摘要
从10种树脂中筛选出D151树脂对2,4-二氨基甲苯和2,6-二氨基甲苯的吸附分离及其热力学性质进行了研究。测定了吸附等温线,Freundlich模型对实验的拟合度大于Langmuir模型,其相关系数大于0.99。热力学研究结果表明,在293～313 K条件下,初始质量浓度为60～80 g/L时,2,4-二氨基甲苯的吸附焓变为-4.3490～-5.7558 kJ/mol,自由能变为-0.2911～-1.0346 kJ/mol,吸附熵变为-12.965～-16.150 J/(mol.K);而2,6-二氨基甲苯的吸附焓变为-2.9645～-3.6054 kJ/mol,自由能变为-0.1610～-0.6384 kJ/mol,吸附熵变为-7.939～-11.005 J/(mol.K)。进一步研究了D151树脂对二氨基甲苯的动态吸附分离,可以将2,6-二氨基甲苯含量从20%提高至99.93%,将2,4-二氨基甲苯含量从80%提高至99.42%。
The adsorption separation and thermodynamic behavior of 2, 4-diaminotoluene and 2, 6- diaminotoluene on macropore acrylic acid weak acid cation exchange resin（ D15i resin）, which was selected from ten resins, were investigated. The adsorption isotherms of 2,4-diaminotoluene and 2,6-diaminotoluene were measured. The resuh 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 AH was -4. 3490 ～ -5.7558 k J/tool, AG was -0. 2911 ～ - 1. 0346 kJ/mol, AS 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.
出处
《应用化学》
CAS
CSCD
北大核心
2012年第10期1171-1176,共6页
Chinese Journal of Applied Chemistry
