Process for producing synthetic zeolites with MFI structure

US7244409B2 · kind B2 · utility

Assignee

• Sud Chemie, Inc. · US

Inventors

• Gotz Burgfels · Bad Aibling, DE
• Josef Schönlinner · Obing, DE
• Friedrich Schmidt · Wuppertal, DE

Key dates

• Filing date: Sep 13, 2005
• Grant date: Jul 17, 2007
• Expiry date: Sep 13, 2025

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S423/22
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A process is described for producing synthetic zeolites useful as catalysts with a MFI structure, a Si/Al atomic ratio from about 8 to 45 to 1 and very small primary crystallites. A Si source, an Al source and an organic template are reacted with one another under hydrothermal conditions. The process is carried out in the presence of seed crystals with an average particle size from roughly 10 to 100 nm, preferably from 20 to 50 nm, prepared from an earlier batch of synthetic zeolites with a MFI structure, without separation from the mother liquor. The process further includes conversion by ion exchange of the zeolites into an H form. Moldings may also be produced by the addition of binders and optionally catalytically active base metal and/or precious metal components before or after the moldings are produced. The zeolites as claimed in the invention are characterized by the combination of the following features: