Process and plant for producing an olefin

US10730810B2 · kind B2 · utility

Assignee

• Linde GmbH · DE

Inventors

• Andreas Peschel · Wolfratshausen, DE
• Andreas Obermeier · Birkenfeld, DE
• Helmut Fritz · Munich, DE
• Mathieu Zellhuber · Martinsried, DE

Key dates

• Filing date: Dec 22, 2017
• Grant date: Aug 4, 2020
• Expiry date: Dec 22, 2037

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F25J2270/60
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A process for producing an olefin having N carbon atoms is proposed in which using a dehydrogenation a process gas is formed which contains at least the olefin having N carbon atoms, a paraffin having N carbon atoms and a hydrocarbon having N−1 carbon atoms and in which using at least a portion of the process gas a separation input is formed which is subjected to a low temperature separation in which the separation input is cooled stepwise over a plurality of temperature levels and condensates are separated from the separation input, wherein the condensates are at least partly subjected to a first low temperature rectification to obtain a first gas fraction and a first liquid fraction, wherein the first gas fraction contains at least the olefin having N carbon atoms in a lower proportion than in the condensates and the hydrocarbon having N−1 in a higher proportion than in the condensates. It is provided that the first gas fraction is at least partly subjected to a second low temperature rectification using a liquid reflux containing predominantly or exclusively the hydrocarbon having N−1 carbon atoms in which the first gas fraction undergoes depletion in the olefin having N carbon …