| US 7,541,417 B2 | ||
| Process for the purification of dihydric phenols | ||
| Sunil Ashtekar, Karnataka (India); Mahesh Malusare, Karnataka (India); Gurram Kishan, Karnataka (India); Pushpa Narayanan, Karnataka (India); Ramanarayanan GV, Karnataka (India); Arun Dixit, Karnataka (India); Pradeep Nadkarni, Karnataka (India); and Jan Plen Lens, Breda (Netherlands) | ||
| Assigned to SABIC Innovative Plastics IP B.V., Bergen op Zoom (Netherlands) | ||
| Filed on Mar. 30, 2006, as Appl. No. 11/277,957. | ||
| Prior Publication US 2007/0232775 A1, Oct. 04, 2007 | ||
| Int. Cl. C08G 64/00 (2006.01); C08G 63/00 (2006.01) | ||
| U.S. Cl. 528—196 [528/176; 528/190; 528/193; 562/485; 562/486; 562/600; 568/637; 568/749; 568/750] | 22 Claims |
| 1. 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.
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