*4.3.1.1 Neutralizing amines*

Cyclohexyl amine (C6H13N), monoisopropanol amine [NH2CH2CH(CH3)OH], morpholine (C4H9NO), and ammonium hydroxide (NH3·H2O) are usually used for neutralization reaction in boiler systems. They are also dosage by dose for condensate lines. The amine is complemented to the supplemental water and then mixed with the water vapor produced from the boiler. When the water vapor cools down in the condensate line, the amine will dissolve in condensation product and neutralize CO2 (H2CO3). Therefore, the pH value of the solution in the condensate line will be raised, and the crisis of metal corrosion will be eased. **Table 15** displays the needed


#### **Table 14.** *Some species of O2 scavengers.*


**Table 15.**

*The species and amounts of amines for neutralizing CO2.*

concentrations of amines for the neutralization reaction when the concentration of CO2 is 1 mg/L. NH3·H2O is efficient for the neutralization reaction for CO2 revealed in **Table 15**; however, it is not appropriate for the copper condensate lines in boilers because it may accelerate copper corrosion.
