A PROCESS OF FRACTIONAL SEPARATION OF SUBSTANCES OF DIFFERING VOLATILITY.

摘要

We claim : 1. A process of fractional separation of substances of differing volatility which comprises passing a feed composed of a mixture of the materials to be separated through a rectification zone at a temperature at which vaporization of at least some of the more volatile constituents takes place and contact between vapor and liquid is maintained until substantial equilibrium is reached, condensing at least a portion of the vapor and returning it to the rectification zone as reflux, transferring liquid from the rectification zone to a stripping zone having at least one stage, removing liquid from the stripping zone enriched in high boiling constituent of the mixture to be separated, rebelling a portion and passing the vapors up through stripping and rectification zones, maintaining a variable reflux, increasing down through the rectification zone to a maximum at feed inlet and then decreasing through the stripping zone, whereby the system operates at variable molal liquid overflow and excess beat is produced in rectification zones over that in stripping zones and transferring by indirect heat exchange the heat from rectification zones to corresponding stripping zones.