Production method

1, m-phenylenediamine acylation method obtained by m-phenylenediamine acylation. Add water and m-phenylenediamine to the reaction pot to dissolve. Then add 30% hydrochloric acid, stir for half an hour, then add acetic acid, control the reaction temperature at 40℃, keep warm and stir for 1h, add refined salt to salt-out, filter. It was neutralized to obtain m-amino-acetanilide. Acetic anhydride may also be used as a feedstock for acylation. Raw material consumption quota of M-phenylenediamine 1021kg/t, acetic anhydride 1013kg/t, hydrochloric acid 475kg/t.

2. For m-nitroacetanilide method, 10g m-nitroacetanilide and 5g iron powder are evenly mixed in a mortar, and then scattered into a 500ml beaker containing 200ml boiling water, with a few drops of acetic acid acidification mixture, and kept warm for 1h. Then, add ammonia water to neutralize until the fruit red test paper is alkaline. Boil, strain while hot, and evaporate the filtrate over a water bath until it forms a paste. The wall of the frictor or the seed is put into the slurry to crystallize, and the product close to the theoretical amount can be obtained, and the melting point is 87~89℃.

use

Dye intermediates. It is mainly used to prepare reactive dyes such as reactive yellow K-RN and disperse dyes.