Patent ID: 7541417

Claim:
A method for purifying a dihydric phenol, the method comprising: dissolving a dihydric phenol having Formula (I) wherein R is a hydrogen atom or an aliphatic functionality having 1 to 6 carbon atoms; and n is an integer having a value of 1 to 4, in a solvent to form a solution A; contacting the solution A with an adsorbent material selected from the group consisting of metal oxides, modified metal oxides, activated carbons, and clays, wherein the step of contacting is carried out at a temperature of about 25° C. to about 120° C; filtering the adsorbent material to form a solution B; adding an anti-solvent to the solution B to form a solution C, wherein the anti-solvent has a higher boiling point than the solvent; and distilling the solution C until about 10 to 80% of the original weight of the solvent is removed.