# US 11,077,424 B2 · Oxygen scavenger composition

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- Number: US 11,077,424 B2
- Document ID: US11077424B2
- Status: Granted
- Kind: B2
- Application number: 16/086,401
- Filed: 2017-01-24
- Published: 2019-03-21
- Granted: 2021-08-03
- Earliest claimed: 2016-03-30
- Assignees: Mitsubishi Gas Chemical Company, Inc.
- Applicants: Mitsubishi Gas Chemical Company, Inc.
- Inventors: Ken Sugimoto; Yoshinobu Miyabe; Shinichi Ikeda; Kouta Kagimoto; Ryoujyu Narikawa
- Web page: https://patentgrep.com/patent/US11077424B2

## CPC

- B01J 20/28019: {Spherical, ellipsoidal or cylindrical}
- B01D 53/0407: {Constructional details of adsorbing systems}
- B01D 53/14: by absorption
- B01D 53/261: {by adsorption}
- B01J 20/02: comprising inorganic material
- B01J 20/0229: {Compounds of Fe}
- B01J 20/14: Diatomaceous earth
- B01J 20/20: comprising free carbon; comprising carbon obtained by carbonising processes
- B01J 20/28: characterised by their form or physical properties
- B01J 20/28004: {Sorbent size or size distribution, e.g. particle size}
- B01D 2252/10: Inorganic absorbents
- B01D 2253/106: Silica or silicates
- B01D 2253/112: Metals or metal compounds not provided for in B01D2253/104 or B01D2253/106
- B01D 2253/34: Specific shapes
- B01D 2256/10: Nitrogen
- B01D 2257/104: Oxygen
- B01D 2259/4525: for storage and dispensing systems
- B01J 20/3028: {Granulating, agglomerating or aggregating}
- B01J 2220/42: Materials comprising a mixture of inorganic materials (materials coated or impregnated on a carrier B01J20/32)
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- 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)

## Abstract

The present invention provides an oxygen scavenger composition comprising a granule having: an α layer containing a water retention agent, a swelling agent, a metal salt and water; a β layer containing iron; and a γ layer containing a porous support, wherein the granule forms a layer structure in order of the α layer, the β layer and the γ layer from an inside to an outside of the granule.

## Claims

### Claim 1

An oxygen scavenger composition comprising a granule comprising:
an α layer comprising a water retention agent, a swelling agent, a metal salt and water;
a β layer consisting of iron in an amount of from 80% by mass to 100% by mass of the layer, with the balance being at least one auxiliary selected from the group consisting of powders of silica, hydrophobic silica, magnesium stearate, calcium stearate, activated carbon, zeolite, pearlite, diatomaceous earth, activated clay, kaolin, talc, bentonite, activated alumina, gypsum, silica alumina, calcium silicate, magnesium oxide, graphite, carbon black, aluminum hydroxide, iron oxide; and
a γ layer comprising a porous support,
wherein the granule forms a layer structure in order of the α layer, the β layer, and the γ layer from an inside to an outside of the granule, and
wherein the α and γ layers do not include any of the auxiliaries contained in the β layer.

### Claim 2 (depends on 1)

The oxygen scavenger composition according to claim 1, wherein the water retention agent comprises one or more selected from the group consisting of diatomaceous earth, silica and activated carbon.

### Claim 3 (depends on 1)

The oxygen scavenger composition according to claim 1, wherein the swelling agent comprises one or more selected from the group consisting of carboxymethylcellulose calcium, carboxymethylcellulose sodium, calcium bentonite and sodium bentonite.

### Claim 4 (depends on 1)

The oxygen scavenger composition according to claim 1, wherein the granule comprises the α layer in an amount of 30% by mass or more and 50% by mass or less, the β layer in an amount of 49% by mass or more and 69% by mass or less, and the γ layer in an amount of 0.1% by mass or more and 5.0% by mass or less, based on a total amount of the granule.

### Claim 5 (depends on 1)

The oxygen scavenger composition according to claim 1, wherein the α layer contains the swelling agent in an amount of 1.0% by mass or more and 10% by mass or less, based on a total amount of the α layer.

### Claim 6 (depends on 1)

The oxygen scavenger composition according to claim 1, wherein the β layer consists of more than 90% by mass iron.

### Claim 7 (depends on 6)

The oxygen scavenger composition according to claim 6, wherein the β layer consists of more than 99.9% by mass iron.