Patent · US Expired

Method for the preparation of crystalline and zeolitic aluminosilicates

US5089243A · kind A · utility

7Cited by

2References

16Claims

0Family size

Assignee

Vereinigte Aluminium-Werke A.G. · DE

Inventors

Roland Thome · Bonn, DE
Hubertus Schmidt · Pocking, DE
Arno Tissler · Tegernheim, DE
Dieter Prescher · Schwandorf, DE

Key dates

Filing date	Jun 11, 1990
Grant date	Feb 18, 1992
Priority date	—
Expiry date	Jun 11, 2010

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S423/22
WIPO fieldMaterials, metallurgy
WIPO sectorChemistry

Abstract

The present invention relates to a method of preparing crystalline, zeolitic aluminosilicates with SiO.sub.2 /Al.sub.2 O.sub.3 ratios of 20 or more. The method provides a rapid, two-stage crystallization process which avoids the formation of secondary crystalline phases. The first stage is conducted at a temperature between 240.degree. C. and 325.degree. C. for between about 1 and 20 minutes. The second stage is conducted at a temperature between about 120.degree. C. and 225.degree. C. for about 1 to 100 hours.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.