H2S Sequestrant Composition for Wastewater Without Gas Re-Release

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Solution Overview

Problem

Existing methods for removing hydrogen sulfide (H2S) from wastewater face challenges such as foaming, scaling, corrosion, high energy and capital costs, and the generation of secondary hazardous waste, while alternative agents like triazine cause fouling due to dithiazine polymer formation.

Innovation Solution

A composition comprising aminoorganoalkoxysilane-functionalized particles, thickening agents, and an absorption promoter in a polar solvent, which captures H2S without subsequent release into the atmosphere by forming ammonium hydrogen sulfide (NH4SH), using SiO2, Ag, Au, TiO2, ZnO, ZrO2, or Fe3O2 particles, and hydroxyethylcellulose, carboxymethylcellulose, or gum arabic, with (3-aminopropyl)triethoxysilane (APTES) functionalization.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If amines are used as chemical sequestrant agents to remove H2S, then H2S removal efficiency is improved, but foaming, scaling, and corrosion problems occur

Engineering Contradiction:

ImproveH2S removal efficiencyVSAvoidfoaming, scaling, and corrosion

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent introduces amino-organoalkoxysilane-functionalized particles as an intermediary substance that mediates between H2S and the aqueous phase. These functionalized particles provide amino groups for H2S binding while avoiding the direct harmful effects of conventional amines through their particle-supported structure

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The invention uses composite particles consisting of a solid support (such as silica, alumina, or activated carbon) functionalized with amino-organoalkoxysilane groups. This composite structure combines the H2S-binding capability of amines with the stability and reduced side-effects of solid particle supports

Inventive Principle:

Principle #40Composite materials

2Productivity

If a two-stage absorption and regeneration process is used with amines, then H2S removal is achieved, but high energy and capital costs are incurred and secondary hazardous waste is generated

Engineering Contradiction:

ImproveH2S removal capabilityVSAvoidenergy and capital costs

Core Design Contradiction:

ProductivityVSLoss of energy

Solution Approach 1:

The patent extracts the H2S-binding function from the bulk amine solution and concentrates it on the surface of functionalized particles. This allows the H2S removal function to be separated from the regeneration complexity, enabling simpler treatment approaches

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The functionalized particles can be designed for single-use or easy regeneration, allowing the spent particles to be discarded or regenerated without complex distillation processes, thereby reducing energy consumption and avoiding secondary waste streams

Inventive Principle:

Principle #34Discarding and recovering

3Productivity

If triazine is used as H2S scavenger in direct conversion processes, then H2S is converted to elemental sulfur, but fouling occurs due to dithiazine polymer formation

Engineering Contradiction:

ImproveH2S conversion to elemental sulfurVSAvoidfouling due to dithiazine polymer

Core Design Contradiction:

ProductivityVSObject-generated harmful factors

Solution Approach 1:

The functionalized particles can be designed as disposable or easily replaceable components. Once their H2S-binding capacity is exhausted, they can be discarded without causing fouling problems, as the particle structure prevents polymer formation

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Solution Approach 2:

The amino-organoalkoxysilane-functionalized particles act as an intermediary that binds H2S through amino groups without forming the problematic dithiazine polymers that triazine produces, thus mediating the H2S removal process without fouling

Inventive Principle:

Principle #24Intermediary (Mediator)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The composition effectively sequesters H2S in wastewater up to 98% without atmospheric release, addressing the inefficiencies and environmental concerns of previous methods, and reducing health and corrosion risks.

Implementation Method 1

aminoorganoalkoxysilane-functionalized particles... captures H2S without subsequent release into the atmosphere by forming ammonium hydrogen sulfide (NH4SH)

Methodology Applied

Scientific EffectAdsorption: Adsorption

Implementation Method 2

an adsorption promoter between 0.01% w/w and 8% w/w

Methodology Applied

Scientific EffectAbsorption: Absorption (physical)

Data Source

PatentUS20260091998A1H2s sequestering composition

Publication Date: 2026.04.02 C I MULTISERVICIO DE INGENIERIA 1A SA

AI summary

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.