Co-agglomerated composite materials

Patent metadata

Field	Value
Publication number	US-10556221-B2
Application number	US-201816154116-A
Country	US
Kind code	B2
Filing date	Oct 8, 2018
Priority date	Jun 26, 2012
Publication date	Feb 11, 2020
Grant date	Feb 11, 2020

Abstract

A composite filter aid may include diatomaceous earth, natural glass, and a precipitated silica binder, wherein the filter aid has a permeability ranging from 3 to 20 darcys. A composite filter aid may include diatomaceous earth, perlite, and a precipitated silica binder, wherein the filter aid has an alpha density less than 15 lbs/ft3. A method for making a composite material may include blending diatomaceous earth and perlite, adding alkali silicate to the blended diatomaceous earth and perlite, and precipitating the alkali silicate as a binder to make the composite material. A method for filtering a beverage may include using a composite filter aid and/or composite material.

First claim

What is claimed is:

1. A composite filter aid comprising co-agglomerated particles that comprise:
diatomaceous earth;
perlite; and
an alkali silicate binder,
wherein the co-agglomerated particles have a median pore size ranging from 5 microns to 35 microns, a pore volume ranging from 3 to 7 milliliters per gram, and a d10 ranging from 10 to 30 microns.

2. The composite filter aid of claim 1 , wherein the diatomaceous earth comprises calcined diatomaceous earth, flux calcined diatomaceous earth, or a mixture thereof.

3. The composite filter aid of claim 1 , wherein the co-agglomerated particles have a d 50 diameter ranging from 30 microns to 70 microns.

4. The composite filter aid of claim 1 , wherein the co-agglomerated particles have a d 10 diameter ranging from 15 microns to 30 microns.

5. The composite filter aid of claim 1 , wherein the co-agglomerated particles have a d 90 diameter ranging from 80 microns to 120 microns.

6. The composite filter aid of claim 1 , wherein the filter aid has a BET surface area ranging from 5 m 2 /g to about 50 m 2 /g.

7. The composite filter aid of claim 1 , wherein the diatomaceous earth has a median pore size ranging from 15 microns to 30 microns.

8. The composite filter aid of claim 1 , wherein the diatomaceous earth has a surface area ranging from 5 m 2 /g to 40 m 2 /g.

9. The composite filter aid of claim 1 , wherein the pore volume ranges from 5 milliliters per gram to 7 milliliters per gram.

10. The composite filter aid of claim 1 , wherein the filter aid has a beer soluble iron content of less than 5 ppm, as measured by the American Society of Brewing Chemists (ASBC) method.

11. The composite filter aid of claim 1 , wherein the filter aid has a beer soluble iron content of less than 1 ppm, as measured by the ASBC method.

12. The composite filter aid of claim 1 , wherein the filter aid has a cristobalite content of less than 6% by weight.

13. The composite filter aid of claim 1 , wherein the filter aid has a cristobalite content of less than 1% by weight.

14. The composite filter aid of claim 1 , wherein the filter aid has an alpha density ranging from 9 lbs/ft 3 to 15 lbs/ft 3 .

15. The composite filter aid of claim 1 , wherein the filter aid has a permeability ranging from 2 darcys to 20 darcys.

16. A method for making a co-agglomerated material, the method comprising:
blending diatomaceous earth, perlite and an alkali silicate to form co-agglomerated particles,
wherein the diatomaceous earth has a median pore size ranging from 5 microns to 35 microns, a pore volume ranging from 3 to 7 milliliters per gram and a d10 ranging from 10 to 30 microns.

17. The composite filter aid of claim 16 , wherein the natural glass comprises at least one of perlite, volcanic ash, pumice, shirasu, obsidian, pitchstone, or rice hull ash.

18. The composite filter aid of claim 16 , wherein the co-agglomerated particles have a d 50 diameter ranging from 30 microns to 70 microns.

19. The composite filter aid of claim 16 , wherein the co-agglomerated particles have a d 10 diameter ranging from 15 microns to 30 microns.

Assignees

• Imerys Filtration Minerals Inc
• Imerys Usa Inc

Inventors

• Wang Bo

Classifications

• B01J20/106

  Perlite · CPC title

• B01J20/28076

  being more than 1.0 ml/g · CPC title

• B01J20/28004

  Sorbent size or size distribution, e.g. particle size · CPC title

• B01J20/14 Primary

  Diatomaceous earth · CPC title

• B01J20/3078

  Thermal treatment, e.g. calcining or pyrolizing · CPC title