...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Fuel >Sulfonated polystyrene: A catalyst with acid and superabsorbent properties for the esterification of fatty acids
【24h】

Sulfonated polystyrene: A catalyst with acid and superabsorbent properties for the esterification of fatty acids

机译：磺化聚苯乙烯：具有酸和超吸收性的脂肪酸酯化催化剂

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

In this work, catalysts with acid and superabsorbent properties were obtained by sulfonation of expanded polystyrene and used to promote the esterification of oleic acid with ethanol. The prepared superabsorbent polymers (SAP) showed high concentration of active sulfonic acid sites (0.7-5.9 mmol acid sites g~(-1)) and high water absorption capacity (445-900 g_(water) g~(-1)). It was observed that the catalytic activity increased with the number of acid site and water absorption capacity. Turnover frequencies suggested that the catalytic activity depends on the accessibility/diffusion processes determined by the crosslinks in the polymer. Commercial sulfonic acid resins and polyacrylate based superabsorbent polymers showed very low activities compared with the SAP produced. The SAP also showed higher activity compared to the homogeneous catalyst p-toluenesulfcmic acid. The higher activity of the prepared SAP is discussed in terms of the acidity of sulfonic groups combined with the water absorption which shifts the esterification equilibrium.
机译：在这项工作中，通过膨胀聚苯乙烯的磺化获得具有酸和超吸收性能的催化剂，并用于促进油酸与乙醇的酯化。所制备的超吸收性聚合物（SAP）显示出高浓度的活性磺酸位点（0.7-5.9 mmol酸位点g〜（-1））和高吸水能力（445-900 g_（水）g〜（-1））。观察到催化活性随酸位点数和吸水能力的增加而增加。周转频率表明催化活性取决于聚合物中交联键决定的可及性/扩散过程。与生产的SAP相比，商业磺酸树脂和聚丙烯酸酯基超吸收性聚合物的活性非常低。与均相催化剂对甲苯磺酸相比，SAP还显示出更高的活性。关于磺酸基团的酸度与改变酯化平衡的吸水率，讨论了制备的SAP的较高活性。

著录项

  • 来源
    《Fuel》 |2010年第1期|257-259|共3页
  • 作者

    Camila Vieira Grossi; Erika de Oliveira Jardim; Maria Helena de Araujo; Rochel Montero Lago; Marcio Jose da Silva;

  • 作者单位

    Departamento de Quimica, Univers dade Federal de Vicosa Vicosa, Minas Gerais 36570-000, Brazil;

    Departamentc de Quimica, Universidude federal Minas Gerais, ICEx, Belo Horizonte, Minas Gerais 31270-901, Brazil;

    Departamentc de Quimica, Universidude federal Minas Gerais, ICEx, Belo Horizonte, Minas Gerais 31270-901, Brazil;

    Departamentc de Quimica, Universidude federal Minas Gerais, ICEx, Belo Horizonte, Minas Gerais 31270-901, Brazil;

    Departamento de Quimica, Univers dade Federal de Vicosa Vicosa, Minas Gerais 36570-000, Brazil;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    catalytic esterification; free fatty acids; polystyrenesu fonic acid; superabsorbent;

    机译：催化酯化游离脂肪酸;聚苯乙烯磺酸超吸收剂;

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号