# US 2026/0091998 A1 · H2s sequestering composition

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- Number: US 2026/0091998 A1
- Document ID: US20260091998A1
- Status: Published application
- Kind: A1
- Application number: 19/111,639
- Filed: 2023-09-13
- Published: 2026-04-02
- Earliest claimed: 2022-09-15
- Assignees: C.I Multiservicio De Ingenieria 1A S.A
- Applicants: C.I Multiservicio De Ingenieria 1A S.A
- Inventors: Nilson AHUMADA ANGEL; Carlos Andres HERNANDEZ BARRIOS; Neils LEAL GODOY
- Web page: https://patentgrep.com/patent/US20260091998A1

## CPC

- C02F 1/683: {by addition of complex-forming compounds}
- B01D 53/02: by adsorption, e.g. preparative gas chromatography {(solid sorbent compositions B01J20/00, preparation of inorganic compounds or elements C01)}
- B01D 53/14: by absorption
- B01J 20/103: {comprising silica}
- B01J 20/22: comprising organic material
- B01J 20/28: characterised by their form or physical properties
- B01J 20/28007: {with size in the range 1-100 nanometers, e.g. nanosized particles, nanofibers, nanotubes, nanowires or the like (carbon nanostructures B01J20/205)}
- B01J 20/28016: {Particle form}
- B01J 20/3085: {Chemical treatments not covered by groups B01J20/3007 - B01J20/3078}
- B01J 20/3204: {Inorganic carriers, supports or substrates}
- B01J 20/3217: {Resulting in a chemical bond between the coating or impregnating layer and the carrier, support or substrate, e.g. a covalent bond}
- B01J 20/3246: {having a well defined chemical structure}
- B01J 20/3293: {Coatings on a core, the core being particle or fiber shaped, e.g. encapsulated particles, coated fibers}
- C02F 1/00: Treatment of water, waste water, or sewage (C02F3/00 - C02F9/00 take precedence)
- C02F 1/28: by sorption (using ion-exchange C02F1/42; sorbent compositions B01J)
- C02F 1/281: {using inorganic sorbents}
- C02F 1/52: by flocculation or precipitation of suspended impurities {(C02F1/463 takes precedence)}
- C02F 1/56: Macromolecular compounds
- C02F 1/58: by removing specified dissolved compounds (using ion-exchange C02F1/42; softening water C02F5/00)
- C02F 2101/101: {Sulfur compounds}
- C02F 2305/08: Nanoparticles or nanotubes
- C02F: TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE (separation in general B01D; special arrangements on waterborne vessels of installations for treating water, waste water or sewage, e.g. for producing fresh water, B63J; adding materials to water to prevent corrosion C23F; treating radioactively-contaminated liquids G21F9/04; regeneration of reactants for recirculation into processes, see the relevant places for the processes)
- 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

## Abstract

The present development refers to a H2S sequestrant composition in wastewater comprising°aminoorganoalkoxysilane-functionalized°particles, aminoorganoalkoxysilane-functionalized thickening agents, an adsorption promoter, and a polar solvent. In particular, the developed composition allows the removal of H2S present in wastewater due to the combined reaction of the amino groups on the particles and the aminoorganoalkoxysilane-functionalized thickening agents and the H2S that, in the presence of the absorption promoter, allows the production of ammonium hydrogen sulfide (NH4SH). In addition, the sequestrant composition of the present development maintains the H2S species captured without further release into the atmosphere.

## Claims

### Claim 1

An H2S sequestrant composition comprising:
aminoorganoalkoxysilane-functionalized particles between 1 ppm and 20000 ppm;
aminoorganoalkoxysilane-functionalized thickening agent between 0.01% w/w and 3% w/w;
adsorption promoter between 0.01% w/w and 8% w/w; and
polar solvent.

### Claim 2 (depends on 1)

The H2S sequestrant composition according to claim 1, wherein the particles are selected from the group consisting of SiO2, Ag, Au, TiO2, ZnO, ZrO2, and Fe3O2 particles.

### Claim 3 (depends on 1)

The H2S sequestrant composition according to claim 1, wherein the aminoorganoalkoxysilane-functionalized particles are characterized by an average particle size between 1 nm and 6000 nm.

### Claim 4 (depends on 1)

The H2S sequestrant composition according to claim 1, wherein the thickening agent is selected from hydroxyethylcellulose, carboxymethylcellulose (CMC), carboxyethylcellulose (CEC), carrageenan, guar gum, xanthan gum, gum arabic, carob bean gum, hemicellulose, sodium carboxymethylcellulose, and mixtures thereof.

### Claim 5 (depends on 1)

The H2S sequestrant composition according to claim 1, wherein the aminoorganoalkoxysilanes are selected from (3-aminopropyl)triethoxysilane (APTES), (3-aminopropyl)trimethoxysilane, N-(β-aminoethyl)-γ-aminopropylmethyldimethoxysilane, N-3-trimethoxysilylpropyldiethylenetriamine, and mixtures thereof.

### Claim 6 (depends on 1)

The H2S sequestrant composition according to claim 1, wherein the adsorption promoter is selected from the group consisting of diethanolamine, monoethanolamine, triethanolamine, triethylenetetramine (TETA), diethylenetriamine, tris(2-aminoethyl)amine, ethylenediamine, 1,2-diaminopropane, tetraethylenepentamine, 1-hexadecylamine (HDA), aminoethylpiperazine (AEP), N,N′-bis-(2-aminoethyl)piperazine, N-(2-aminoethyl)piperazine, piperazinoethylenediamine (PEEDA), tetraethylenepentimine, pentaethylenehexamine, putrescine, cadaverine, norspermidine, spermidine, spermine, and mixtures thereof.

### Claim 7 (depends on 1)

The H2S sequestrant composition according to claim 1, wherein the polar solvent is selected from water, ethanol, isopropyl alcohol, methanol, butyl glycol, and mixtures thereof.

### Claim 8 (depends on 1)

The sequestrant composition according to claim 1 comprising:
APTES-functionalized SiO2 particles between 5000 ppm and 20000 ppm;
APTES-functionalized hydroxyethylcellulose between 0.01% w/w and 3% w/w;
triethylenetetramine (TETA) between 0.1% w/w up to 8% w/w; and
water;
wherein the APTES-functionalized SiO2 particles are characterized by an average particle size between 1 nm and 6000 nm.

### Claim 9

A method for obtaining an H2S sequestrant composition comprising the steps of:
a) hydroxylating the particles until at least 90% of the surface has OH— groups;
b) functionalizing the hydroxylated particles and the thickening agent using aminoorganoalkoxysilanes;
d) mixing the functionalized thickening agent, the absorption promoter, and the functionalized particles with the solvent at a temperature between 10° C. and 30° C., under stirring between 400 rpm and 1300 rpm for 2 h to 8 h until obtaining the H2S sequestrant composition in wastewater.