KOAc/NaY催化合成邻甲基苯甲醚

以KOA c/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KOA c/NaY催化剂活性的影响。实验结果表明,当气流线速度大于30cm/m in时可消除外扩散对合成反应的影响;当KOA c/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0.6M Pa,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 on KOAc/NaY Catalyst

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.