Distillation process and multi-column heat-integrated distillation system

摘要

A distillation system and process for separating a multi-component feed mixture in a distillation system comprising a first distillation column having a first fired reboiler, and at least a second distillation column having a second heat-exchange reboiler, comprising the steps of a) introducing the feed mixture to the first column, and separating into at least a first top and a first bottom product; b) taking part of the first bottom product for providing heat to the second reboiler as a utility stream; and c) feeding part of said utility stream after heat-exchange as main feed to the second column for further separation. This process allows significant energy savings, by reduction of the amount of external heat required for the fired reboiler and omission of a conventionally used heat-exchanger.

主权项

1. A process for separating a multi-component feed mixture in a distillation system comprising a first distillation column having a first fired reboiler, and a second distillation column having a second heat-exchange reboiler, comprising:
a) introducing the feed mixture to the first distillation column, and separating into at least a first top and a first bottom product; b) taking part of the first bottom product for providing heat to the second heat exchange reboiler as a utility stream; c) feeding part of said utility stream after heat-exchange as main feed to the second distillation column for further separation, wherein temperature and pressure of said part of said utility stream are adiabatically adjusted before feeding to the second column.