Removal of Benzaldehyde from Methanol Using Alkoxyamine Functionalized Silica Gel

Dino Sulejmanovic, Western Kentucky University
Carrie Jo Pruitt, Western Kentucky University
Eric Conte, Western Kentucky University
Hasan Palandoken, Western Kentucky University
Shing-Yi Suen, National Chung Hsing University, Taichung

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Copyright © 2008 American Chemical Society .

NOTE: At the time of publication, the author Hasan Palandoken was not yet affiliated with Cal Poly.

Abstract

Alkoxyamines (RONH₂) react readily with aldehydes and ketones to form stable oxime ethers, and, thus are expected to be excellent scavengers of these compounds. We installed alkoxyamines on silica gel surface to remove benzaldehyde from methanol. Silica gel was immersed in H₂O₂/H₂SO₄ solution to activate the surface. Activated silica gel was then reacted with 3-chloropropyltrichlorosilane. Displacement of the chloride with N-hydroxyphthalimide and subsequent treatment with hydrazine provided alkoxyamines on the surface of silica gel. The resulting silica gel surface with alkoxyamine functional groups was immersed in a 100 ppm benzaldehyde solution in methanol. After 24 h, the results showed 86.5 + 7.2 % removal of benzaldehyde from methanol.