Extraction of template agents from porous silica using supercritical carbon dioxide-entrainer method

Ikuo Ushiki, Shogo Teratani, Masaki Ota, Yoshiyuki Sato, Hiroshi Inomata

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

Supercritical fluid extraction of template agents, CTAH (Cetylrimethylammonium hydroxide) and EPE (EO20-PO70-EO20) from mesoporous silica was carried out at 80°C, 8 to 14MPa and extraction time of 1 to 7h. The time evolution of templates showed that CTAH was removed after EPE. Among the three alcohols, including methanol, ethanol and 1-propanol as entrainers, methanol was the most efficient solvent that gave 95% recovery of CTAH. This seems to be caused by molecular size and polarity of entrainer. Supercritical carbon dioxide-entrainer method showed high recovery of template agents compared to organic solvent methods. Pore size of silica affected pressure dependence of template recovery, which indicated differences in interaction between pore wall and template. Optimization of extraction condition was achieved by selecting suitable pressure and entrainer for providing better balance of entrainer penetration and extraction power.

Original languageEnglish
Pages (from-to)512-517
Number of pages6
Journalkagaku kogaku ronbunshu
Volume37
Issue number6
DOIs
Publication statusPublished - 2011 Jan 1

Keywords

  • Entrainer
  • Extraction
  • Porous silica
  • Supercritical carbon dioxide

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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