Recovery of Organic Template from SBA-15 Using Supercritical Carbon Dioxide Extraction
超临界CO2萃取回收SBA-15中的有机模板剂

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.