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在乙酸存在和空气气氛下,以磷酸铁为催化剂进行了对甲酚气相选择氧化生成对羟基苯甲醛和对羟基苯甲醇的反应.考察了不同乙酸/对甲酚比和反应温度对反应产物分布的影响.结果表明,加入乙酸可抑制目标产物深度氧化,促进气相反应中高选择性地生成对羟基苯甲醛和对羟基苯甲醇.在反应温度为250℃,乙酸/对甲酚比为0.9,催化剂用量为0.35g和对甲酚流速为1.92g/h时,生成对羟基苯甲醛的选择性为34.4%,生成对羟基苯甲醇的选择性为65.6%.
The reaction of p-cresol selective oxidation of p-cresol to p-hydroxybenzaldehyde and p-hydroxybenzyl alcohol was carried out in the presence of acetic acid under air atmosphere using iron phosphate as catalyst.The effects of different acetic acid / p-cresol ratio and reaction temperature on the reaction product distribution .The results showed that the addition of acetic acid could inhibit the deep oxidation of the target product and promote the high selectivity of p-hydroxybenzaldehyde and p-hydroxybenzyl alcohol in the gas phase reaction.When the reaction temperature was 250 ℃, the ratio of acetic acid / p-cresol was 0.9, At 0.35 g and para-cresol flow rates of 1.92 g / h, the selectivity to p-hydroxybenzaldehyde was 34.4% and the selectivity to p-hydroxybenzyl alcohol was 65.6%.