Method for preparing isopropylbenzene by coupling dimethyl benzyl alcohol reaction rectification with hydrogenation reaction

The invention discloses a method for preparing isopropylbenzene by coupling dimethyl benzyl alcohol reaction rectification with hydrogenation reaction. In the reactive distillation tower, the isopropylbenzene-containing dimethyl benzyl alcohol stream without heavy components enters a reactive distillation section filled with an acid catalyst, dimethyl benzyl alcohol is dehydrated to generate AMS and water, the AMS, the water and the isopropylbenzene are rectified and separated to the tower top to be extracted, and the water is separated, the isopropylbenzene-containing dimethyl benzyl alcoholstream passes through a hydrogenation reactor to be hydrogenated to generate isopropylbenzene. According to the process, the defects of poor selectivity, poor stability, short service life, high costand the like of the current catalyst for the direct hydrogenolysis reaction of dimethyl benzyl alcohol are overcome, and meanwhile, the material consumption and energy consumption in the separation process are reduced. 本发明公开一种