COPRODUCTION OF A NORMAL PURITY AND ULTRA HIGH PURITY VOLATILE COMPONENT FROM A MULTI-COMPONENT STREAM

摘要

This invention relates to an improved process for the coproduction of a volatile component with normal purity and ultra high purity from a stream containing other heavier components and contaminated with lighter impurities which are more volatile than the volatile component. The improvement resides in removing a stream of the volatile component which is substantially free of the lighter impurities and then introducing the stream stripped of impurities to a second distillation column for fractionation. The second distillation column is equipped with a rectification section wherein the stream is rectified and the volatile component obtained in ultra high purity as an overhead. The volatile component with normal purity is obtained from the first distillation column as an overhead.