| 摘要 |
PURPOSE:To prepare the titled compound in high ortho-selectivity, without causing decomposition of methanol, by methylating a specific phenolic compound in the presence of a long-life catalyst containing iron oxide and obtained by maintaining an aqueous solution containing an iron compound within a specific pH range, and calcining the product. CONSTITUTION:An ortho-methylated phenolic compound (e.g. 2,6-xylenol) can be prepared by the thermal reaction of a phenolic compound having hydrogen atom at ortho position, e.g. phenol, cresol, etc. with methanol. The reaction is carried out in the presence of a catalyst composed mainly of iron oxide and obtained by maintaining an aqueous solution containing an iron compound as main component at pH>=8, pref. 8.5-13, esp. pref. 9-11, and calcining the resulted dispersion containing colloidal iron hydroxide as main component or calcining the solid mixture obtained by drying the above dispersion. The catalyst contains a small amount of gallium oxide, geermanium oxide, hafnium oxide, etc. as an auxiliary component. |
