KOAc/NaY催化合成邻甲基苯甲醚

Synthesis of o-Methoxy Toluene on KOAc/NaY Catalyst

以KOAc／NaY为催化剂，在连续流动固定床反应器内，邻甲基苯酚（OC）与碳酸二甲酯（DMC）经过气固相催化反应合成了邻甲基苯甲醚（OM）。考察了内、外扩散对KOAc／NaY催化剂活性的影响。实验结果表明，当气流线速度大于30cm／min时可消除外扩散对合成反应的影响；当KOAc／NaY催化剂的平均粒径在0．30～0．75mm（20～80目的颗粒）时能消除内扩散对合成反应的影响。在消除内、外扩散效应后，还考察了反应温度、原料配比、空速对合成反应的影响，得到较佳的反应条件：催化剂5mL，反应温度548K，反应压力0．6MPa，空速0．6h^-1，n（DMC）：n（OC）=1，在线评价时间7h。在此条件下，OC的转化率高达85．7％，OM的选择性大于99％。

Synthesis of o-methoxy toluene from o-cresol and methyl-carbonate （DMC）on KOAc/ NaY catalyst in fixed bed reactor was investigated. Effects of internal diffusion and external diffusion could be excluded when feed linear velocity was more than 30 cm/s and catalytic particle diameters were in the range of 0.30 - 0.75 mm （20 - 80 mesh ）. Yield and selectivity of o-methoxytoluene increased with rising of reaction temperature, but coke deposit occurred because of decomposition of DMC when temperature rose to 608 K. High o-cresol conversion and high by-product yield could be obtained at high n （DMC） ： n （o-cresol）. When contact time decreased by changing weight hourly space velocity （WHSV）, conversion of o-cresol decreased considerably. Under optimal reaction conditions ： temperature 548 K, WHSV 0.6 h^-1, n （ DMC ） ： n （ o-cresol ） 1, catalyst 5 mL, pressure 0.6 MPa and on-line time 7 h, o-cresol conversion and o-methoxy toluene selectivity could reached 85.3 % and 99.7 %, respectively.