Method and plant for producing ethylene

US11130722B2 · kind B2 · utility

Assignee

• Linde GmbH · DE

Inventors

• Helmut Fritz · Munich, DE
• Andreas Obermeier · Birkenfeld, DE
• Andreas Peschel · Wolfratshausen, DE
• Tuat Pham Duc · Penzberg, DE
• Desislava Tota · Munich, DE

Key dates

• Filing date: Sep 13, 2018
• Grant date: Sep 28, 2021
• Expiry date: Sep 13, 2038

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P20/52
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Proposed is a process for producing ethylene wherein using a dehydrogenation of ethane a process gas containing at least ethane, ethylene and compounds having a lower boiling point than ethane and ethylene is formed, wherein using at least a part of the process gas a separation input is formed and subjected to a low-temperature separation (6) in which the separation input is cooled and in which one or more condensates are separated from the separation input, wherein the condensate(s) are at least partly subjected to a low-temperature rectification to obtain a gaseous first fraction and a liquid second fraction, wherein the gaseous first fraction contains at least the ethane and the ethylene in a lower proportion than in the separation input and the compounds having a lower boiling point than ethane and ethylene in a higher proportion than in the separation input. It is provided that the first fraction is at least partly subjected to a pressure swing adsorption (7) by means of which a third fraction containing predominantly or exclusively ethylene and ethane and a fourth fraction containing predominantly or exclusively methane and carbon monoxide are formed. A corresponding plant (1…