title: [CO2 absorption and regeneration performance of a natural amino acid and its potassium salt].
abstract: In order to decrease the solvent loss due to amine volatilization and oxidative degradation and reduce the risk of environmental pollution resulting from amine volatilization, amino acid salts with negligible volatility and better resistance to oxidative degradation may be considered as the alternative during the course of CO2 capture. So, experimental study on CO2 absorption and regeneration characteristics of L-arginine and potassium argininate (PA) was put forward in this study based on the CO2 absorption rate and heating regeneration rate at ambient pressure. And the influences of absorbent mass concentration, reaction temperature and absorption-regeneration cycles on CO2 absorption performance of L-arginine and PA were also investigated, which were used to compare with the typical absorbents including monoethanolamine (MEA), diethanolamine (DEA) and triethanolamine (TEA). Results showed that among all the five absorbents, PA had the highest CO2 absorption rate of 24.5 x 10(-3) mol x (L x min)(-1) and CO2 loading capacity of 1.99 mol x mol(-1), which were 2.1% and 290.2% higher than MEA with the same mass concentration, respectively. The results also showed that CO2 absorption rate of PA and MEA at 40 degrees C was the highest compared to other temperatures. In addition, although CO2 loading of lean PA solution was slightly higher than that of MEA under the same regeneration conditions, 72.8% CO2 in the rich PA solution can be released, which is 19% higher than that of MEA. After three absorption-regeneration cycles, CO2 absorption capacity of 10% PA was found to be approximate 1.03 mol x mol(-1), which is 255.2% higher than MEA. Furthermore, L-arginine was found to have the stronger CO2 absorption capacity, and its CO2 absorption rate may be comparable to DEA with the same mass concentration.
authors.affiliation: College of Engineering, Huazhong Agricultural University, Wuhan 430070, China. yanshp@mail.hzau.edu.cn
authors.forename: Shui-Ping
authors.initials: SP
authors.lastname: Yan
authors.forename: Jing-Ao
authors.initials: JA
authors.lastname: Chen
authors.forename: Ming-Liang
authors.initials: ML
authors.lastname: Xu
authors.forename: Ping
authors.initials: P
authors.lastname: Ai
authors.forename: Yan-Lin
authors.initials: YL
authors.lastname: Zhang
mesh_terms: D000327:Adsorption; D000596:Amino Acids / Q000737:chemistry*; D001120:Arginine / Q000737:chemistry; D002245:Carbon Dioxide / Q000737:chemistry* / Q000302:isolation & purification*; D019856:Ethanolamine / Q000737:chemistry; D011188:Potassium / Q000737:chemistry*
chemical_list: D000596:Amino Acids; D002245:Carbon Dioxide; D019856:Ethanolamine; D001120:Arginine; D011188:Potassium