Process for preparing a pentasil zeolite

US4721609A · kind A · utility

Assignee

• Degussa AG · DE

Inventors

• Michael Baacke · Hanau, DE
• Peter Kleinschmit · Hanau, DE

Key dates

• Filing date: Sep 2, 1986
• Grant date: Jan 26, 1988
• Expiry date: Sep 2, 2006

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S423/34
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Templating compounds of the formula: EQU (HO--C.sub.2 H.sub.4).sub.3 N.sup..sym. --(CH.sub.2).sub.n -N.sup..sym. (C.sub.2 H.sub.4 --OH).sub.3 2 Br.sup..crclbar. wherein n equals 3, 4 or 5 are produced by reacting triethanolamine with .alpha., .omega.dibromoalkanes, for example in the presence of a solvent. One can also react dibromoalkane with the triethanolamine in dropwise manner at reaction temperature. The product is subsequently recovered by known methods. The templating compositions can be used for the preparation of the zeolites of the pentasil types. These zeolites have the composition represented by the summary formula: EQU (0.4-0.7)Na.sub.2 O/(0.3-0.6)Q.sub.2 O/Al.sub.2 O.sub.3 /(30-80)SiO.sub.2 /(4-10)H.sub.2 O and have the following X-ray diffraction pattern: ______________________________________ d .ANG. I/Io ______________________________________ 11.0 .+-. 0.2 30-70 10.0 .+-. 0.2 30-80 4.4 .+-. 0.1 10-20 4.3 .+-. 0.1 10-20 3.85 .+-. 0.05 100 3.74 .+-. 0.05 40-65 3.66 .+-. 0.05 20-40 3.43 .+-. 0.03 15-25 2.01 .+-. 0.02 5-15 1.99 .+-. 0.02 5-15 ______________________________________ They are prepared by utilizing an aqueous suspension of precipitated silica and mixing w…