nuclear power plant water treatment;

2. Ultrapure water preparation, sweetener ash removal, decolorization and chromatographic separation, and other special separations and chemical reactions.

Mizusawa Environmental Technology Technician replied:

Mixed beds are shaded. Cation exchange resin is mixed in a certain proportion to fill the filter device, the anion in the water. Cation, when passing through the resin layer, the anion in the water is replaced by hydroxide ions, and the cation in the water is replaced by hydrogen ions, and the hydroxide ions and hydrogen ions in the water form water molecules, so as to achieve the effect of desalination.

The polishing mixed bed adopts high exchange capacity, full regeneration, and no chemical precipitation of nucleon-grade resin, which removes the residual trace charged ions and weak electrolytes in pure water, so that the water quality reaches 18 mcm or more.

Polishing resin directly to the water treatment equipment company, generally wholesale price!

The role of ultrapure water polishing mixed bed resin:The polishing mixed bed resin can remove other ions in the water except for hydroxide ions in the form of ion replacement, but the adsorption of ultrapure water resin also has a certain sequence, first by removing impurities and calcium and magnesium ions in the water through cations, and then by reducing the conductivity of anionic resin. It mainly acts on the boiler and semiconductor industry.

In particular, some people who have high requirements for water purity and need to meet ultrapure water standards must use ultrapure water resin. Ultrapure water resin can produce up to 18 trillion ohms, which meets the standard of ultra-high purity water.

The principle of polishing mixed bed resin:Place the cation and anion exchange resins on the same exchange bed and mix well before running. The mixed bed is a multi-stage compound bed composed of many cation and anion exchange resins.

In a mixed bed, the cation and cation resins are evenly mixed with each other, so the cation and anion exchange reactions are carried out almost simultaneously. In other words, the cation exchange and anion exchange of water are carried out by multiple exchanges. That is, H+ produced by H-type cation exchange and Oh1 produced by OH type ion exchange cannot accumulate, and water with a very low degree of dissociation will be formed immediately.

In this way, the influence of counterions is basically eliminated, and the ion exchange reaction can be carried out very thoroughly, so the effluent quality of the mixed bed is very high.

The delamination of polishing resin is generally caused by the following reasons:

1) Many users in order to remove the bubbles in the gap of the resin layer synchronously during the filling, so as to reduce the flushing time and reduce water consumption, and improve the utilization rate of resin exchange capacity, so in the initial filling in the polishing column water, sometimes due to the water injection is too high (generally 10cm can be required) to cause delamination, if non-professional and technical personnel filling, in fact, the step of water injection can be avoided, and the direct dry loading effect will be more stable;

2) In the process of polishing mixed bed use, due to the instability of production water, there is a phenomenon of stopping and stopping the equipment during operation, which is used for general polishing mixed bed resin equipment is to make water from the bottom slowly to the top after the water enters through the central pipe, and the resin layer is lifted when it is used, and the resin layer falls when it is stopped, so many times after causing the resin layer to loosen, and the delamination situation occurs. This type of equipment can be equipped with a check valve at the outlet or designed to circulate water;

3) Due to some small resin factories, in order to reduce production costs, the regeneration rate of polishing resin is not high, resulting in the resin itself is not tight enough, and it is easy to naturally stratify during operation.

Generally, there are many monomers inside Rohm and Haas polished mixed bed resins that are not used, as well as various additives and impurities, so they must be pretreated before formal use, so as to remove impurities in the water and prevent water from being polluted, the specific operation method is as follows:

1. Prevent Rohm and Haas from polishing mixed bed resin method.

1. Brine treatment.

First, the resin is packed into a container, soaked in a sodium chloride solution with more than twice the volume and 10% by mass for about 18 to 20 hours, and then the brine is drained until it does not appear yellow.

2. Dilute hydrochloric acid treatment.

With a mass fraction of hydrochloric acid that is more than twice the volume of Rohm and Haas polished mixed bed resin, the time is short, about two to four hours, and when the amount of these acids has been exhausted, the resin is rinsed until neutral.

3. Treatment of dilute sodium hydroxide solution.

Soak in sodium hydroxide solution for about three hours, about 2 times the volume of resin, and the mass fraction sodium hydroxide solution can be used. After all the lye is discharged, the resin is rinsed until the discharge core is close to neutral, and organic matter and silicon can be removed.

When preparing pure water, it is necessary to use new resin, usually using three acids and three alkalis treatment method, generally speaking, the resin volume is one to two times the mass fraction of four percent of the hydrochloric acid solution to soak it, about three hours, remember to be sure to rinse with pure water, flush to neutral, this process needs to be repeated three times.

2. Problems that should be paid attention to in the use of Rohm and Haas polishing mixed bed resins.

1. Let the resin maintain its own strength at any time. That is, it reduces the chemical and physical damage to the resin.

2. Let Rohm and Haas polish mixed bed resin maintain the original stability at any time. Reduce contact with organic impurities or metal ions such as iron ions to prevent contamination.

The polishing mixed bed, also known as the disposable mixed bed, is generally used at the end of the process to further improve the quality of the produced water. The resin of the polishing mixed bed cannot be recycled and reused. Polishing means the surface treatment of the resin.

The general design flow rate of the polishing mixed bed: 40-60m h

What material is used for the pipeline of the pure water system: PVC is used before the entrance of the polished mixed bed, and PVDF is used after the outlet. In addition, the polishing mixer is installed as close to the end of use as possible, because:

1.The polishing and mixing bed basically does not need maintenance management, and the installation on site and installation at the factory end will not have an impact on management. 2.

It has great benefits for improving water quality. 3.It can save PVDF costs to the greatest extent.

In order to obtain theoretical pure water with conductivity resistivity m ·cm in electronics, medicine or other industries, after the ordinary mixed bed or EDI water purification equipment, the polishing mixed bed is usually installed for final finishing. This kind of polishing mixed orange late bed resin is a mixture of anion resin and positive resin with a relatively close density, because the yin and yang resins of this resin can not be separated, and they cannot be regenerated separately by acid and alkali, so this polishing resin is discarded after failure.