• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>RSC Advances >The effect of NaOH on lowering interfacial tension of oil/alkylbenzene sulfonates solution
【24h】

The effect of NaOH on lowering interfacial tension of oil/alkylbenzene sulfonates solution

机译：NaOH对油/烷基苯磺酸盐溶液降低界面张力的影响

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

Six sodium para-dimethyl alkylbenzene sulfonates (PDABS, abbr. p-S12-5, p-S14-5, p-S16-5, p-S18-5, pS16-6 and p-S16-8, respectively) have been synthesized. The structures and the purities of the products have also been confirmed by H-1-NMR and mass spectrometry. Crude oil and its equivalent alkanes were chosen as oil phases. The effect of the NaOH concentration on the interfacial tension (IFT) of PDABS was investigated by using a spinning drop tensiometer. The results showed that, in a certain range of NaOH concentrations, p-S14-5, p-S16-5 and p-S18-5 produced ultra-low IFT (similar to 10(-3) mN m(-1)). NaOH was roughly similar to NaCl in aqueous solutions in terms of its effect on interfacial concentration and arrangement of PDABS at the interface. With the increase in the concentration of NaOH, the electric double layer of hydrophilic groups in PDABS was compressed to become smaller and the electrostatic interactions between hydrophilic groups weakened, which resulted in an increase in interfacial concentration of PDABS. Continuing to increase the concentration of NaOH, the electrical double layer was further compressed; water molecules could incorporate into the interface through loose hydrophilic groups. Therefore, these two aspects of variations caused IFT to display the trend of decreasing and then increasing with increase of NaOH concentration. However, at higher NaOH concentrations, PDABS molecules were driven into the oil phase by the salting out effect, and this process resulted in a decrease of IFT for water-soluble p-S12-5 and p-S14-5. For oil soluble p-S18-5, this process had little effect on the effective distribution in the oil phase. The effective distribution of PDABS in the oil phase played an important role in stabilizing the interface and reducing IFT. There was no clear evidence that NaOH reduced the IFT between oil and water by showing a synergistic effect between PDABS and active species formed in situ with acidic components in the crude oil.
机译：六个钠对二甲基烷基苯磺酸盐（PDABs，ABBR。P-S12-5，P-S14-5，P-S16-5，P-S14-5，PS16-6和P-S18-5）已经存在合成。本发明的结构和纯度也得到了H-1-NMR和质谱法证实。选择原油及其等同的烷烃作为油阶段。通过使用旋转滴压计研究了NaOH浓度对PDAB的界面张力（IFT）的影响。结果表明，在一定的NaOH浓度范围内，P-S14-5，P-S16-5和P-S18-5产生超低IFT（类似于10（-3）MN M（-1）） 。 NaOH在其对界面界面浓度和Pdabs的界面浓度和布置的影响方面大致类似于水溶液中的NaCl。随着NaOH浓度的增加，Pdab中的亲水基团的电双层被压缩以变得更小，亲水基团之间的静电相互作用削弱，这导致Pdab的界面浓度增加。继续增加NaOH的浓度，进一步压缩电双层;水分子可以通过松散的亲水基团掺入界面中。因此，这两个方面的变化导致iFT显示出降低的趋势，然后随着NaOH浓度的增加而增加。然而，在更高的NaOH浓度下，通过盐析效果被驱动到油相中的PDABs分子，并且该过程导致用于水溶性P-S12-5和P-S14-5的IFT的降低。对于油溶性P-S18-5，该方法对油相的有效分布几乎没有影响。 Pdabs在油相中的有效分布在稳定界面和减少IFT方面发挥了重要作用。没有明确的证据证明NaOH通过在原油中原位形成的PDAB和活性物种之间的协同作用减少油和水之间的IFT。

著录项

  • 来源
    《RSC Advances》 |2018年第11期|共9页
  • 作者

    Zhao Changming; Jiang Yulian; Li Mengwei; Cheng Tiexin; Yang Wensheng; Zhou Guangdong;

  • 作者单位

    Jilin Univ Coll Chem Changchun 130061 Jilin Peoples R China;

    Jilin Univ Coll Chem Changchun 130061 Jilin Peoples R China;

    Jilin Univ Coll Chem Changchun 130061 Jilin Peoples R China;

    Jilin Univ Coll Chem Changchun 130061 Jilin Peoples R China;

    Jilin Univ Coll Chem Changchun 130061 Jilin Peoples R China;

    Jilin Univ Coll Chem Changchun 130061 Jilin Peoples R China;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
  • 关键词

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