Indicator specific resin color changing resin

Indicator specific resin color changing resin

Color changing grease can be used to monitor the outflow of water from the anode or cathode bed, indicating the failure point in a timely manner when the anode or cathode bed is about to fail. It is an intuitive and effective supplement to online monitoring instruments. It has the advantages of stability, reliability, ease of use, and non polluting water quality.

Color changing cation exchange resin is a type of cation exchange resin with an indicator. The factory type is hydrogen type. When the water of the color changing cation resin contains various cations such as Na+, K+, Ca2+, Mg2+, Fe2+, etc., it exchanges with the H+carried by the resin, and the resin layer begins to fail. The color of the failed layer changes significantly, indicating the leakage of cations in the water. H+type is dark green, Na+type is rose red, and the color difference of the product is very obvious. It also has good exchange capacity and physical stability.

Color changing cationic resin is generally used in front of H+conductivity meters such as condensate water, deaerator, economizer, and main steam in thermal power plants to remove free ammonia introduced into the water and convert all cations into H+ions, avoiding the phenomenon of Ca2+, Mg2+, and Na+leaking into the condensate water and causing a decrease in the displayed value of the conductivity meter.

The color changing cation resin is used in combination with an H+conductivity meter to monitor whether the leakage of the condenser exceeds the standard, determine whether the condensed water needs to be treated, and monitor whether the quality of the feedwater and steam meets the standard requirements. It is an important and relied upon chemical meter for chemical supervision in thermal power plants.

Application scope of color changing resin: Monitoring and controlling the hydrogen conductivity of feedwater, condensate, and steam is an important means to ensure the quality of water vapor and control corrosion and scaling in the water vapor system of thermal power plants.

Due to the frequent changes in ammonia concentration and sampling flow rate in water vapor, as well as factors such as unit start-up and shutdown, it is difficult to determine when the H-type exchange column will fail. In the initial stage of H-type exchange column failure, due to the penetration of a small amount of ammonium ions, the measured hydrogen conductivity value is low; When the H-type exchange column * fails, a large amount of ammonium ions pass through, and the hydrogen conductivity measurement value is also higher. Therefore, when the failure of the exchange column causes a change in hydrogen conductivity, it is difficult to timely determine whether it is due to water quality deterioration or exchange column failure. The current solution adopted abroad is to use color changing cation exchange resin. The color of the failed layer is different from that of the non failed layer. It can be regenerated in a timely manner before the H-type exchange column fails, which can detect water quality deterioration problems in a timely manner and take timely measures to solve them.

Usage of color changing resin:

The newly purchased color changing resin is an untreated Na type resin that must be treated in the following ways before it can be used:

(1) Put the new resin into a container and clean it 2-3 times with desalinated water until the water is clear; If the resin becomes dry, it needs to be soaked in a 10% NaCl solution for 2 hours before cleaning to prevent the resin from bursting due to rapid expansion.

(2) Load the cleaned resin into the actual exchange column, and use a 5% HCl regeneration solution with a volume not less than 10 times that of the resin for dynamic counter current regeneration (opposite to the flow direction of the exchange column). Control the regeneration flow rate at 3m/h to 5m/h to ensure that the contact time between the regeneration solution and the resin is not less than 30 minutes;

(3) After the regeneration solution is completed, rinse the exchange column with desalinated water at a high flow rate in the direction of the flow of the exchange column (flushing flow rate of 10m/h to 20m/h), and the flushing time should not be less than 12 hours

(4) The regenerated and cleaned hydrogen exchange column can be installed into the actual system for measuring hydrogen conductivity.

(5) The failed color changing resin hydrogen exchange column can be directly regenerated using the same steps as (2) to (4).

Storage of color changing resins: Resins that require long-term storage should be regenerated into hydrogen type resins before storage.

Indicator specific resin color changing resin
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Introduction to Resin Fundamentals and Regeneration Methods/

　　Introduction to ion exchange resin basics

The full name of ion exchange resin consists of classification name, skeleton (or gene) name, and basic name. Resins are divided into two types: gel type and macroporous type. Those with physical pore structure are called macroporous resins, and "macroporous" is added before the full name. For those classified as acidic, "ldquota ^ fen ^ yang" rdquota ^ fen ^ should be added before the name. For those classified as alkaline, "ldquota ^ fen ^ yin" rdquota ^ fen ^ should be added before the name. For example, macroporous strongly acidic styrene based cation exchange resin.

ion exchange resin

Ion exchange resins can also be classified into styrene based resins and acrylic based resins based on the type of their matrix. The types of chemically active groups in resins determine their main properties and categories. Firstly, it can be divided into two categories: cationic resin and anionic resin, which can respectively exchange ions with cations and anions in solution. Cationic resins are divided into strong acidic and weak acidic categories, while anionic resins are divided into strong alkaline and weak alkaline categories (or further divided into medium strong acid and medium strong alkaline categories).

ion exchange resin

Ion exchange resin cannot be stored outdoors. The temperature of the storage area is 0-40 ℃. When the temperature of the storage area is slightly lower than 0 ℃, clear saturated saline solution should be added to the packaging bag to soak the resin. In addition, when the storage temperature is too high, it not only makes the resin easy to dehydrate, but also accelerates the degradation of the anion resin. Once the resin loses water, it cannot be directly soaked in water during use. It can be soaked in clear saturated saline solution, and then gradually diluted with water to wash away the salt. During storage, it should be kept moist.

ion exchange resin

　　Regeneration method of ion exchange resin

When the adsorption capacity of the resin decreases or is heavily contaminated after a certain period of use, it is necessary to strengthen regeneration. The method is to add a 3% -5% hydrochloric acid solution that is 10CM higher than the resin layer to the container and soak it for 2-4 hours, then rinse the column. Continue to pass 3-4 times the volume of resin and the same concentration of hydrochloric acid solution through the column, then rinse with clean water until it is close to neutral ^ fen ^, and soak in 3% -5% * solution for 4 hours. Rinse the column with 3-4 times the volume of resin solution of the same concentration, then rinse with clean water until the pH value is neutral, and set aside for later use.

Grade resin is regenerated with NaOH solution, and the pH value is adjusted by acidification.