Catalyst preparation for continuous synthesis of N-(1-ethylpropyl)-3,4-dimethylaniline and its catalytic preformance
In this paper,3,4-dimethylnitrobenzene,3-pentanone and hydrogen were used as raw materials to continuously carry out hydrogenation and alkylation reaction in self-made automatic fixed bed reactor,and a new process for continuous production of N-(1-ethylpropyl)-3,4-dimethylaniline was explored.The effects of Sn modification and active component platinum precursor on catalyst performance were systemat-ically investigated.The effects of reaction conditions on the conversion of raw materials and the selectivity of products were also investigated.Studies have shown that Sn doping modification and the use of potassium chloroplatinate as the precursor of active component can increase the activity and stability of PtSn/C catalyst.The conversion of 3,4-dimethylnitrobenzene and selectivity of N-(1-ethylpropyl)-3,4-dimethyl-aniline were the highest when the reaction temperature was 70 ℃,the reaction pressure was 1.5 MPa and the molar ratio of hydrogen to material was 10.The product yield was stable above 99％after continuous operation for 50 days.This study provided technical support for the application of green herbicide dime-pentaline.
fine chemical engineereingN-(1-ethylpropyl)-3,4-dimethylaniline3,4-dimethylnitro-benzenecatalytic hydrogenationplatinum-tin carbon
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