US EPA

8309471 

Journal Article 

Synthesis technology of m-phenylenediamine by catalytic hydrogenation over nickel-based catalyst in trickle-bed reactor 

Zhao, L; Chen, J; Zhang, J 

2005 

Chk 

Huaxue Fanying Gongcheng yu Gongyi / Chemical Reactive Engineering and Technology
ISSN: 1001-7631 

21 

5 

392-396 

Chinese 

The catalytic hydrogenation of m-dinitrobenzene (MDNB) to m-phenylenediamine (MPD) was tested over Ni/La2O3-SiO2 catalyst in a trickle-bed reactor. Effects of the reaction conditions, such as temperature, pressure, space velocity of hydrogen and MDNB and kinds of solvents on the reactivity of the catalyst were systematically investigated. It was found that there existed higher MDNB conversion and MPD selectivity in a proper temperature range. Lower temperature was unfavorable to MPD selectivity, and MPDB conversion decreased at higher temperature. With the increase of pressure and GHSV of H2, the conversion of MDNB and the selectivity of MPD both enhanced. There existed higher catalytic performance of the catalyst with ethylacetate as the solvent due to a better dissolution of MDNB in ethylacetate than in ethanol. With ethylacetate as solvent, the conversion of MDNB and the selectivity of MPD both exceeded 99. 5% under the optimal reaction conditions confirmed by the experiment. 

Catalytic hydrogenation; M-dinitrobenzene; M-phenylenediamine; Ni-based catalyst; Trickle-bed reactor