Process and plant for the recovery and utilization of higher olefins in the olefin synthesis from oxygenates

US10202554B2 · kind B2 · utility

Assignee

• L'Air Liquide, Societe Anonyme Pour l'Etude et l'Exploitation des Procedes Georges Claude · FR

Inventors

• Ingo Bauer · Bad Vilbel, DE
• Martin Rothaemel · Frankfurt am Main, DE

Key dates

• Filing date: Jun 10, 2016
• Grant date: Feb 12, 2019
• Expiry date: Jun 10, 2036

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P30/20
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process and a plant for producing olefins from oxygenates such as methanol and/or dimethyl ether are proposed, in which initially the oxygenates are converted to a primary product containing propylene, other olefins, paraffins and aromatics in an olefin synthesis reactor. The primary product is separated into hydrocarbon fractions of different C chain length, wherein short-chain olefins such as propylene are obtained and beside further fractions there is also obtained a C7− fraction which contains C5/C6 olefins, as well as a C7+ fraction which contains aromatics. From the latter, the aromatics are separated and alkylated with the C5/C6 olefins to obtain alkyl aromatics. The same are hydrogenated completely and recirculated to the olefin synthesis reactor, where they likewise are converted to short-chain olefins.