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›› 2012, Vol. 12 ›› Issue (1): 64-67.

• 反应与分离 • 上一篇    下一篇

超临界CO2萃取回收SBA-15中的有机模板剂

苏广训 金君素 崔文广 刘洪涛 张泽廷   

  1. 北京化工大学 北京化工大学化学工程学院 北京化工大学化学工程学院 北京化工大学化学工程学院 北京化工大学化学工程学院
  • 收稿日期:2011-07-20 修回日期:2011-09-23 出版日期:2012-02-20 发布日期:2012-02-20
  • 通讯作者: 苏广训

Recovery of Organic Template from SBA-15 Using Supercritical Carbon Dioxide Extraction

SU Guang-xun JIN Jun-su CUI Wen-guang LIU Hong-tao ZHANG Ze-ting   

  1. Beijing University of Chemical Technology College of Chemical Engineering, Beijing University of Chemical Technology College of Chemical Engineering, Beijing University of Chemical Technology College of Chemical Engineering, Beijing University of Chemical Technology Beijing University of Chemical Technology
  • Received:2011-07-20 Revised:2011-09-23 Online:2012-02-20 Published:2012-02-20
  • Contact: SU Guang-xun

摘要: 在200 mL高压萃取釜内,对含夹带剂的超临界CO2萃取回收SBA-15中有机模板剂P123(EO20PO70EO20)的最佳工艺条件进行了研究,考察了夹带剂种类、萃取温度、萃取压力、夹带剂流量对回收率的影响,确定最佳萃取工艺条件为:甲醇作夹带剂,温度45℃,压力27 MPa,夹带剂流量4 mL/min,萃取时间1.5 h,在此条件下P123回收率可达73.7%. 对不同方法脱除P123后的SBA-15进行了表征,结果表明,含甲醇夹带剂的超临界CO2萃取法是一种高效环保的方法,且得到的SBA-15保留了很好的骨架有序性,不会造成骨架硅羟基脱除,克服了高温焙烧脱除模板剂造成的孔道收缩问题.

关键词: 模板剂回收, SBA-15, 超临界CO2萃取, 夹带剂

Abstract: The optimum conditions to recover organic template P123 (EO20PO70EO20) from SBA-15 using supercritical carbon dioxide extraction with cosolvents were studied in a 200 mL high pressure extraction vessel. The effects of cosolvent, extraction temperature, extraction pressure, and cosolvent flow rate on recovery rate were studied. The results showed that under the optimal operating conditions of methanol as cosolvent, extraction temperature 45℃, extraction pressure 27 MPa, cosolvent flow rate 4 mL/min, and extraction time 1.5 h, the recovery rate of template P123 was 73.7%. SBA-15 obtained by different methods was characterized. The results indicated methanol-modified supercritical carbon dioxide extraction was an efficient and environmental friendly method. The obtained SBA-15 maintained highly ordered framework. The recovery process of supercritical carbon dioxide extraction can avoid the structure shrinkage and silanol group removal caused by high thermal calcination.

Key words: template recovery, SBA-15, supercritical carbon dioxide extraction, cosolvent

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