Guangzhou Chenghao Trading Co., Ltd.

By water fever (acetanilide) generated by the mixed acid nitration of nitro acetanilide, then use iron powder reduction for amino acetanilide, reaction liquid by neutralization, crystallization, drying in finished products.

1. The nitrification Within the kettle to join sulfuric acid (98%) of 675 kg, stirring, 20 -- 25  in 2-2.5 h to join acetanilide (99%) of 225 kg, and never put off till tomorrow what you can, make its soluble. Cooled to 7  in 4-7 , about 20 h and mixed acid (by 63 kg of water, 60 kg98 kg96 % % sulphuric acid and 107 with the nitrate). Add finish, dilution in 4000 l of ice water, let stand for 1 h. Upper siphon waste acid separation, the lower filter materials, washed to neutral, the nitro acetanilide.

2. Reduction in reduction in the barrel 700 kg of water, stir and add 110 kg of iron powder and acetic acid (98%), 4 kg, up to 80 , 2-2.5 kg in add half the nitro-group compounds, the temperature control in 72-75 . Never put off till tomorrow what you can, heat 1 h and let stand for 1 h. The upper material liquid inhalation and kettle, in 70-75 , soda ash (about 4 kg) and to pH = 8, and add a small amount of alcali sulphide removal of iron ions. Let stand for 1 h, the supernatant fluid inhalation scraper crystallizer, cold to 18 . Amino acetanilide centrifugal filtration, drying, to about 200 kg, the total yield of 80%. Production of amino acetanilide from paranitroaniline, mix it with acetic acid and acetic anhydride beaten, 4-5 h, heating water filter out crystallization, washing, filtering; Then washed the nitro acetanilide add water, iron powder and acetic acid, mixing heat preservation 4 h, decoloring, filter to remove iron oxide, filtrate cold crystallization precipitation, filtration, recrystallization with ethanol and quick finished product. Raw material consumption quota: acetanilide (98%) of 1210 kg/t, sulfuric acid, nitric acid (98%) of 4000 kg/t (95%), 577 kg/t.