Process for the production of a seed mixture for the synthesis of faujasite

• US 5,154,904 A
• Filed: 10/28/1986
• Issued: 10/13/1992
• Est. Priority Date: 10/29/1985
• Status: Expired due to Fees

• Current Assignee: Degussa AG (Rag-Stiftung)
• Original Assignee: Degussa AG (Rag-Stiftung)
• Inventors: Kriechbaum, Gangolf, Kleinschmit, Peter, Strack, Hans
• Primary Examiner(s): Breneman, R. Bruce
• Application Number:
  US07/924,213
• Time in Patent Office: 2,177 Days
• Field of Search: 502/79, 423/328, 423/329
• US Class Current: 423/709
• CPC Class Codes: C01B 39/20 Faujasite type, e.g. type X or Y
• CPC Class Codes: Y10S 423/21 Faujasite, e.g. X, Y, CZS-3, ECR-4, Z-14HS, VHP-R

Abstract

Precipitated silica is mixed with a solution of caustic soda, water and sodium aluminate to form a mixture of the composition:

12±3 Na₂ O:Al₂ O₃ :12±3 SiO₂ :200±60 H₂ O. This mixture was aged for 18-72 hours.

Claims

1. A process for the production of a seed mixture for the synthesis of faujasite comprising the steps of

a) diluting aqueous sodium hydroxide with water to a solution of 300-600 grams of Na₂ O per liter of solution:

b) heating the diluted aqueous sodium hydroxide to a temperature of 50°

to 80°

C. and maintaining that temperature while;

c) adding precipitated silica to the diluted aqueous sodium hydroxide;

d) allowing the aqueous sodium hydroxide/silica mixture obtained in step (c) to cool or maintaining a temperature of 30°

to 70°

C.;

e) adding aqueous sodium aluminate liquor to the mixture obtained in step (d);

f) aging the aqueous sodium hydroxide/silica/sodium aluminate mixture obtained in step (c) at 30°

-40°

C. for 18-72 hours;

wherein the precipitated silica and sodium aluminate are added in amounts such that, after step (e), the mixture has a composition Na₂ O;

Al₂ O₃ ;

SiO₂ ;

H₂ O equal to (9-15);

(1);

(9-15);

140-260.

2. The process according to claim 1, wherein, after step (e), the mixture has a composition Na₂ O:

Al₂ O₃ ;

SiO₂ ;

H₂ O equal to (11.5 to 13.5);

(1);

(11.5 to 13.5);

(200) and the ratio (Na_O);

(SiO₂) equals 1;

1.