CIESC Journal ›› 2013, Vol. 64 ›› Issue (5): 1635-1641.DOI: 10.3969/j.issn.0438-1157.2013.05.019

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Preparation and characterization of sulfonated crosslinked chitosan resin as solid acidic catalyst

LI Junhong, XU Yuting, TANG Chengli, LIU Xiong, TAN Yunfei, DONG Lichun   

  1. School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, China
  • Received:2012-08-19 Revised:2012-12-30 Online:2013-05-05 Published:2013-05-05
  • Supported by:

    supported by the National Natural Science Foundation of China(2017620,51272296), the Fundamental Research Funds of Postgraduate Innovation Research for the Central Universities(CDJXS10221140, CDJXS11221169)and the National Innovation Funds for College Students(CDJXS10220006).

磺化交联壳聚糖树脂固体酸催化剂的制备及表征

李俊宏, 徐玉婷, 唐成黎, 刘雄, 谭芸妃, 董立春   

  1. 重庆大学化学化工学院, 重庆 400044
  • 通讯作者: 董立春
  • 作者简介:李俊宏(1988-),男,硕士研究生。
  • 基金资助:

    国家自然科学基金项目(21176270,51272296);中央高校基本科研业务费科研专项"研究生科技创新基金"项目(CDJXS10221140,CDJXS11221169);大学生国家创新基金项目(CDJXS10220006)。

Abstract: Crosslinked chitosan resins(CCRs)with different crosslinking degrees were synthesized by using the inverse emulsion method and glutaraldehyde as crosslinking agent, and then sulfonated at -5℃ with concentrated H2SO4 as sulfonation agent.The properties and application of obtained sulfonated crosslinked chitosan resins(SCCRs)as solid acidic catalysts were studied.IR analysis showed that sulfonation of CCR occurred at both C2 amino groups and C6 secondary hydroxyl groups.Sulfur content measurements demonstrated that the higher the crosslinking degree of the SCCR, the larger the sulfonation rate of its C6 hydroxyl groups.The acidic sites in SCCR including C6-O and C2-N sulfate groups were all weak acidic sites.The acid content of SCCR was much higher than chitosan sulfate reported in the literature,which was prepared by direct sulfonation of chitosan without pre-crosslinking.High-temperature treatment verified that crosslinking improved the thermostability of SCCR.The SCCR with a higher crosslinking degree had better mass retention rate as well as larger sulfur retention rate.The catalytic activity and repeatability of SCCR as solid acidic catalysts were verified by testing its application in the synthesis of tributyl citrate from citric acid and butanol.The results showed that esterification rate of citrate acid could reach 94.8% when SCCR with a 100% crosslinking degree was used, and esterification rate could keep above 92% by repeated use of the SCCR for 6 times.Comparison with chitosan sulfate demonstrated that SCCR was a much better solid acidic catalyst and had a promising application prospect.

Key words: crosslinked chitosan, sulfonated crosslinked chitosan resin, solid acidic catalyst, acid content, thermostability

关键词: 交联壳聚糖, 磺化交联壳聚糖树脂, 固体酸催化剂, 酸量, 热稳定性

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