What are the two key impurities removed using amine?

The key impurities removed using amine are hydrogen sulfide (H2S) and carbon dioxide (CO2), which is why the correct selection centers around these two components. Amines, especially in the context of natural gas treatment or refinery processes, are utilized for gas sweetening. This process specifically targets the removal of acidic gases, primarily H2S and CO2, which can be corrosive and detrimental to equipment and can negatively impact the quality of the end product.

The amine solutions react chemically with H2S and CO2, forming stable complexes that can be separated from the hydrocarbon stream. This is crucial for ensuring that the final gas or liquid product meets regulatory and quality standards, particularly in minimizing the toxicity and corrosiveness associated with H2S and CO2.

Other options incorrectly identify different impurities that are not typically targets of amine treatment in refinery processes. Nitriles and sulfides, for example, do not usually interact with amine solutions in the same way as the acidic gases, while ammonia is not a primary target of amine technology. Additionally, chlorinated compounds pose different types of challenges that amines aren't suited to address. Thus, focusing on the removal of H2S and CO2 reflects the fundamental application