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- 저자 : Tianrong Zhu (검색결과 3 건)
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A novel membrane on pervaporation performance for dehydration of Caprolactam solution
Qin Li,Yanwen Lin,Tianrong Zhu,Yunbai Luo,Ping Yu 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.2
Konjac glucomannan (KGM) is a kind of polysaccharide with wide applications, except in pervaporation (PV). This article focuses on the new function of KGM and simultaneously improving a new dehydration process for e-Caprolactam (CPL). KGM was cross-linked with glutaraldehyde (GA) at proportions of 0.3,0.5, and 0.7 wt%. Cross-linked membranes were characterized by scanning electron microscope, Fourier transform-infrared, and X-ray diffraction to assess the membranes of morphology, intermolecular interactions, and observe the effects of cross-linking on crystallinity, respectively. Cross-linked KGM as the active layer of the composite membranes has the net matrix structure, and many characteristics improved compared with pure KGM. Data showed that KGM cross-linked with GA displayed good swelling and PV performance, and the composite membranes had superior separation performances in dehydrating the CPL solution. The highest separation factor could reach 3531. The study provided a new way for both KGM application and CPL dehydration.
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Wenhai Lin,Qin Li,Tianrong Zhu 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.3
New porous and rough PVA (polyvinyl alcohol) membranes were synthesized by solvent casting/particulate leaching technique to improve caprolactam (CPL) pervaporation (PV) separation dehydration process. The membranes were characterized by FTIR, SEM, XRD, and contact angle measurements. On account of their special structure, solvent casting/particulate leaching technique membranes showed different surface morphologies compared with the original PVA membrane with enhanced hydrophilicity. By evaluating PV performance and mechanism, a PV transport equation was introduced to evaluate composite membrane permeation flux, separation factor, diffusivity/sorptivity selectivity,and activation energy. The maximum flux obtained in this work was greatly improved to 3.2 kg/m2 h and reached industrial application levels for separating CPL/water mixtures (CPL 70 wt%).
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Wenhai Lin,Qin Li,Tianrong Zhu 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.3
Chitosan/Konjac glucomannan blending membranes were investigated to propose an improved caprolactam pervaporation (PV) dehydration process. The composite membranes were characterized by Fourier transform infrared spectroscopy, scanning electron microscopy, X-ray diffraction and differential scanning calorimetry measurements to assess the intermolecular interactions of membranes. The effects of different temperature, CPL concentration in feed and KGM proportion in the membranes on the pervaporation performance were investigated. Data showed that KGM/CS blending membranes displayed good swelling and pervaporation performance, and the blending membrane M-1 had superior separation factor exceed 3000 at every temperature for 70 wt.% caprolactam. The results revealed that the separation performances of KGM/CS blending membranes were strongly related to their reaction degree, intrinsic structure and operating parameters.
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