Patent ID: 6359177
Filing Date: 2002-03-19
Classification: C07C

Abstract:
A process for separating a mixture of materials having different boiling points comprisinga) distilling the mixture to separate it into (1) a low boiling fraction, (2) an intermediate fraction having a boiling point between that of the low boiling fraction (1) and a high boiling fraction, and (3) a high boiling fraction, b) feeding the high boiling fraction to a stripping column, c) stripping the high boiling fraction in the stripping column with the vapors of a portion of the low boiling fraction, d) recovering a mixture composed of a portion of the low boiling fraction and a portion of the high boiling fraction in which substantially no intermediate fraction is present as a bottoms product from the stripping column, e) recovering a mixture composed of a portion of the low boiling fraction and a portion of the intermediate fraction as a distillate from the stripping column, and f) recycling the mixture recovered in step e) to step a).