Method for producing zeolite

Patent metadata

Field	Value
Publication number	US-10239760-B2
Application number	US-201715466185-A
Country	US
Kind code	B2
Filing date	Mar 22, 2017
Priority date	Sep 26, 2014
Publication date	Mar 26, 2019
Grant date	Mar 26, 2019

Abstract

There is provided a method for producing a zeolite more excellent in moisture absorption characteristics. The method includes physically pulverizing a zeolite that has a gradient of a Na/Si value from a surface of the zeolite in a depth direction, that has a proportion of the Na/Si value at a depth of 10 nm from the surface to the Na/Si value at the surface of 90% or more, and that has a proportion of the Na/Si value at a depth of 30 nm from the surface to the Na/Si value at the surface of 70% or more, the Na/Si value representing a composition ratio between Na and Si, and crystallizing the physically pulverized zeolite.

First claim

What is claimed is:

1. A method for producing a zeolite, the method comprising:
physically pulverizing a Na zeolite that has a gradient of a Na/Si value from a surface of the Na zeolite in a depth direction, that has a proportion of the Na/Si value at a depth of 10 nm from the surface to the Na/Si value at the surface of 90% or more, and that has a proportion of the Na/Si value at a depth of 30 nm from the surface to the Na/Si value at the surface of 70% or more, the Na/Si value representing a composition ratio between Na and Si; and
performing crystallization of the Na zeolite that was physically pulverized.

2. The method for producing a zeolite according to claim 1 ,
wherein the crystallization is performed by hydrothermal synthesis.

3. The method for producing a zeolite according to claim 1 ,
wherein the Na/Si value at a depth of 10 nm is larger than the Na/Si value at a depth of 30 nm.

4. The method for producing a zeolite according to claim 3 ,
wherein the crystallization is performed by hydrothermal synthesis.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Ueno Iwao
• Kosugi Naoki

Classifications

• C01P2006/90

  Other properties not specified above · CPC title

• B01J20/30

  Processes for preparing, regenerating, or reactivating · CPC title

• C01B39/14 Primary

  Type A · CPC title

• B01J20/18

  Synthetic zeolitic molecular sieves · CPC title

• C01B39/02

  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 title