Method for preparing crystalline aluminosilicates

US4376104A · kind A · utility

Assignee

• The British Petroleum Company Limited · GB

Inventors

• William J. Ball
• David G. Stewart · Epsom, GB

Key dates

• Filing date: Jun 23, 1981
• Grant date: Mar 8, 1983
• Expiry date: Jun 23, 2001

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S423/25
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Crystalline aluminosilicates having a high silica to alumina molar ratio are prepared by mixing a source of silica, a source of alumina, a source of alkali metal, water and one or more substituted neopentylamines having the formula: ##STR1## wherein R.sup.2 is H, OH or NH.sub.2 and R.sup.1 is a C.sub.1 to C.sub.6 alkyl group, and maintaining the mixture under conditions of elevated temperature and pressure, typically in the range from 80.degree. to 210.degree. C. and autogenous pressure for a time sufficient to effect formation of the aluminosilicate, typically not less than 4 hours. The molar ratio of silica to alumina in the initial mixture is suitably in the range from 10:1 to 150:1 and the amounts of alkali metal and neopentylamine are suitably in the range from 2:1 to 0.02:1 and 10:1 to 0.02:1 respectively moles per mole equivalent of total silica and alumina in the respective sources. Depending on the ratio of silica to alumina in the initial mixture crystalline aluminosilicates having a mordenite structure or a ZSM-5 type zeolite structure or mixtures thereof may be prepared. Mordenites having a silica to alumina ratio greater than 10:1 can be prepared.