| 摘要 |
PURPOSE:To selectively prepare alkylnaphthalene, by mixing metal alkoxides with sulfuric ester and alcohol and adding water to the resulting mixture to gel the same to contain sulfuric acid in amorphous silica-alumina. CONSTITUTION:Metal alkoxides becoming a raw material of silica and alumina are mixed with alcohol and sulfuric ester for a definite time in a solution, and water is added to the resulting mixture to gel the same while the obtained gel is dried to prepare a sulfuric acid-containing silica-alumina catalyst wherein sulfuric acid is contained in silica-alumina. As sulfuric acid ester, dimethyl sulfate and diethyl sulfate are pref. because easy to obtain and the content of sulfuric acid is pref. 3-12wt%. As the silica raw material, lower alkoxysilane is pref. and, as the alumina raw material, aluminum methoxide is pref. By using this catalyst, the acetylation of naphthalene smoothly advances in a position selective manner. |
