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首页> 外文期刊>Journal of Chemical Technology & Biotechnology >Pervaporation of tertiary butanol/water mixtures through chitosan membranes cross-linked with toluylene diisocyanate
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Pervaporation of tertiary butanol/water mixtures through chitosan membranes cross-linked with toluylene diisocyanate

机译：叔丁醇/水混合物通过与甲苯二异氰酸酯交联的壳聚糖膜的全蒸发

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摘要

Membranes made from 84% deacetylated chitosan biopolymer were cross-linked by a novel method using 2,4-toluylene diisocyanate (TDI) and tested for the separation of t-butanol/water mixtures by pervaporation. The unmodified and cross-linked membranes were characterized by Fourier transform infra red (FTIR) spectroscopy, X-ray diffraction (XRD) studies and sorption studies in order to understand the polymer-liquid interactions and separation mechanisms. Thermal stability was analyzed by differential scanning calorimetry (DSC) and thermo gravimetric analysis (TGA) while tensile strength measurement was carried out to assess mechanical strength. The membrane appears to have good potential for breaking the aqueous azeotrope of 88.2 wt% t-butanol by giving a high selectivity of 620 and substantial water flux (0.38 kg m(-2) hr(-1)). The effects of operating parameters such as feed composition, membrane thickness and permeate pressure on membrane performance were evaluated. (c) 2005 Society of Chemical Industry.
机译：由84％脱乙酰壳聚糖生物聚合物制成的膜通过一种新方法使用2,4-甲苯二异氰酸酯（TDI）进行交联，并通过全蒸发测试了叔丁醇/水混合物的分离。通过傅立叶变换红外（FTIR）光谱，X射线衍射（XRD）研究和吸附研究对未改性和交联的膜进行了表征，以了解聚合物与液体的相互作用和分离机理。通过差示扫描量热法（DSC）和热重分析（TGA）分析热稳定性，同时进行拉伸强度测量以评估机械强度。通过提供620的高选择性和相当大的水通量（0.38 kg m（-2）hr（-1）），该膜似乎具有打破88.2 wt％叔丁醇水共沸物的良好潜力。评估了操作参数（例如进料组成，膜厚度和渗透压力）对膜性能的影响。 （c）2005年化学工业协会。

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