# US 11,439,721 B2 · Aldehyde scavenger and method for removing aldehydes

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- Number: US 11,439,721 B2
- Document ID: US11439721B2
- Status: Granted
- Kind: B2
- Application number: 16/466,232
- Filed: 2017-12-27
- Published: 2020-02-27
- Granted: 2022-09-13
- Earliest claimed: 2016-12-28
- Assignees: Tosoh Corporation; Sagami Chemical Research Institute
- Applicants: Tosoh Corporation; Sagami Chemical Research Institute
- Inventors: Yukinori Sudo; Takahiro Masuda; Osamu Kobayashi; Takuri Ozaki; Kenji Hirai
- Web page: https://patentgrep.com/patent/US11439721B2

## CPC

- A61L 9/014: containing sorbent material, e.g. activated carbon
- C07C 239/20: having oxygen atoms of hydroxylamino groups etherified
- A61L 9/01: Deodorant compositions {(compositions released by contact with a liquid A61L9/05)}
- B01D 53/02: by adsorption, e.g. preparative gas chromatography {(solid sorbent compositions B01J20/00, preparation of inorganic compounds or elements C01)}
- B01D 53/72: Organic compounds not provided for in groups B01D53/48 - B01D53/70, e.g. hydrocarbons
- B01J 20/3204: {Inorganic carriers, supports or substrates}
- B01J 20/3251: {comprising at least two different types of heteroatoms selected from nitrogen, oxygen or sulphur}
- C09K 3/00: Materials not provided for elsewhere
- B01D 2251/80: Organic bases or salts
- B01D 2252/20405: Monoamines
- B01D 2252/2041: Diamines
- B01D 2252/20415: Tri- or polyamines
- B01D 2252/20421: Primary amines
- B01D 2252/20431: Tertiary amines
- B01D 2252/20457: containing a pyridine-ring
- B01D 2253/102: Carbon
- B01D 2253/104: Alumina
- B01D 2253/106: Silica or silicates
- B01D 2253/202: Polymeric adsorbents
- B01D 2253/25: Coated, impregnated or composite adsorbents
- B01D 2257/70: Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
- B01D 2257/708: Volatile organic compounds V.O.C.'s
- B01D 2258/06: Polluted air
- B01D 2259/124: Liquid reactants
- B01D 2259/128: Solid reactants
- B01D 2259/4508: for cleaning air in buildings
- B01D 2259/4566: for use in transportation means
- A61L: METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES (preservation of bodies or disinfecting characterised by the agents employed A01N; preserving, e.g. sterilising, food or foodstuffs A23; preparations for medical, dental or toiletry purposes A61K)
- C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS
- 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)
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE

## Abstract

To provide an aldehyde scavenger and a method for removing aldehydes by using the same, for quickly and continuously capturing aldehydes. An aldehyde scavenger comprising at least one O-substituted hydroxylamine or at least one chemically acceptable salt thereof, is used against an aldehyde generation source.

## Claims

### Claim 1

A method for removing aldehydes, comprising:
bringing an aldehyde scavenger into contact with an aldehyde generation source to remove the aldehydes,
wherein the aldehyde scavenger includes at least one O-substituted hydroxylamine, or at least one chemically acceptable salt of the O-substituted hydroxylamine, and the chemically acceptable salt is at least one of a hydrochloride, a hydrobromide, a perchlorate, a silicate, a tetrafluoroborate, a hexafluorophosphate, a sulfate, a nitrate, a phosphate, an acetate, a citrate, a fumarate, a maleate, a trifluoromethanesulfonate, a trifluoroacetate, a benzoate, and a p-toluenesulfonic acid salt,
wherein the O-substituted hydroxylamine has formula (1)
R1—ONH2 (1)
where R1 is a methyl group or an ethyl group which, at a chemically acceptable position, is substituted by at least a carboxy group and is optionally further substituted by a phenyl group.

### Claim 2 (depends on 1)

The method of claim 1, wherein R1 is one of a carboxymethyl group, a 1-carboxyethyl group, a 2-carboxyethyl group, an α-carboxy benzyl group, an α-carboxy-phenethyl group, and a β-carboxy-phenethyl group.

### Claim 3 (depends on 1)

The method of claim 1, wherein R1 is a carboxymethyl group.

### Claim 4 (depends on 1)

The method of claim 1, wherein the aldehyde scavenger is included in an aqueous solution and brought into contact with the aldehyde generation source.

### Claim 5 (depends on 2)

The method of claim 2, wherein the aldehyde scavenger is included in an aqueous solution and brought into contact with the aldehyde generation source.

### Claim 6 (depends on 3)

The method of claim 3, wherein the aldehyde scavenger is included in an aqueous solution and brought into contact with the aldehyde generation source.

### Claim 7 (depends on 4)

The method of claim 4, wherein a content of the aldehyde scavenger included in an aqueous solution is within a range of from 1 to 50 wt %.

### Claim 8 (depends on 5)

The method of claim 5, wherein a content of the aldehyde scavenger included in an aqueous solution is within a range of from 1 to 50 wt %.

### Claim 9 (depends on 6)

The method of claim 6, wherein a content of the aldehyde scavenger included in an aqueous solution is within a range of from 1 to 50 wt %.

### Claim 10 (depends on 1)

The method of claim 1, wherein the aldehyde scavenger is supported on a carrier which is insoluble in water.

### Claim 11 (depends on 2)

The method of claim 2, wherein the aldehyde scavenger is supported on a carrier which is insoluble in water.

### Claim 12 (depends on 3)

The method of claim 3, wherein the aldehyde scavenger is supported on a carrier which is insoluble in water.

### Claim 13 (depends on 1)

The method of claim 1, wherein the aldehyde scavenger is supported on a polymeric carrier or an inorganic carrier which are insoluble in water.

### Claim 14 (depends on 2)

The method of claim 2, wherein the aldehyde scavenger is supported on a polymeric carrier or an inorganic carrier which are insoluble in water.

### Claim 15 (depends on 3)

The method of claim 3, wherein the aldehyde scavenger is supported on a polymeric carrier or an inorganic carrier which are insoluble in water.

### Claim 16 (depends on 1)

The method of claim 1, wherein the aldehyde generation source comprises a plywood or an automobile ceiling material.