摘要
Abstract
The adsorption separation and thermodynamic behavior of 2, 4-diaminotoluene and 2,6-diaminotoluene on macropore acrylic acid weak acid cation exchange resin(Dl51 resin) , which was selected from ten resins, were investigated. The adsorption isotherms of 2,4-diaminotoluene and 2,6-diaminotoluene were measured. The result showed that the adsorption isotherm curves of 2, 4-diaminotoluene and 2, 6-diaminotoluene on D151 resin fitted Freundlich adsorption isotherm better than Langmuir with the correlation coefficient larger than 0. 99. The study of thermodynamics showed that when the initial concentration of 2,4-
diaminotoluene were 60～80 g/L within 293～313 K, the adsorption △H was -4. 3490～-5. 7558 kJ/mol,
AG was -0. 2911～ - 1. 0346 kJ/mol, △S was - 12. 965 ～ - 16. 150 J/( mol ? K); and when the initial concentration of 2,6-diaminotoluene were 60 ～80 g/L within 293 -313 K, adsorption AH was -2.9645 --3.6054 kJ/mol, AG was -0. 1610 ～ -0.6384 kJ/mol, and AS was -7.939～ - 11.005 J/(mol·K). The results show that the concentration of 2,6-diaminotoluene can be enriched from 20% to 99.93% , and 2,4-diaminotoluene can be increased from 80% to 99. 42% with the dynamic adsorption separation.关键词
D151树脂/二氨基甲苯/吸附分离Key words
D151 resin/diaminotoluene/adsorption separation分类
化学化工
