Plant and process for producing propylene from methanol

US10035737B2 · kind B2 · utility

Assignee

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

Inventors

• Frank Castillo-Welter · Friedrichsdorf, DE
• Stephane Haag · Frankfurt am Main, DE
• Lin Lin · Chicago, US
• Martin Rothamel · Frankfurt, DE

Key dates

• Filing date: Dec 15, 2015
• Grant date: Jul 31, 2018
• Expiry date: Dec 15, 2035

Classification

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

Abstract

The present invention relates to a plant and a process for producing propylene at least one oxygenate, comprising a reactor for converting the reactant mixture into a product mixture which comprises propylene and also aliphatic and aromatic C5+ hydrocarbons, at least one distillation column for removing a C5+ stream, the C5+ stream comprising at least 90 wt % of the aliphatic and aromatic C5+ hydrocarbons of the product mixture, an extractive distillation column for separating the C5+ stream into an aromatics stream and an aliphatics stream, the aliphatics stream comprising at least 90 wt % of the aliphatics of the C5+ stream, and the aromatics stream comprising at least 90 wt % of the aromatics of the C5+ stream, and an aliphatics recycle line for at least partial recycling of the aliphatics stream to the reactor. According to the invention, an aromatics recycle line is provided which returns the aromatics stream at least partially as extractant into the extractive distillation column.