苯酚甲醇气相烷基化合成2,6-二甲酚

Synthesis of 2,6-xylenol from Phenol and Methanol via Gas Phase Alkylation

采用共沉淀法制备了Fe系复合催化剂,考察了该催化剂对苯酚-甲醇气相烷基化合成2,6-二甲酚的催化性能。实验结果表明,在0.2MPa、反应温度340℃,液态空速0.5 h-1,苯酚∶甲醇∶水=1∶5∶0.5(mol/mol)的反应条件下,苯酚单程转化率达99%,2,6-二甲酚选择性85%以上,邻位总选择性在98%以上。催化剂制备简单,再生容易,重复性好。

The Fe-catalyst was prepared through co-precipitation method and used in synthesis of 2,6-xylenol from pehenol and methanol via gas phase alkylation. It was shown that catalyst was excellent to synthesis of 2,6-xylenol. When n（phenol）：n（methanol）：n（H20）=1：5：0.5, the conversion of phenol reached 99 %, selectivity to 2,6-xylenol was over 85 % and all selectivity of ortho was over 98 % under the conditions of reaction temperature 340 ~C, LHSV 0.5 h-1, pressure 0.2 MPa. The catalyst with good repeatability could be regenerated easily o