Process for preparing silicoaluminophosphate (SAPO) molecular sieves, catalysts containing said sieves and catalytic dehydration processes using said catalysts

US8603431B2 · kind B2 · utility

Assignee

• Casale Chemicals SA · CH

Inventors

• Cristina Ferrini · Breganzona, CH
• Daniel Herein · Frankfurt, DE
• David Linke · Berlin, DE
• Uwe Rodemerck · Rostock, DE
• Evgeny Kondratenko · Rostock, DE

Key dates

• Filing date: Jun 30, 2008
• Grant date: Dec 10, 2013
• Expiry date: Mar 5, 2030

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P30/40
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A new process for producing a SAPO molecular sieve is disclosed wherein a mixture of a P source with an Al source is subjected to a digestion step under stirring before adding a Si source and a template. The slurry resulting after addition of all chemicals is subjected to a pH adjustment followed by the usual hydrothermal treatment at higher temperature in an autoclave. In this way, very pure highly crystalline SAPO molecular sieves such as SAPO-34 are obtained with a very high yield. In addition, the SAPOs produced this way have an exceptional activity in the dehydration reactions and can be employed as a active component of catalysts for the production of valuable dehydration products from methanol such as, but not limited to, olefins and dimethylether (DME).