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...
Gespeichert in:
Hauptverfasser: | , , , , |
---|---|
Format: | Patent |
Sprache: | chi ; eng |
Schlagworte: | |
Online-Zugang: | Volltext bestellen |
Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
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. |
---|