title: [Experimental study on CO2 absorption by aqueous ammonia-based blended absorbent].
abstract: A crucial problem for the promising absorbent aqueous ammonia (NH3) is the low CO2 absorption rate. The mass transfer coefficient (K(G)) of CO2 in aqueous NH3-based absorbents on a wetted wall column facility was investigated. Monoethanolamine (MEA), piperazine (PZ), 1-methyl piperazine (1-MPZ) and 2-methyl piperazine (2-MPZ) were introduced into NH3 solutions as additives, all of which significantly increased the mass transfer coefficient of CO2 in the solutions. With CO2 loading of 0, 0.1, 0.3, 0.5 mol x mol(-1), K(G) of 3 mol x L(-1) NH3 + 0.3 mol x L(-1) PZ blended solution increased by 2, 2.2, 2.2, and 1.9 fold as compared to that of 3 mol x L(-1) NH3. Typically, PZ, the additive with best performance, was chosen for further study. The effects of temperature and PZ concentration on CO2 absorption in PZ solution and the blended NH3/PZ solution. The calculated pseudo first order rate constant [42.7 m3 x (mol x s)(-1)] was analyzed to further elucidate the reaction mechanism in the blended NH3/PZ solution.
authors.forename: Zhi-Xiang
authors.initials: ZX
authors.lastname: Xia
authors.forename: Qun-Yang
authors.initials: QY
authors.lastname: Xiang
authors.forename: Xu-Ping
authors.initials: XP
authors.lastname: Zhou
authors.forename: Meng-Xiang
authors.initials: MX
authors.lastname: Fang
mesh_terms: D000641:Ammonia / Q000737:chemistry*; D002245:Carbon Dioxide / Q000737:chemistry*; D019856:Ethanolamine / Q000737:chemistry; D010879:Piperazines / Q000737:chemistry; D012996:Solutions; D013696:Temperature; D014867:Water
chemical_list: D010879:Piperazines; D012996:Solutions; D014867:Water; D002245:Carbon Dioxide; D019856:Ethanolamine; D000641:Ammonia