Method for recycling 4, 4-dinitrodiphenyl ether by-product

The invention provides a 4, 4-dinitrodiphenyl ether byproduct recovery treatment method, and belongs to the technical field of organic synthesis. According to the method, the pH value is adjusted to 3-4 to remove substances capable of reacting with acid in the byproduct salt, the ferrous sulfate and the first activated carbon are used for decoloring and removing the color of the 4, 4-dinitrodiphenyl ether material, then the pH value is adjusted to 6-8 to remove the ferrous sulfate, and then secondary decoloring is performed, so that the obtained solid salt is white; the hydrogen peroxide is used for removing organic matters in the reaction, the resin column elution ensures that the parachloronitrobenzene, the sodium p-nitrophenolate and the DNP organic matters are completely removed, finally, the solid salt with the sodium chloride content being greater than or equal to 99.1 g/100g and the TOC (total organic carbon) being less than 50mg/Kg is obtained, the obtained solid salt does not have the smell of p-nitr