부산대학교 도서관

Developing ideal amine solvents with a high CO2absorption capacity and a fast absorption rate is an attractive avenue to advance the amine scrubbing technology. In this regard, diamines bearing one primary and one tertiary amino group (1°/3° diamines) are proposed to be promising solvents for CO2absorption, which can exhibit the fast CO2absorption rate of primary amines while maintaining the diamines’ intrinsic high absorption capacity. Here, we present a detailed kinetic study of four 1°/3° diamines for CO2absorption and investigate the relationship between the structure of various 1°/3° diamines and their CO2absorption rate. Results showed that increasing alkyl spacer between two amino groups within 1°/3° diamines promoted the CO2absorption rate, while a large decrease in their reactivity with CO2was observed when the tertiary amino group existed in the cyclic structure. Among these studied 1°/3° diamines, 3-(dimethylamino)-1-propylamine (DMAPA) displayed the highest absorption rate under relevant conditions and also exhibited higher overall mass transfer coefficients than those of monoethanolamine over the entire range of CO2loadings, and the main reaction routes for CO2absorption into DMAPA solution via formation of the protonated DMAPA-carbamate were proposed.