| US 7,528,210 B2 | ||
| Method of purification of dihydric phenols | ||
| Guohua Xiu, Shanghai (China); Tong Sun, Pudong (China); Jan Plen Lens, Breda (Netherlands); Sunil Ashtekar, Karnataka (India); Mahesh Malusare, Karnataka (India); Gurram Kishan, Karnataka (India); and Pushpa Narayanan, Karnataka (India) | ||
| Assigned to SABIC Innovative Plastics IP B.V., Bergen op Zoom (Netherlands) | ||
| Filed on Mar. 30, 2006, as Appl. No. 11/277,956. | ||
| Prior Publication US 2007/0232774 A1, Oct. 04, 2007 | ||
| This patent is subject to a terminal disclaimer. | ||
| Int. Cl. C08G 63/00 (2006.01); C08G 63/02 (2006.01) | ||
| U.S. Cl. 528—176 [528/190; 528/193; 562/485; 562/486; 562/600; 568/637; 568/749; 568/750] | 19 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 a zeolite wherein the step of contacting of the dihydric phenol in the solvent is carried out
at a temperature of about 25° C. to about 120° C.;
filtering the zeolite 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.
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