Claims
- 1. Process for manufacturing an alkali metal aluminosilicate of zeolite P type having the oxide formula
- M.sub.2/n O, Al.sub.2 O.sub.3, 1.9-2.6 SiO.sub.2, y H.sub.2 O
- y being the water content, wherein sodium silicate, sodium aluminate and sodium hydroxide are mixed together to produce a first reacting gel having the general formula:
- 2.5-7.5 Na.sub.2 O, 2.2-4.0 SiO.sub.2, Al.sub.2 O.sub.3, 60-250 H.sub.2 O
- said first reacting gel being then allowed to react sufficiently until zeolite P nuclei are formed,
- sodium aluminate solution being then added to said first reacting gel, while its degree of crystallinity is below 25%, in a sufficient amount so as to produce a second reacting gel having the general formula:
- 2.3-7.5 Na.sub.2 O, 1.9-2.6 SiO.sub.2, Al.sub.2 O.sub.3, 40-150 H.sub.2 O
- said second reacting gel being allowed to react to provide said alkali metal aluminosilicate of zeolite P type having the indicated oxide formula, the resulting product being filtered washed and dried.
- 2. Process according to claim 1 for manufacturing an alkali metal aluminosilicate of zeolite P type having the oxide formula
- M.sub.2/n, Al.sub.2 O.sub.3, 1.9-2.1 SiO.sub.2, y H.sub.2 O
- y being the water content, wherein sodium silicate, sodium aluminate and sodium hydroxide are mixed together to produce a first reacting gel having the general formula:
- 2.5-7.5 Na.sub.2 O, 2.2-3.0 SiO.sub.2, Al.sub.2 O.sub.3, 60-250 H.sub.2 O
- said first reacting gel being then allowed to react sufficiently until zeolite P nuclei are formed, sodium aluminate solution being then added to said first reacting gel, while its degree of crystallinity is below 10%, in a sufficient amount so as to produce a second reacting gel having the general formula:
- 2.5-7.5 Na.sub.2 O, 1.9-2.2 SiO.sub.2, Al.sub.2 O.sub.3, 40-150 H.sub.2 O
- said second reacting gel being allowed to react to provide said alkali metal aluminosilicate of zeolite P type having the indicated oxide formula, the resulting product being filtered washed and dried.
Priority Claims (1)
Number |
Date |
Country |
Kind |
9402160 |
Feb 1994 |
GBX |
|
Parent Case Info
This application claims benefit of international application PCT/EP95/00103, filed Jan. 11, 1995.
PCT Information
Filing Document |
Filing Date |
Country |
Kind |
102e Date |
371c Date |
PCT/EP95/00103 |
1/11/1995 |
|
|
12/19/1996 |
12/19/1996 |
Publishing Document |
Publishing Date |
Country |
Kind |
WO95/21125 |
8/10/1995 |
|
|
US Referenced Citations (13)
Foreign Referenced Citations (3)
Number |
Date |
Country |
384070 |
Aug 1990 |
EPX |
565364 |
Oct 1993 |
EPX |
2256720 |
Nov 1987 |
JPX |