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发明公开
CN102199072A 对二甲苯直接催化羟基化制备2,5-二甲基苯酚的方法 无效 - 撤回

对二甲苯直接催化羟基化制备2,5-二甲基苯酚的方法
摘要：
本发明提出了一种对二甲苯直接催化羟基化制备2，5-二甲基苯酚的方法。以乙腈为溶剂，H2O2为羟基化试剂，C.I.颜料绿8为催化剂，将对二甲苯一步催化羟基化为2，5-二甲基苯酚，催化羟基化反应时间：4小时-7小时，催化羟基化反应温度：40℃-70℃；反应物料配比为H2O2∶乙腈∶C.I.颜料绿8∶对二甲苯的质量比为6～9∶15～30∶0.05～0.2∶1。本发明催化剂容易得到、反应步骤少、H2O2可以充分利用、溶剂可回收、三废排放量少；催化羟基化操作工艺容易实施。
摘要（英）：

The invention provides a method for preparing 2,5-dimethyl phenol through the direct catalytic hydroxylation of p-xylene. In the method, acetonitrile is taken as a solvent, H2O2 is taken as a hydroxylation reagent, C.I. pigment green 8 is taken as a catalyst, the p-xylene is subjected to one-step catalytic hydroxylation at the temperature of between 40 and 70 DEG C for 4 to 7 hours to form the 2,5-dimethyl phenol, and the mass ratio of reaction materials, namely the H2O2 to the acetonitrile to the C.I. pigment green 8 to the p-xylene is (6-9):(15-30):(0.05-0.2):1. The catalyst is readily available, a few reaction steps are performed, the H2O2 can be fully utilized, the solvent can be recycled, and a few three wastes (waste water, waste gas and waste residues) are generated; and the catalytic hydroxylation operation process is easy to implement.

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