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首页> 外文期刊>Separation and Purification Technology >Organic template removal from hexagonal mesoporous silica by means of methanol-enhanced CO2 extraction: Effect of temperature, pressure and flow rate
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Organic template removal from hexagonal mesoporous silica by means of methanol-enhanced CO2 extraction: Effect of temperature, pressure and flow rate

机译：通过甲醇增强的CO2萃取从六角形介孔二氧化硅中去除有机模板：温度，压力和流速的影响

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摘要

Supercritical fluid extraction was evaluated for removing the amine surfactant from hexagonal mesoporous silica materials. In this study, methanol-enhanced supercritical CO2 extraction was carried out on freshly synthesized materials by means of a dynamic method. Experiments were performed at pressure ranging from 10.0 to 25.0 MPa, temperature from 45 to 105 °C, CO2 flow rate from 0.45 to 4.5ml/min, and methanol flow rate from 0.05 to 0.5 ml/min. The influence of these parameters on the extraction has been evaluated in terms of the surfactant recovery. The results show that by using this method up to 96% of the total amine surfactant used is extracted out of as-synthesized mesoporous materials within 1 h extraction whereas only 78% of the surfactant can be removed by liquid ethanol extraction. The materials processed by supercritical CO2 extraction are found to possess better structural properties as reflected by the X-ray diffraction analysis and N2 adsorption results, and thus have higher thermal and hydrothermal stability than those obtained by liquid ethanol extraction or high temperature calcination.
机译：评价超临界流体萃取以从六方介孔二氧化硅材料中除去胺表面活性剂。在这项研究中，采用动态方法对新合成的材料进行了甲醇增强的超临界CO2萃取。在10.0至25.0 MPa的压力，45至105℃的温度，0.45至4.5ml / min的CO2流速和0.05至0.5 ml / min的甲醇流速下进行实验。这些参数对萃取的影响已根据表面活性剂的回收率进行了评估。结果表明，使用这种方法，在1 h的萃取过程中，最多可从所用的合成介孔材料中萃取出96％的总胺表面活性剂，而通过液体乙醇萃取只能去除78％的表面活性剂。 X射线衍射分析和N2吸附结果表明，通过超临界CO2萃取处理的材料具有更好的结构性能，因此比通过液体乙醇萃取或高温煅烧获得的材料具有更高的热稳定性和水热稳定性。

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