Method for producing beta zeolite

Patent metadata

Field	Value
Publication number	US-10501328-B2
Application number	US-201615549458-A
Country	US
Kind code	B2
Filing date	Feb 8, 2016
Priority date	Feb 9, 2015
Publication date	Dec 10, 2019
Grant date	Dec 10, 2019

Abstract

Provided is a method for producing a beta zeolite, which is a seed crystal addition method that is capable of reducing the environmental load as much as possible. A method for producing a beta zeolite according to the present invention comprises a step wherein a reaction mixture that contains a silica source, an alumina source, an alkali source and water and a seed crystal that is composed of a beta zeolite are mixed with each other and heated. A beta zeolite which comprises particles having a particle size of 10 μm or less in an amount of 90% or more on a volume basis in the particle size distribution as determined by a laser diffraction/scattering particle size distribution measuring method, and which is synthesized without using an organic structure-directing agent is used as the seed crystal.

First claim

The invention claimed is:

1. A method for producing a beta zeolite, comprising:
mixing a reaction mixture comprising a silica source, an alumina source, an alkali source and water with a seed crystal comprising a beta zeolite and heating the mixture,
wherein a beta zeolite synthesized without using an organic structure-directing agent and comprising particles having a particle size of 10 μm or less in an amount of 90% or more on a volume basis in the particle size distribution as determined by a laser diffraction/scattering particle size distribution measuring method is used as the seed crystal.

2. The method for producing a beta zeolite according to claim 1 , wherein a beta zeolite synthesized using an organic structure defining agent and calcined is further used as the seed crystal.

3. The method for producing a beta zeolite according to claim 2 , wherein, in the seed crystal, the content of the beta zeolite synthesized without using an organic structure defining agent is 10% by mass or more and less than 100% by mass.

4. The method for producing a beta zeolite according to claim 3 , wherein compositions of the reaction mixture represented by molar ratios are in ranges:
SiO 2 /Al 2 O 3 =8 to 40
Na 2 O/SiO 2 =0.05 to 0.3
H 2 O/SiO 2 =5 to 50.

5. The method for producing a beta zeolite according to claim 3 , wherein the seed crystal is mixed into the reaction mixture in a state of solid-liquid mixture.

6. The method for producing a beta zeolite according to claim 3 , wherein the mixed amount of the seed crystal is 1% by mass or more and 30% by mass or less relative to the mass of the silica source contained in the reaction mixture.

7. The method for producing a beta zeolite according to claim 3 , wherein the SiO 2 /Al 2 O 3 ratio of the seed crystal is 8 or more and 30 or less.

8. The method for producing a beta zeolite according to claim 2 , wherein compositions of the reaction mixture represented by molar ratios are in ranges:
SiO 2 /Al 2 O 3 =8 to 40
Na 2 O/SiO 2 =0.05 to 0.3
H 2 O/SiO 2 =5 to 50 .

9. The method for producing a beta zeolite according to claim 2 , wherein the seed crystal is mixed into the reaction mixture in a state of solid-liquid mixture.

10. The method for producing a beta zeolite according to claim 2 , wherein the mixed amount of the seed crystal is 1% by mass or more and 30% by mass or less relative to the mass of the silica source contained in the reaction mixture.

11. The method for producing a beta zeolite according to claim 2 , wherein the SiO 2 /Al 2 O 3 ratio of the seed crystal is 8 or more and 30 or less.

12. The method for producing a beta zeolite according to claim 1 , wherein compositions of the reaction mixture represented by molar ratios are in ranges:
SiO 2 /Al 2 O 3 =8 to 40
Na 2 O/SiO 2 =0.05 to 0.3
H 2 O/SiO 2 =5 to 50.

13. The method for producing a beta zeolite according to claim 12 , wherein the seed crystal is mixed into the reaction mixture in a state of solid-liquid mixture.

14. The method for producing a beta zeolite according to claim 12 , wherein the mixed amount of the seed crystal is 1% by mass or more and 30% by mass or less relative to the mass of the silica source contained in the reaction mixture.

15. The method for producing a beta zeolite according to claim 12 , wherein the SiO 2 /Al 2 O 3 ratio of the seed crystal is 8 or more and 30 or less.

16. The method for producing a beta zeolite according to claim 1 , wherein the seed crystal is mixed into the reaction mixture in a state of solid-liquid mixture.

17. The method for producing a beta zeolite according to claim 16 , wherein the mixed amount of the seed crystal is 1% by mass or more and 30% by mass or less relative to the mass of the silica source contained in the reaction mixture.

18. The method for producing a beta zeolite according to claim 16 , wherein the SiO 2 /Al 2 O 3 ratio of the seed crystal is 8 or more and 30 or less.

19. The method for producing a beta zeolite according to claim 1 , wherein the mixed amount of the seed crystal is 1% by mass or more and 30% by mass or less relative to the mass of the silica source contained in the reaction mixture.

20. The method for producing a beta zeolite according to claim 1 , wherein the SiO 2 /Al 2 O 3 ratio of the seed crystal is 8 or more and 30 or less.

Assignees

• Unizeo Co Ltd
• Univ Tokyo
• Mistui Mining & Smelting Co Ltd

Inventors

• Itabashi Keiji
• Elangovan Shanmugam Palani
• Sodeyama Kyosuke
• Okubo Tatsuya

Classifications

• C01B39/46 Primary

  Other types characterised by their X-ray diffraction pattern and their defined composition {(C01B39/023, C01B39/026, C01B39/06 take precedence)} · CPC title

• C01B39/48

  using at least one organic template directing agent · CPC title

• B01J29/7007

  Zeolite Beta · CPC title