Which two volatile amines are commonly used in boiler systems?

Cyclohexylamine and morpholine are commonly used in boiler systems as volatile amines due to their ability to control pH and minimize corrosion within the steam and water system. These amines can easily evaporate and travel with steam, allowing them to address issues throughout the boiler system, including in condensate return lines.

These amines are effective because they neutralize any acidic substances present, thus raising the pH of the water and reducing corrosion rates on metal surfaces within the boiler. Since cyclohexylamine and morpholine are both considered volatile, they can effectively maintain protective conditions throughout the system without causing significant contamination.

The other substances listed serve different purposes or lack the volatility required for effective use in boiler systems. For instance, ammonium and ammonium hydroxide are typically not used due to their less favorable thermal stability and potential for degradation. Similarly, acetic acid and butyric acid are organic acids that can lead to corrosion rather than mitigate it. Therefore, the combination of cyclohexylamine and morpholine provides an optimal approach for protecting boiler systems.