Methods for reactivating zeolites

US4043938A · kind A · utility

Assignee

• VEB Leuna Werke Walter Ulbricht · DE

Inventors

• Hans-Heinrich Reif
• Klaus Wehner
• Jurgen Welker
• Karl-Heinz Schmidt
• Waltraud Schnick
• Lutz Widmann
• Otto Schicker
• Gunter Seidel · Oberhausen, DE
• Karsten Kalb · Hersbruck, DE
• Wolfhard Dollase
• Helmut Furtig
• Werner Hose
• Wolfgang Roscher
• Udo Hadicke
• Herbert Knoll
• Rudiger Seidel · Sandersdorf, DE
• Gunter Nemitz
• Edith Sturmer
• Manfred Kaiser

Key dates

• Filing date: Feb 3, 1975
• Grant date: Aug 23, 1977
• Expiry date: Feb 3, 1995

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C10G25/12
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A zeolite of type 5A, which has been used to separate normal paraffins from a hydrocarbon mixture containing normal paraffins by bringing the hydrocarbon mixture into contact with the zeolite whereby the zeolite absorbs the normal paraffins and then desorbing the normal paraffins from the zeolite by contacting the zeolite with water-containing ammonia vapour, is reactivated by first contacting the zeolite with at least one of water, aqueous solutions and water-containing gases at a temperature below 350.degree. C and then heating the zeolite to a temperature above 350.degree. C.