A method for highly selective preparation of 3,4-dichloroaniline
A technology of dichloroaniline and dichloronitrobenzene, which is applied in the field of high-selectivity catalytic hydrogenation preparation 3, can solve the problems of less times of catalyst application and high cost, and achieve the effect of solvent recovery, low cost and high selectivity
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Embodiment 1
[0025] Add 64 g of 3,4-dichloronitrobenzene and 0.16 g of 3% Pt (water content 59.98%) catalyst containing additives into a stainless steel autoclave, seal the autoclave, replace the air in the autoclave with nitrogen three times, and then Replace the nitrogen in the kettle with hydrogen three times and maintain a certain pressure in the kettle. Heat up to 85°C under stirring, maintain the reaction pressure at 1.75MPa, close the hydrogen valve after the reaction is over, let the gas out, open the autoclave to discharge, keep warm at about 75°C to filter out the catalyst, and use gas chromatography to analyze the reduction product, 3,4-dichloronitro The conversion rate of benzene is 100%, the selectivity of 3,4-dichloroaniline is 99.6%, and the dechlorination rate is 0.19%.
Embodiment 2
[0027] The catalyst was changed, and the effect of the Pt catalyst without promoters on the hydrogenation of 3,4-dichloronitrobenzene was investigated.
[0028] Add 64g of 3,4-dichloronitrobenzene and 0.16g of 3%Pt (water content 59.78%) catalyst into a stainless steel autoclave, seal the autoclave, replace the air in the autoclave with nitrogen three times, and then replace the autoclave with hydrogen Inner nitrogen three times and maintain a certain pressure in the kettle. Heat up to 85°C under stirring, maintain the reaction pressure at 1.75MPa, close the hydrogen valve after the reaction is over, let the gas out, open the autoclave to discharge, keep warm at about 75°C to filter out the catalyst, and use gas chromatography to analyze the reduction product, 3,4-dichloronitro The conversion rate of benzene is 100%, the selectivity of 3,4-dichloroaniline is 99.0%, and the dechlorination rate is 0.27%.
Embodiment 3
[0030] Increase the amount of catalyst to investigate the effect of catalyst amount on the hydrogenation of 3,4-dichloronitrobenzene.
[0031] Add 64 g of 3,4-dichloronitrobenzene and 0.18 g of 3% Pt (water content 59.98%) catalyst containing additives into a stainless steel autoclave, seal the autoclave, replace the air in the autoclave with nitrogen three times, and then Replace the nitrogen in the kettle with hydrogen three times and maintain a certain pressure in the kettle. Heat up to 85°C under stirring, maintain the reaction pressure at 1.75MPa, close the hydrogen valve after the reaction is over, let the gas out, open the autoclave to discharge, keep warm at about 75°C to filter out the catalyst, and use gas chromatography to analyze the reduction product, 3,4-dichloronitro The conversion rate of benzene is 100%, the selectivity of 3,4-dichloroaniline is 99.5%, and the dechlorination rate is 0.20%.
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