Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5746330 | Chemosphere | 2017 | 9 Pages |
â¢The feasibility of LA separation by a hyper-crossed-linked polymer was verified.â¢The equilibrium, kinetic and thermodynamic properties of LA adsorption was studied.â¢The process of LA from actual biomass hydrolysate was studied for the first time.â¢The concentration of LA in the eluent was increased by 2.97 folds.
The recovery of levulinic acid (LA) from aqueous solution and actual biomass hydrolysate by a microporous hyper-cross-linked polymer, SY-01, was investigated for the first time under batch and fixed-bed column conditions. The results showed that the optimum pH should be in the acidic range (pHÂ <Â 3.0) without adjusting the pH. In the single-component system equilibrium study, the Langmuir isotherm model fits the LA adsorption onto SY-01 resin better than the Freundlich isotherm model, indicating that LA adsorption onto SY-01 resin under the concentration range studied is a monolayer homogeneous adsorption process. The maximum adsorption capacity of LA onto SY-01 resin decreased with increasing temperature, ranging from 103.74 to 95.70Â mg/g. The obtained thermodynamic parameters suggested that the adsorption of LA on SY-01 was spontaneous (ÎG0<â3.788Â kJ/mol), and exothermic (ÎH0Â =Â â11.764Â kJ/mol). For kinetic study, the adsorption of LA onto SY-01 resin at various operating conditions follows the pore diffusion model and the intraparticle diffusion is the rate-limiting step for the adsorption of LA onto SY-01 resin. The effective pore diffusivity was dependent upon temperature, but independent of initial LA concentration, and were 3.306Â ÃÂ 10â10, 5.274Â ÃÂ 10â10 and 7.707Â ÃÂ 10â10Â m2/s at 298, 318 and 338Â K, respectively. In desorption process, the recovery efficiency of LA from SY-01 resin was 99.39%, and LA concentration in the eluent was raised 2.97-fold. In conclusion, our results show that the SY-01 resin has potential application in product recovery of LA from biomass hydrolysate.
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