Chelated Zinc Scavenger Composition for Sulphide Removal

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Solution Overview

Problem

Current scavenger technologies for removing hydrogen sulphide and carbon dioxide from industrial processes face challenges, including precipitation issues that limit their effectiveness and economic viability, especially when sulphur flow is low.

Innovation Solution

A composition comprising a metal, a base, a chelating agent, and water is used to remove sulphur compounds and carbon dioxide from substances, preventing precipitation and maintaining efficacy across varying sulphur flow rates.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a zinc-based scavenger is diluted with water for industrial application, then the scavenger can be applied in various industrial processes, but the zinc component precipitates from solution limiting its effectiveness

Engineering Contradiction:

Improveapplicability in industrial processesVSAvoidscavenging effectiveness

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

A chelating agent is introduced as an intermediary substance that binds to zinc ions in solution, preventing their precipitation while maintaining their scavenging activity. The chelating agent forms stable soluble complexes with zinc, allowing the scavenger to remain effective in diluted aqueous solutions across various industrial applications.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The chemical state of zinc is changed from free ions that precipitate in aqueous solution to chelated complexes that remain soluble. By altering the chemical parameters through chelation, the scavenger maintains its effectiveness across a wider range of dilution levels and industrial conditions.

Inventive Principle:

Principle #35Parameter changes

2Productivity

If regenerative processes are used to remove high daily flows of hydrogen sulphide, then the sulphur contaminants can be separated from process streams, but the process becomes economically unviable when sulphur flow is low

Engineering Contradiction:

Improvesulphur removal capacityVSAvoideconomic viability

Core Design Contradiction:

ProductivityVSEase of manufacture

Solution Approach 1:

The invention employs single-use scavenger compositions that are inexpensive to produce and dispose of. Rather than investing in complex regenerative systems, the method uses affordable scavenger formulations that can be applied, used to remove sulphur contaminants, and then discarded, making the process economically viable even for low sulphur flows.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Solution Approach 2:

The scavenger composition is formulated with optimized concentrations of metal salts, bases, and chelating agents to maximize sulphur removal efficiency per unit of scavenger. This parameter optimization ensures that even small amounts of scavenger are highly effective, reducing the overall cost of the disposable approach.

Inventive Principle:

Principle #35Parameter changes

3Device complexity

If conventional scavengers are used without chelating agents, then the composition is simpler, but the metal component precipitates from solution when diluted

Engineering Contradiction:

Improvecomposition simplicityVSAvoidmetal solubility

Core Design Contradiction:

Device complexityVSStability of the object's composition

Solution Approach 1:

A chelating agent serves as an intermediary that bridges the metal salt and the aqueous solution, preventing precipitation by forming stable soluble complexes. This addition maintains metal solubility and scavenging activity in diluted compositions without significantly complicating the overall formulation.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The scavenger composition is formulated as a composite system combining metal salts, bases, and chelating agents in specific proportions. This composite approach ensures that the metal component remains soluble and active throughout the range of dilutions encountered in industrial applications.

Inventive Principle:

Principle #40Composite materials

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 absorbs and removes hydrogen sulphide and carbon dioxide from gases and liquids, preventing precipitation and ensuring continuous operation without the need for regenerative processes, thus enhancing safety and economic efficiency.

Implementation Method 1

a chelating agent, at between 0.1 to 50 percent by weight of the composition

Methodology Applied

Scientific EffectChelation:

Implementation Method 2

the composition effectively absorbs and removes hydrogen sulphide and carbon dioxide from gases and liquids

Methodology Applied

Scientific EffectAbsorption: Absorption (physical)

Implementation Method 3

Composition and method for chelated scavenging compounds

Methodology Applied

Scientific EffectChelated scavenging:

Data Source

PatentUS7682520B2Composition and method for chelated scavenging compounds

Publication Date: 2010.03.23 CFR PATENTS INC

AI summary

There is disclosed herein a composition and method for removing a sulphur compound or carbon dioxide from a substance and methods for its use, said composition comprising a metal at between about 0.5 to 25 percent by weight, a base at between about 1 to 99 percent by volume, a chelating agent at between about 0.1 to 50 percent by weight and water.