摘要 |
<p>Methods for purifying a p,p-bisphenol A generally include distilling a feed stream comprising p,p-BPA in a distillation column at a pressure less than or equal to 20 millibars. The distillation column separates the bisphenol feed stream to produce a light fraction, an intermediate fraction and a heavy fraction. The intermediate fraction comprising the purified bisphenol contains lesser impurities that the p,p-BPA in the feed stream. In one embodiment, the intermediate stream is recovered using a sidedraw. The side-draw is located between a first zone and a third zone in the distillation column.</p> |
申请人 |
GENERAL ELECTRIC COMPANY;KUMAR, RAMACHANDRAN;RAVI, GOMATAM, RAGHAVAN;BASTIAN, HYACINTH, MARY;SATHYANARAYANA, GURURAJ;SHAFER, SHELDON, JAY;RAMAMURTHY, KUMAR, KRISHNA;MURUKUTLA, DWIJARAJA, MOULI;RAMANARAYANAN, G.V. |
发明人 |
KUMAR, RAMACHANDRAN;RAVI, GOMATAM, RAGHAVAN;BASTIAN, HYACINTH, MARY;SATHYANARAYANA, GURURAJ;SHAFER, SHELDON, JAY;RAMAMURTHY, KUMAR, KRISHNA;MURUKUTLA, DWIJARAJA, MOULI;RAMANARAYANAN, G.V. |