Patent ID: 6960698

Claim:
A method for treating tar, which comprises the following steps of: (1) oxidizing a liquid containing diisopropylbenzene with air or oxygen in a liquid phase, to convert it into a liquid containing di-(2-hydroperoxy-2-propyl)benzene; (2) contacting the liquid containing di-(2-hydroperoxy-2-propyl)benzene with an alkaline aqueous solution to obtain an aqueous layer containing di-(2-hydroperoxy-2-propyl)benzene and an oil layer; (3) contacting the aqueous layer containing a di-(2-hydroperoxy-2-propyl)benzene with an organic solvent as an extracting solvent, to obtain an aqueous layer and an oil layer containing a di-(2-hydroperoxy-2-propyl)benzene extracted from the aqueous layer; (4) contacting the oil layer thus obtained with an acid to obtain a liquid containing a dihydroxybenzene via acidolysis of the di-(2-hydroperoxy-2-propyl)benzene; (5) distilling the liquid containing the dihydroxybenzene to separate tar from a low boiling point component containing the organic solvent and the dihydroxybenzene; and (6) mixing the tar with an alkaline aqueous solution to dissolve the tar in the alkaline aqueous solution.