In a De-mineralization (DM) plant, a degasser, also known as a degasifier, is crucial for removing dissolved carbon dioxide (CO2) and stabilizing pH

 In a De-mineralization (DM) plant, a degasser, also known as a degasifier, is crucial for removing dissolved carbon dioxide (CO2) and stabilizing pH. It achieves this by forcing air through the water, which allows the CO2 to escape. This process helps to prevent the formation of carbonic acid (H2CO3) and subsequent acidification of the water. 

DM PLANT - Industrial Chemical Testing

Here's a more detailed look:

1. CO2 Removal:

The degasser utilizes a tower where water flows down, and air is blown up from the bottom. 

This action creates a gas/liquid interface, allowing CO2 to dissolve in the water and then escape into the air. 

The released CO2 is vented, reducing the CO2 content in the water. 

2. pH Stabilization:

CO2 dissolved in water forms carbonic acid (H2CO3). 

This acid can lower the pH of the water, potentially impacting the efficiency of ion exchange resins. 

By removing CO2, the degasser helps maintain a more stable and neutral pH, typically around 6.5 to 7.5, which is ideal for demineralization processes. 

3. Benefits of Degassing:

Reduced load on anion exchangers:

Less CO2 means less acidic water, reducing the load on anion exchange resins, which are responsible for removing anions (negatively charged ions) like bicarbonates and chlorides.

Improved resin efficiency:

By minimizing the effects of CO2, the degasser helps ion exchange resins operate at peak efficiency and extend their lifespan.

Prevented resin fouling:

The absence of CO2-related impurities can reduce the risk of resin fouling, which can significantly impact resin performance and require frequent regeneration.

Minimized corrosion:

Removing carbonic acid helps prevent corrosion of plant components.