TNU-9 zeolite catalyzed direct hydration of cyclohexene preparation of cyclohexanol
|School||Harbin Institute of Technology|
|Keywords||Cyclohexene Cyclohexanol TNU-9 HZSM-5|
Cyclohexanol is an important chemical raw material, its synthesis and technology research has been widespread concern . Among them, the direct hydration of cyclohexene preparation of cyclohexanol with fewer reaction steps , the raw material is easy to obtain, equipment requirements and low , so to carry out hydration of cyclohexene to cyclohexanol was prepared for the industrial preparation of cyclohexanol significance . The main contents of this paper is based on 1,4-MPB TNU-9 was synthesized molecular sieve catalyst , and its characterization , and then in the TNU-9 catalyst catalyzed direct hydration of cyclohexene preparation of cyclohexanol, examine a variety of factors cyclohexene hydration effects , optimize cyclohexene hydration process , preliminary exploration of the catalyst cyclohexene hydration reaction kinetics . First, acetone , N-methyl pyrrolidine , 1,4- dibromobutane was synthesized from 1,4-MPB, by IR, XRD its crystal structure characterization . Synthesis of 1,4-MPB then hydrothermally prepared TNU-9 zeolite catalyst powder XRD, SEM, elemental analysis and BET surface area analysis of its structural characterization . Secondly, the study TNU-9 zeolite catalyzed direct hydration of cyclohexene process , to get a better reaction conditions: reaction time 4 h, reaction temperature 140 ~ 150 ℃, catalyst was 0.054 g / mL, en- water ratio of 2:5 . In this case, conversion of cyclohexene was 9.5 %, a selectivity of 95.0% hexanol , cyclohexanol, 9.03% yield . Also studied the HZSM-5 zeolite catalyst cyclohexene hydration process directly to obtain optimum reaction conditions were: reaction time was 4 h, the reaction temperature 130 ~ 140 ℃, the amount of catalyst 0.036 g / mL, en- water ratio 2:5 . In this case, conversion of cyclohexene was 9.3 %, a selectivity of 98.0% hexanol , cyclohexanol, 9.18% yield . Finally , through the cyclohexene hydration reaction kinetics analysis , the establishment of TNU-9 zeolite catalytic cyclohexene hydration reaction kinetic model . Experimental data, a good correlation with the theoretical value , indicating that cyclohexene hydration reaction kinetic model is more reasonable.