CAJ | 학술논문

在常压H_2气氛下催化丙三醇脱水-加氧制备了1,2-丙二醇.首先在220℃和常压H_2条件下,以Cu/Al_2O_3为催化剂催化丙三醇脱水生成中间体内酮醇,其选择性高达86%.考察了Cu负载量、反应温度和反应气氛对催化剂件能的影响.在随后的丙酮醇加氢反应中,Raney Ni催化剂显示出优异的催化性能,在120℃和常压H_2条件下,1,2-丙二醇选择性可达99%以上,催化剂连续使用5h未出现失活现象.考察了反应温度、空速及反应时间对催化剂性能的影响.
재상압H_2기분하최화병삼순탈수-가양제비료1,2-병이순.수선재220℃화상압H_2조건하,이Cu/Al_2O_3위최화제최화병삼순탈수생성중간체내동순,기선택성고체86%.고찰료Cu부재량、반응온도화반응기분대최화제건능적영향.재수후적병동순가경반응중,Raney Ni최화제현시출우이적최화성능,재120℃화상압H_2조건하,1,2-병이순선택성가체99%이상,최화제련속사용5h미출현실활현상.고찰료반응온도、공속급반응시간대최화제성능적영향.
The novel technology for synthesis of 1,2-propylene glycol by dehydration-hydrogenation of glycerol at ambient hydrogen pres-sure was reported. Dehydration of glycerol to acetol was catalyzed by Cu/Al_2O_3 catalyst. A 86% selectivity for acetol was achieved at 220 ℃ and ambient hydrogen pressure. The effects of copper loading, reaction temperature, and reaction atmosphere on the catalyst performance were studied. Raney Ni catalyst showed excellent catalytic performance in the hydrogenation of acetol to 1,2-propylene glycol. The selectiv-ity for 1,2-propylene glycol was more than 99% at 120 ℃ and ambient hydrogen pressure, and no appreciable change in the activity was observed over the Raney Ni catalyst after 5 h of time-on-stream. The influence of reaction conditions on the conversion and selectivity was also investigated in the hydrogenation of acetol.