Nitrogen Oxide Purification Composition Using Chelating Organic Acids

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Solution Overview

Problem

Current denitration methods, such as the scrubber method, are inefficient in purifying nitrogen-oxide-containing gases, leading to residual pollutants in treated effluents, and electrochemical methods produce explosive ammonium nitrate wastewater.

Innovation Solution

A composition comprising an alkaline substance and an organic acid with chelating groups, such as cyclopentane, cyclohexane, or phenanthrene compounds, is used to reduce nitrogen-oxide-containing gases, converting them into environmentally friendly substances like nitrogen gas, with a device incorporating a conversion module and purification tank.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If the scrubber method is used for denitration, then the treatment cost is low and market utilization rate is high, but nitrogen-oxide-containing gases are still present in treated effluents

Engineering Contradiction:

Improvetreatment costVSAvoidresidual nitrogen-oxide pollutants

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

The patent uses a composite absorption liquid containing both alkaline substances (for bulk NOx absorption) and organic acids with chelating groups (for selective binding and conversion of nitrogen oxides). This composite system combines the cost-effectiveness of alkaline scrubbing with the enhanced purification capability of chelating agents, achieving both low cost and high removal efficiency.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent optimizes the pH range (5-14) and composition ratios of the absorption liquid to maximize nitrogen oxide removal. By adjusting these parameters, the system achieves complete neutralization of nitrogen oxides while maintaining cost-effectiveness and avoiding the formation of harmful byproducts.

Inventive Principle:

Principle #35Parameter changes

2Productivity

If the electrochemical method is used for denitration, then the reaction between nitrogen-oxide-containing gases and ammonia or urea occurs, but ammonium nitrate-containing explosive wastewater is produced

Engineering Contradiction:

Improvedenitration reaction efficiencyVSAvoidexplosive ammonium nitrate wastewater

Core Design Contradiction:

ProductivityVSObject-generated harmful factors

Solution Approach 1:

The patent converts the harmful nitrogen oxides into beneficial nitrogen gas through the chelating action of organic acids. The organic acid groups form stable complexes with nitrogen oxides, facilitating their reduction to harmless N2 gas rather than forming explosive ammonium nitrate, thus converting a potentially harmful process into a safe one.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The organic acid with chelating groups acts as an intermediary substance that mediates between nitrogen oxides and the reduction process. It binds to nitrogen oxides first, then facilitates their conversion to nitrogen gas, preventing the direct formation of explosive ammonium nitrate while maintaining high reaction efficiency.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Device complexity

If conventional purification methods are used, then the process is simple, but the purification rate of nitrogen dioxide is insufficient

Engineering Contradiction:

Improvepurification process complexityVSAvoidnitrogen dioxide purification rate

Core Design Contradiction:

Device complexityVSObject-affected harmful factors

Solution Approach 1:

The patent employs a composite absorption liquid combining alkaline substances and organic acids with chelating groups. This composite formulation achieves up to 100% purification rate of nitrogen dioxide while maintaining a relatively simple device structure, effectively resolving the contradiction between simplicity and efficiency.

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 solution achieves high purification rates of nitrogen dioxide, up to 100%, while reducing environmental pollution and health risks, with the alkaline and organic acid combination effectively adjusting pH and oxidation-reduction potential to enhance the purification process.

Implementation Method 1

at least one organic acid having a group which can be chelated with nitrogen-oxide-containing substances

Methodology Applied

Scientific EffectChelation:

Implementation Method 2

the alkaline and organic acid combination effectively adjusting pH and oxidation-reduction potential to enhance the purification process

Methodology Applied

Scientific EffectpH adjustment:

Implementation Method 3

The nitrogen-oxide-containing gases can be purified by the composition to produce nitrogen (N2) gas or another environmentally friendly substance

Methodology Applied

Scientific EffectReduction: Reduction

Data Source

PatentUS10252215B2Composition and apparatus for purifying nitrogen-oxide-containing gases

Publication Date: 2019.04.09 IND TECH RES INST

AI summary

A composition and a device for purification of nitrogen-oxide-containing gas is provided. It can purify harmful nitrogen-oxide-containing gases, such as nitric oxide or nitrogen dioxide. The composition includes an alkaline substance and at least one organic acid, the organic acids having an enediol group, enediamine group, or amine group of cyclopentane compounds, cyclohexane compounds, cycloheptane compounds, or phenanthrene compounds.