Process for preparing a large molecular sieve
US5593655A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 9, 1995 |
| Grant date | Jan 14, 1997 |
| Priority date | — |
| Expiry date | May 9, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B39/00
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The present invention relates to a process for the preparation of a large-pore molecular sieve, comprising crystallizing the molecular sieve from a starting mixture at a pH in the range of from 3 to 8, and recovering a large-pore molecular sieve, the said starting mixture having a molar composition satisfying the following molar ratio's: EQU (0.01-2)R.sub.2/n O):(0-1.5)M.sub.2/m O:(0-0.5)X.sub.2 O.sub.3 :1YO.sub.2 :(5-1000)H.sub.2 O:(0.01-3)F.sup.-, wherein n and m are the weighted average valences of R and M respectively, M is an alkali- or alkaline earth metal, X is a trivalent metal and Y is a tetravalent element, wherein R comprises at least one main organic template R.sub.m having the formula R.sub.1 R.sub.2 R.sub.3 R.sub.4 Q.sup.+ wherein Q is nitrogen or phosphorus and wherein at least one and at most three of R.sub.1, R.sub.2, R.sub.3 and R.sub.4 is an aryl or alkyl group having 6 to 36 carbon atoms and each of the remainder of R.sub.1, R.sub.2, R.sub.3 and R.sub.4 is selected from hydrogen and an alkyl group having 1 to 5 carbon atoms.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.