# US 10,864,497 B2 · Acid-treated filter aid blend

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- Number: US 10,864,497 B2
- Document ID: US10864497B2
- Status: Granted
- Kind: B2
- Application number: 16/073,417
- Filed: 2017-01-27
- Published: 2019-02-07
- Granted: 2020-12-15
- Earliest claimed: 2016-01-28
- Assignees: Imerys USA, Inc.
- Applicants: Imerys USA, Inc.
- Inventors: Jeffrey D. Taniguchi; Larisa Tihomirov
- Web page: https://patentgrep.com/patent/US10864497B2

## CPC

- B01J 20/103: {comprising silica}
- A23F 3/20: Removing unwanted substances ({A23F3/166 takes precedence; } reducing or removing alkaloid content A23F3/38)
- A23L 2/72: by filtration
- B01D 37/02: Precoating the filter medium; Addition of filter aids to the liquid being filtered {(devices for feeding reagents C02F1/685 and sub-groups; filter aids)}
- B01J 20/10: comprising silica or silicate
- B01J 20/106: {Perlite}
- B01J 20/14: Diatomaceous earth
- B01J 20/28011: {Other properties, e.g. density, crush strength}
- B01J 20/28092: {Bimodal, polymodal, different types of pores or different pore size distributions in different parts of the sorbent}
- B01J 20/30: Processes for preparing, regenerating, or reactivating
- B01J 20/3085: {Chemical treatments not covered by groups B01J20/3007 - B01J20/3078}
- C12H 1/063: {Separation by filtration}
- A23V 2002/00: Food compositions, function of food ingredients or processes for food or foodstuffs
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- A23F: COFFEE; TEA; THEIR SUBSTITUTES; MANUFACTURE, PREPARATION, OR INFUSION THEREOF
- A23L: FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES, NOT OTHERWISE PROVIDED FOR; PREPARATION OR TREATMENT THEREOF (preservation thereof A23B)
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)
- C12H: PASTEURISATION, STERILISATION, PRESERVATION, PURIFICATION, CLARIFICATION OR AGEING OF ALCOHOLIC BEVERAGES; METHODS FOR ALTERING THE ALCOHOL CONTENT OF FERMENTED SOLUTIONS OR ALCOHOLIC BEVERAGES (simulation ageing by flavouring C12G3/06)
- A23V: INDEXING SCHEME RELATING TO FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES AND LACTIC OR PROPIONIC ACID BACTERIA USED IN FOODSTUFFS OR FOOD PREPARATION

## 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.

## Claims

### Claim 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 d50 greater than the second particle size distribution;
wherein the first silica-based filter aid has a d50 in a range from about 10 μm to about 50 μm; and
wherein the second silica-based filter aid has a d50 in a range from about 0.5 μm to about 15 μm.

### Claim 2 (depends on 1)

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.

### Claim 3 (depends on 2)

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

### Claim 4 (depends on 1)

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.

### Claim 5 (depends on 1)

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.

### Claim 6 (depends on 2)

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.

### Claim 7 (depends on 4)

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.

### Claim 8 (depends on 1)

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.

### Claim 9 (depends on 1)

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.