Acid-treated filter aid blend

Patent metadata

Field	Value
Publication number	US-10864497-B2
Application number	US-201716073417-A
Country	US
Kind code	B2
Filing date	Jan 27, 2017
Priority date	Jan 28, 2016
Publication date	Dec 15, 2020
Grant date	Dec 15, 2020

Abstract

A filter aid composition may include a first acid-treated silica-based filter aid having a first particle size distribution and a second acid-treated silica-based filter aid having a second particle size distribution. A method of making a filter aid composition may include providing a first silica-based filter aid having a first particle size distribution, providing a second silica-based filter aid having a second particle size distribution, and blending the first silica-based filter aid with the second silica-based filter aid to form the filter aid composition. A method of filtering a fluid may include providing a filter aid composition including a first acid-treated silica-based filter aid and a second acid-treated silica-based filter aid and filtering the fluid through the filter aid composition. The filter aid composition may have a multimodal particle size distribution such that the first particle size distribution has a d50 greater than the second particle size distribution.

First claim

What is claimed is:

1. A method of making a filter aid composition, the method comprising:
providing a first silica-based filter aid having a first particle size distribution;
providing a second silica-based filter aid having a second particle size distribution; and
blending the first silica-based filter aid with the second silica-based filter aid to form the filter aid composition,
wherein the filter aid composition has a multimodal particle size distribution such that the first particle size distribution has a d 50 greater than the second particle size distribution;
wherein the first silica-based filter aid has a d 50 in a range from about 10 μm to about 50 μm; and
wherein the second silica-based filter aid has a d 50 in a range from about 0.5 μm to about 15 μm.

2. The method of claim 1 , further comprising acid-treating the first silica-based filter aid composition prior blending with the second silica-based filter aid composition.

3. The method of claim 2 , wherein the acid is selected from the group consisting of oxalic acid and glacial acetic acid.

4. The method of claim 1 , further comprising acid-treating the second silica-based filter aid composition prior blending with the first silica-based filter aid composition.

5. The method of claim 1 , further comprising acid-treating the filter aid composition after blending the first silica-based filter aid with the second silica-based filter aid.

6. The method of claim 2 , wherein the acid-treated first silica-based filter aid has a soluble iron content less than or equal to about 20 ppm.

7. The method of claim 4 , wherein the acid-treated second silica-based filter aid has a soluble iron content less than or equal to about 20 ppm.

8. The method of claim 1 , wherein the filter aid composition has a permeability in a range from about 0.05 Darcies to about 0.2 Darcies.

9. The method of claim 1 , wherein the filter aid composition comprises from about 5 wt % to about 95 wt % of the first silica-based filter aid.

Assignees

• Imerys Usa Inc

Inventors

• Taniguchi Jeffrey D
• Tihomirov Larisa

Classifications

• B01J20/106

  Perlite · CPC title

• B01J20/14

  Diatomaceous earth · CPC title

• B01J20/30

  Processes for preparing, regenerating, or reactivating · CPC title

• B01J20/10

  comprising silica or silicate · CPC title

• B01J20/3085

  Chemical treatments not covered by groups B01J20/3007 - B01J20/3078 · CPC title