THERMODYNAMICS OF ALKANOLAMINE WATER SOLUTIONS FROM FREEZING-POINT MEASUREMENTS

被引:61
作者
CHANG, HT [1 ]
POSEY, M [1 ]
ROCHELLE, GT [1 ]
机构
[1] UNIV TEXAS,DEPT CHEM ENGN,AUSTIN,TX 78712
关键词
D O I
10.1021/ie00022a016
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
The water freezing point has been measured in several amine-water systems. The water activity coefficient derived from these measurements by regression with the nonrandom two-liquid (NRTL) model shows strong interactions in the MDEA-water binary system near 0-degrees-C. The apparent solution nonideality sequence in the amine-water system at low temperature (about 0-degrees-C) and dilute amine solution (up to 13 mol %) is methyldiethanolamine (MDEA) almost-equal-to diglycolamine (DGA) > dimethylmonoethanolamine (DMMEA) > triethanolamine (TEA) > diethanolamine (DEA) > monoethanolamine (MEA). The combined regression of freezing point depression data and total vapor pressure data predicts a significant temperature dependence of the solution properties. At 120-degrees-C, the expected solution nonideality sequence is DEA > DGA almost-equal-to MEA > MDEA. The parameters for activity coefficients from regression of these data should be useful for predicting acid gas solubility in these systems.
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页码:2324 / 2335
页数:12
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