Method for purifying a bromine compound

A method for purifying a bromine compound by depositing the bromine compound represented by the following general formula (1) as solid particles from a crude solution containing the bromine compound:

• wherein Ar1 and Ar2 are the same or different and each an aromatic hydrocarbon group having 6 to 10 carbon atoms;
• Y is a methylene group or isopropylidene group;
• R1 and R2 are an alkyl group having 2 or 3 atoms;
• m and n are 1 or 2;
• and p and q are 2, wherein
• (i) the crude solution is supplied into the slurry containing the particles of the bromine compound to deposit the bromine compound in the slurry under agitation;
• (ii) the concentration of the particles of the bromine compound in the slurry is maintained at 10 to 50 wt %;
• (iii) the solvent contained in the slurry is a mixed solvent of a good solvent and a poor solvent for a bromine compound, the weight ratio of the good solvent to the poor solvent in the slurry is 30:70 to 60:40 and the solubility of the bromine compound in the mixed solvent is maintained at 0.1 to 5 g/100 g of the solvent;
• and
• (iv) the slurry is extracted to separate the solid particles of the bromine compound from the slurry.

A method for continuously purifying a bromine compound to obtain a bromine compound having an average particle diameter of 0.1 to 0.9 mm by depositing the bromine compound represented by the following general formula (1) as solid particles from a crude solution containing the bromine compound:

• wherein Ar1 and Ar2 are the same or different and each an aromatic hydrocarbon group having 6 to 10 carbon atoms;
• Y is a methylene group or isopropylidene group;
• R1 and R2 are an alkyl group having 2 or 3 atoms;
• m and n are 1 or 2;
• and p and q are 2, wherein
• (i) the crude solution and a poor solvent for the bromine compound are continuously supplied into a vessel containing the slurry that contains the particle of the bromine compound to deposit the bromine compound in the slurry under agitation;
• (ii) the concentration of the particles of the bromine compound in the slurry is maintained at 10 to 50 wt %;
• (iii) the solvent in the slurry contained in the vessel is a mixed solvent of a good solvent and a poor solvent for the bromine compound, the weight ratio of the good solvent to the poor solvent in the slurry is 30:70 to 60:40 and the solubility of the bromine compound in the mixed solvent is maintained at 0.1 to 5 g/100 g of the solvent;
• and
• (iv) the slurry is continuously extracted from the vessel and the solid particles of the bromine compound are separated from the slurry.