(84d) Formation of Nitrosamines in the Desorber of Tertiary Amine-Based Carbon Dioxide Capture Systems
In this work, the influences of amine structural characteristics and desorber conditions on the formation of nitrosamines were investigated. Generally, tertiary amines were less reactive towards nitrosamines comparing with secondary amines. The formation of total nitrosamine from tertiary amine was first-order dependent on nitrite concentration and CO2 loading, but was not dependent on amine concentration. For tertiary amines with the same number of 2-hydroxyethyl groups, less hindered amines showed faster nitrosamine formation and higher nitrosamine yields based on nitrite consumption. The distribution of specific nitrosamine formation from tertiary alkanolamines implied the preferential cleavage of 2-hydroxyethyl group over methyl group, but comparable to ethyl group, and therefore shed light on the nitrosation mechanisms.