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Citation: GAI Hongwei, XIAO Ruting. Adsorption Separation of 2, 4-/2, 6-Diaminotoluene on D151 Resin[J]. Chinese Journal of Applied Chemistry, ;2012, 29(10): 1171-1176. doi: 10.3724/SP.J.1095.2012.00495 shu

Adsorption Separation of 2, 4-/2, 6-Diaminotoluene on D151 Resin

GAI Hongwei ,
XIAO Ruting ^,

1.
College of Chemistry and Chemical Engineering, Tianjin University of Technology, Tianjin 300384, China

Corresponding author: XIAO Ruting,
Received Date: 9 November 2011
Available Online: 20 February 2012

The adsorption separation and thermodynamic behavior of 2,4-diaminotoluene and 2,6-diaminotoluene on macropore acrylic acid weak acid cation exchange resin(D151 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 ΔH was-4.3490~-5.7558 kJ/mol,ΔG was-0.2911~-1.0346 kJ/mol,ΔS 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 ΔH was-2.9645~-3.6054 kJ/mol,ΔG was-0.1610~-0.6384 kJ/mol,and ΔS 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.
- D151 resin,
- diaminotoluene,
- adsorption separation
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