# US 9,517,435 B2 · Formaldehyde absorbent and method for using the same

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- Number: US 9,517,435 B2
- Document ID: US9517435B2
- Status: Granted
- Kind: B2
- Application number: 14/119,754
- Filed: 2013-09-29
- Published: 2015-03-26
- Granted: 2016-12-13
- Earliest claimed: 2013-09-24
- Assignees: Ningbo Yuchen Enviroclean Tech Co., Ltd.
- Applicants: Ningbo Yuchen Enviroclean Tech Co., Ltd
- Inventors: Zuolin Zhu; JiaBao Zhao; Meng Sun; Zhenji Zhu; Kangfu Gu; Shanqing Sun; Tongxing Xie; Wenhai Wang
- Web page: https://patentgrep.com/patent/US9517435B2

## CPC

- B01D 53/72: Organic compounds not provided for in groups B01D53/48 - B01D53/70, e.g. hydrocarbons
- A61L 9/01: Deodorant compositions {(compositions released by contact with a liquid A61L9/05)}
- A61L 9/014: containing sorbent material, e.g. activated carbon
- A62D 3/00: Processes for making harmful chemical substances harmless or less harmful, by effecting a chemical change in the substances (consuming noxious gases by combustion F23G7/06)
- B01D 53/02: by adsorption, e.g. preparative gas chromatography {(solid sorbent compositions B01J20/00, preparation of inorganic compounds or elements C01)}
- B01D 53/77: Liquid phase processes
- B01D 53/78: with gas-liquid contact
- B01D 53/82: with stationary reactants
- B01D 2251/70: Organic acids
- B01D 2251/80: Organic bases or salts
- B01D 2252/20494: Amino acids, their salts or derivatives
- B01D 2253/20: Organic adsorbents
- B01D 2257/708: Volatile organic compounds V.O.C.'s
- B01D 2257/93: Toxic compounds not provided for in groups B01D2257/00 - B01D2257/708
- B01D 2258/06: Polluted air
- B01D 2259/4508: for cleaning air in buildings
- 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)
- 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)
- A62D: CHEMICAL MEANS FOR EXTINGUISHING FIRES OR FOR COMBATING OR PROTECTING AGAINST HARMFUL CHEMICAL AGENTS; CHEMICAL MATERIALS FOR USE IN BREATHING APPARATUS

## Abstract

The present invention discloses a formaldehyde absorbent and a method for using the same, the chemical composition of the formaldehyde absorbent by weight percentage is, amino acid: 0.1-99.9%; DNA and RNA base 99.9-0.1%. The method comprises the following steps: a. dissolving the formaldehyde absorbent in solvent to form a solution or dissolving the formaldehyde absorbent in solvent and mixing the same onto a solid carrier; b. placing the solution or solid carrier in indoor space that contains formaldehyde; and c. contacting and reacting the formaldehyde-containing air with the solution or the solid carrier and then absorbing the same. The present invention not only achieves not only excellent performance in absorbing hazard gases in the air, but also features low-cost, and further causes no secondary pollution, which therefore creates great social and economical significance in improving quality of human life, safeguarding human health, and protecting environment.

## Claims

### Claim 1

A formaldehyde absorbent, comprising:
0.1-99.9 wt % of an amino acid;
99.9-0.1 wt % of a DNA or RNA base; and
0.1-10% water-soluble inorganic salt.

### Claim 2 (depends on 1)

The formaldehyde absorbent according to claim 1, wherein the amino acid is selected from the group consisting of alanine, valine, leucine, isoleucine, proline, phenylalanine, tryptophan, methionine, glycine, serine, threonine, tyrosine, cysteine, asparagine, glutamine, arginine, histidine, aspartic acid, glutamic acid and a combination thereof.

### Claim 3 (depends on 1)

The formaldehyde absorbent according to claim 1, wherein the DNA or RNA base is selected from the group consisting of adenine, guanine, cytosine, thymine, uracil and a combination thereof.

### Claim 4 (depends on 1)

The formaldehyde absorbent according to claim 1, wherein the amino acid is a kind of amino acid metal salts, the amino acid metal salts include alkali metal salts, alkaline earth metal salts and transition metal salts.

### Claim 5 (depends on 4)

The formaldehyde absorbent according to claim 4, wherein the alkali metal salts are lithium salt, sodium salt, potassium salt, rubidium salt or cesium salt, the alkaline earth metal salts are beryllium salt, magnesium salt, calcium salt, strontium or barium salt, the transition metal salts are ferric salt and zinc salt.

### Claim 6 (depends on 1)

The formaldehyde absorbent according to claim 1, wherein the water-soluble inorganic salt is Silicon, oxygen, aluminum composition, or silicon, oxygen, sodium composition, or silicon, oxygen, potassium composition, or silicon, oxygen, aluminum, sodium composition, or silicon, oxygen, aluminum, potassium composition, or oxygen, silicon, potassium, sodium composition.

### Claim 7 (depends on 1)

The formaldehyde absorbent according to claim 1, wherein a pH value of the formaldehyde absorbent is from 7.5 to 12.5.

### Claim 8 (depends on 7)

The formaldehyde absorbent according to claim 7, wherein a pH value of the formaldehyde absorbent is from 9 to 11.

### Claim 9 (depends on 1)

The formaldehyde absorbent according to claim 1, wherein the formaldehyde absorbent further comprises an additive, and the additive includes essence, pigment and antiseptic.

### Claim 10 (depends on 1)

A method of absorbing formaldehyde using a formaldehyde absorbent according to claim 1, comprising:
a. obtaining a solution by dissolving the formaldehyde absorbent in a solvent or obtaining a solid by dissolving the formaldehyde absorbent in a solvent to form a second solution and then mixing the second solution onto a solid carrier;
b. placing the solution or the solid in an indoor space that contains formaldehyde; and
c. contacting and reacting formaldehyde-containing air with the solution or the solid.

### Claim 11 (depends on 10)

The method according to claim 10, wherein the solvent comprises water and protic solvent.

### Claim 12 (depends on 11)

The method according to claim 11, wherein the protic solvent comprises at least one selected from the group consisting of glycerol, glycerol derivative and ionic liquid.

### Claim 13 (depends on 10)

The method according to claim 10, wherein the solid carrier includes cloth or cotton paper.

### Claim 14 (depends on 10)

The method according to claim 10, wherein the solution in step b is contained in a container and stirred constantly.