Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.seppur.2010.11.029
Title: Organic template removal from hexagonal mesoporous silica by means of methanol-enhanced CO2 extraction: Effect of temperature, pressure and flow rate
Authors: Huang, Z.
Xu, L.
Li, J.-H.
Kawi, S. 
Goh, A.H.
Keywords: Amine removal
Mesoporous materials
Methanol
Supercritical fluid extraction
Issue Date: 2-Feb-2011
Source: Huang, Z., Xu, L., Li, J.-H., Kawi, S., Goh, A.H. (2011-02-02). Organic template removal from hexagonal mesoporous silica by means of methanol-enhanced CO2 extraction: Effect of temperature, pressure and flow rate. Separation and Purification Technology 77 (1) : 112-119. ScholarBank@NUS Repository. https://doi.org/10.1016/j.seppur.2010.11.029
Abstract: 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 4.5 ml/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 N 2 adsorption results, and thus have higher thermal and hydrothermal stability than those obtained by liquid ethanol extraction or high temperature calcination. © 2010 Elsevier B.V. All rights reserved.
Source Title: Separation and Purification Technology
URI: http://scholarbank.nus.edu.sg/handle/10635/89693
ISSN: 13835866
DOI: 10.1016/j.seppur.2010.11.029
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