Preparation and purifying method of 2, 3, 4, 5-tetrachloronitrobenzene

The invention discloses a preparation and purifying method of 2, 3, 4, 5-tetrachloronitrobenzene. The preparation and purifying method comprises the steps as follows: using 2, 4, 5-trichloronitrobenzene as raw material, concentrated sulfuric acid and chlorosulfonic acid as solvents, 1, 2-dichloroeth...

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Hauptverfasser: ZHOU KUNYING, WEI XINGHUI, YANG LINRONG, ZHENG ZHOU, YANG JIANPING
Format: Patent
Sprache:chi ; eng
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Zusammenfassung:The invention discloses a preparation and purifying method of 2, 3, 4, 5-tetrachloronitrobenzene. The preparation and purifying method comprises the steps as follows: using 2, 4, 5-trichloronitrobenzene as raw material, concentrated sulfuric acid and chlorosulfonic acid as solvents, 1, 2-dichloroethane as cosolvent and iodine as catalyst; carrying out chlorination to 2, 4, 5-trichloronitrobenzene and chlorine at reaction temperature of 50 to 80 DEG C; and then separating, purifying and crystallizing to obtain 2, 3, 4, 5-tetrachloronitrobenzene. The product disclosed by the invention is high in yield and purity, and mild in reaction condition; and the used solvent mixed acid, catalyst, cosolvent, 1, 2-dichloroethane and recrystallization solvent ethanol can be used indiscriminately, so that the cost of the raw material can be reduced; and the preparation and purifying method is mild in the reaction condition, and lower in environmental pollution, and is suitable for industrial production.