Process for preparing fine zeolite particles

• US 20050079994A1
• Filed: 09/30/2004
• Published: 04/14/2005
• Est. Priority Date: 11/09/1999
• Status: Active Grant

• Current Assignee: KAO Corporation
• Original Assignee: KAO Corporation
• Inventors: Taguchi, Kazuo, Kitagaito, Hiroshi, Takaya, Hitoshi, Hosokawa, Hiroji, Oki, Kazuo, Sakaguchi, Mikio
• Granted Patent: US 7,211,555 B2
• Time in Patent Office: Days
• US Class Current: 510/532
• CPC Class Codes: C01B 39/02 Crystalline aluminosilicate zeolites; Isomorphous compounds thereof; Direct preparation thereof; Preparation thereof starting from a reaction mixture containing a crystalline zeolite of another type, or from preformed reactants; After-treatment thereof
• CPC Class Codes: C01B 39/14 Type A
• CPC Class Codes: C11D 3/128 Aluminium silicates, e.g. zeolites C11D3/1253 takes precedence

Abstract

A process for efficiently preparing fine zeolite particles comprising synthesizing zeolite in the presence of an alkaline earth metal-containing compound and/or with controlling the preparation process of zeolite, thereby giving fine zeolite particles being composed of crystalline aluminosilicate, the fine zeolite particles having a fine average primary particle size, being excellent in the cationic exchange properties and the oil-absorbing ability, having a fine average aggregate particle size, and being excellent in the dispersibility; fine zeolite particles obtainable by the above process; and a detergent composition comprising the fine zeolite particles, the detergent composition being excellent in the detergency.

Claims

1-14. -14. (canceled)

15. A process for preparing fine zeolite particles comprising reacting a silica source with an aluminum source in the presence of an alkaline earth metal-containing compound by feeding for reaction an aluminum source and/or a silica source into a circulating line connecting between an outlet for a reaction tank and an inlet of a mixer.

16. The process according to claim 15, wherein the aluminum source is supplied to the reaction tank and circulated into the circulating line, and wherein the silica source is fed into the circulating line.

17. The process according to claims 15 or 16, wherein the aluminum source and the silica source are mixed in the circulating line at a mixing ratio of 0.1 to 3, as expressed by an SiO₂/Al₂O₃ molar ratio.

18. The process according to claims 15 or 16, wherein the fine zeolite particles have an average primary particle size of 1.5 μ

m or less.

19. The process according to claims 15 or 16, wherein the fine zeolite particles have the general formula in anhydride form:

xM₂O·

ySiO₂·

Al₂O₃·

zMeO,

wherein M is an alkali metal;

Me is an alkaline earth metal;

x is a number of 0.2 to 2;

y is a number of 0.5 to 6; and

z is a number of 0.005 to 0.1.

20. The process according to claims 15 or 16, wherein the fine zeolite particles have a cationic exchange speed of 150 mg CaCO₃/g or more.

21. Fine zeolite particles obtainable by the process according to the process of claims 15 or 16.

22. A detergent composition comprising the fine zeolite particles of claims 15 or 16.