摘要
在200mL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27MPa,夹带剂流量4mL/min,萃取时间1.5h,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.
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.
出处
《过程工程学报》
CAS
CSCD
北大核心
2012年第1期64-67,共4页
The Chinese Journal of Process Engineering
基金
中央高校基本科研业务费资助项目(编号:ZZ1103)
