Tetramethoxysilane → Tetraethoxysilane

Participants

Reaction Steps

Similar product, containing less than 0.3% 3-chloropropylmethoxydiethoxysilane, was prepared under similar conditions except that an ethanol/methanol mixture (96% ethanol) was fed at midpoint of the first column with pure ethanol being fed to its bottom flask and dodecylbenzenesulfonic acid (0.2 wt-% relative to starting silane) was used as the transesterification catalyst. This demonstrates the effective use of a less pure recycle stream, which is significant, since 100% molar excess of ethanol is used. 3-Chloropropyltriethoxysilane of similar relative purity (low 3-chloropropylmethoxydiethoxysilane content) was prepared when the feed contained several percent tetramethoxysilane, providing 7% tetraethoxysilane in the product stream.

Provenance & Evidence