公开(公告)号：US07371902B2

公开(公告)日：2008-05-13

申请号：US10953132

申请日：2004-09-29

申请人： Ramachandran Kumar ,  Gomatam Raghavan Ravi ,  Hyacinth Mary Bastian ,  Gururaj Sathyanarayana ,  Sheldon Jay Shafer ,  Kumar Krishna Ramamurthy ,  Dwijaraja Mouli Murukutla ,  Venkata Rama Narayanan Ganapathy Bhotla

发明人： Ramachandran Kumar ,  Gomatam Raghavan Ravi ,  Hyacinth Mary Bastian ,  Gururaj Sathyanarayana ,  Sheldon Jay Shafer ,  Kumar Krishna Ramamurthy ,  Dwijaraja Mouli Murukutla ,  Venkata Rama Narayanan Ganapathy Bhotla

IPC分类号： C07C37/68 ,  C07C39/12 ,  C07C39/16

CPC分类号： C07C37/74 ,  C07C39/16

摘要： 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 side-draw. The side-draw is located between a first zone and a third zone in the distillation column.

摘要翻译： 纯化p，p-双酚A的方法通常包括在压力小于或等于20毫巴的蒸馏塔中蒸馏包含p，p-BPA的进料流。 蒸馏塔分离双酚进料流以产生轻馏分，中间馏分和重馏分。 包含纯化双酚的中间馏分含有较少的杂质，即进料流中的p，p-BPA。 在一个实施方案中，使用侧馏分回收中间物流。 侧馏分位于蒸馏塔中的第一区和第三区之间。