Verfahren zur Reinigung einer Bromverbindung

摘要

A method for purifying a bromine compound of formula (1): in which Ar<1> and Ar<2> are each independently a C6-10 aromatic hydrocarbon group; Y is a C1-2 alkylene group, a single bond, sulfone group or ketone group; R<1> and R<2> are each independently a C2-5 hydrocarbon group; m and n are each independently an integer of 1 to 4; p and q are each independently 2 or 4; by depositing the bromine compound as solid particles from a crude solution containing the bromine compound wherein (i) the crude solution is supplied into a slurry containing the particles of the bromine compound; (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 the bromine compound and the solubility of the bromine compound in the mixed solvent is maintained at 0.1 to 5 g/100 g of solvent; and (iv) the solid particles of the bromine compound are separated from the slurry.