Absorption of CO2 in aqueous diglycolamine

被引:31
作者
Al-Juaied, M [1 ]
Rochelle, GT [1 ]
机构
[1] Univ Texas, Dept Chem Engn, Austin, TX 78712 USA
关键词
D O I
10.1021/ie0505458
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
Absorption of CO2 into aqueous DGA (Diglycolamine) was performed at 25-60 degrees C in a wetted-wall column. The absorption data were analyzed using a rigorous model based on eddy diffusivity theory and approximations assuming pseudo-first-order (PFO) and interface pseudo-first-order (IPFO) reactions. The PFO is a good approximation for CO2 absorption into DGA at a CO2 loading of less than 0.2 mol/mol DGA. At CO2 loadings greater than 0.4, instantaneous reactions are approached. The IPFO model matches the rigorous model very well. The second-order rate constant in 65 wt % DGA at 25 degrees C for the reaction with CO2 is four times larger than previously published values, but 25 wt % DGA yields a rate constant which is in good agreement with literature values. This finding Suggests that the second-order rate constant is probably a function of DGA concentration. The second-order rate constant in 65 wt % DGA increases by a factor of 5 from 0 to 0.4 mol CO2/mol DGA. Experiments with 65 wt % DGA + glycolic acid and 65 wt % DGA + potassium formate at 25 degrees C and 40 degrees C showed similar trends. The rate constant increases a factor of 2 to three in these solutions, suggesting that the rate constant is a function of ionic strength.
引用
收藏
页码:2473 / 2482
页数:10
相关论文
共 25 条
  • [1] Kinetics of the reactive absorption of carbon dioxide in high CO2-loaded, concentrated aqueous monoethanolamine solutions
    Aboudheir, A
    Tontiwachwuthikul, P
    Chakma, A
    Idem, R
    [J]. CHEMICAL ENGINEERING SCIENCE, 2003, 58 (23-24) : 5195 - 5210
  • [2] Solubility of carbon dioxide and methane in aqueous methyldiethanolamine solutions
    Addicks, J
    Owren, GA
    Fredheim, AO
    Tangvik, K
    [J]. JOURNAL OF CHEMICAL AND ENGINEERING DATA, 2002, 47 (04) : 855 - 860
  • [3] Al-juaied MA, 2004, THESIS U TEXAS AUSTI
  • [4] PHYSICOCHEMICAL PROPERTIES IMPORTANT FOR CARBON-DIOXIDE ABSORPTION IN AQUEOUS METHYLDIETHANOLAMINE
    ALGHAWAS, HA
    HAGEWIESCHE, DP
    RUIZIBANEZ, G
    SANDALL, OC
    [J]. JOURNAL OF CHEMICAL AND ENGINEERING DATA, 1989, 34 (04) : 385 - 391
  • [5] ALJUAIED MA, 2005, UNPUB J CHEM ENG DAT
  • [6] KINETICS OF REACTIONS OF CARBON-DIOXIDE WITH DIGLYCOLAMINE AND MORPHOLINE
    ALPER, E
    [J]. CHEMICAL ENGINEERING JOURNAL AND THE BIOCHEMICAL ENGINEERING JOURNAL, 1990, 44 (02): : 107 - 111
  • [7] STOPPED-FLOW INVESTIGATIONS OF THE REACTION-KINETICS OF CARBON-DIOXIDE WITH SOME PRIMARY AND SECONDARY ALKANOLAMINES IN AQUEOUS-SOLUTIONS
    BARTH, D
    TONDRE, C
    DELPUECH, JJ
    [J]. INTERNATIONAL JOURNAL OF CHEMICAL KINETICS, 1986, 18 (04) : 445 - 457
  • [8] Bishnoi S., 2000, THESIS U TEXAS AUSTI
  • [9] BLOHM CL, 1955, Patent No. 2712978
  • [10] KINETICS OF CARBAMATE FORMATION AND BREAKDOWN
    CAPLOW, M
    [J]. JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1968, 90 (24) : 6795 - &