Use of naturally acid smectites to remove olefins from aromatics or aromatic mixtures and processes therewith

US6166278A · kind A · utility

Assignee

• Sud-Chemie A.G. · DE

Inventors

• Thomas Engelhardt · Rheinfelden (Baden), DE
• Uwe Flessner · Hersbruck, DE
• Reinhard Hahn · Vilsheim, DE
• Werner Zschau · Germering, DE

Key dates

• Filing date: Sep 30, 1997
• Grant date: Dec 26, 2000
• Expiry date: Sep 30, 2017

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C2521/16
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A catalyst for removing olefins from aromatic compounds or mixtures of aromatic compounds wherein the catalyst is a naturally acidic smectite clay containing exchangeable cations wherein the naturally acidic smectite clay has a cation exchange capacity of 40 to 80 meq./100 g. and wherein the exchangeable cations include 5 to 70 meq./100 g. of Al.sup.3+ cations, a process for the preparation of this catalyst including treating a naturally acidic smectite clay with an aluminum salt solution wherein the salt solution includes Al.sup.3+ ions at a concentration of at least 10 meq./100 g. of the catalyst, and a process for the removal of olefins from aromatic compounds or mixtures of aromatic compounds using the above-described catalyst.