首页> 中文期刊> 《化工学报》 >一体式流化床膜反应器合成二甲基二氯硅烷

一体式流化床膜反应器合成二甲基二氯硅烷

         

摘要

A fluidized bed reactor was coupled with a ceramic membrane to construct a integrated fluidized bed membrane reactor for synthesis of dimethyldichlorosilane. The effects of catalyst concentration, back flush on reaction and membrane separation performance were studied. The ceramic membrane and the contact mass before and after reaction were characterized. Selectivity of dimethyldichlorosilane could be maintained above 85% and conversion ratio of silicon increased with increasing catalyst concentration, when catalyst concentration was less than 4%(mass). When catalyst concentration was in the range of 4%-8%, selectivity of dimethyldichlorosilane decreased slightly, but decreased obviously when catalyst concentration was above 8%. The particle size of the contact mass decreased after reaction. The carbon that deposited on the surface of silicon increased with increasing catalyst concentration. Two layers of filter cake formed on the membrane surface during the reaction process. The inner cake was copper, and the outer one was carbon. Under different catalyst concentrations, rejection of dust by the ceramic membrane could reach 100%. The change of trans-membrane pressure was little in the reactionprocess and back flush could increase silicon conversion.%提出将陶瓷膜与流化床反应器耦合构成一体式流化床膜反应器,用于直接法合成二甲基二氯硅烷。实验考察了催化剂浓度、脉冲反吹对反应效率和膜分离性能的影响,并对反应前后的触体及陶瓷膜进行了表征。结果表明,催化剂浓度小于4%(质量)时,二甲基二氯硅烷的选择性均可维持在85%以上,硅粉转化率随催化剂浓度的增大而增大;催化剂浓度在4%~8%时,二甲基二氯硅烷的选择性随催化剂浓度增加而略有下降,当催化剂浓度大于8%时,二甲基二氯硅烷选择性明显下降。触体失活后粒径减小,硅粉表面积碳随催化剂浓度的增加而升高。陶瓷膜表面形成内外两层滤饼,内层滤饼主要成分为铜,外层滤饼主要成分为碳;不同催化剂浓度下,陶瓷膜对粉尘的截留率均可达100%,反应过程中跨膜压差随时间变化较小,脉冲反吹可增加硅粉转化率。

著录项

  • 来源
    《化工学报》 |2014年第7期|2776-2784|共9页
  • 作者单位

    南京工业大学膜科学技术研究所;

    材料化学工程国家重点实验室;

    江苏南京 210009;

    南京工业大学膜科学技术研究所;

    材料化学工程国家重点实验室;

    江苏南京 210009;

    南京工业大学膜科学技术研究所;

    材料化学工程国家重点实验室;

    江苏南京 210009;

    南京工业大学膜科学技术研究所;

    材料化学工程国家重点实验室;

    江苏南京 210009;

    南京工业大学膜科学技术研究所;

    材料化学工程国家重点实验室;

    江苏南京 210009;

    南京工业大学膜科学技术研究所;

    材料化学工程国家重点实验室;

    江苏南京 210009;

  • 原文格式 PDF
  • 正文语种 chi
  • 中图分类 硅有机化合物;
  • 关键词

    陶瓷膜; 流化床; 二甲基二氯硅烷; 反吹;

相似文献

  • 中文文献
  • 外文文献
  • 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