Aqueous Dispersion Composition for CO2 Removal With Methane Retention

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Solution Overview

Problem

Existing methods for removing carbon dioxide from natural gas do not adequately address the decrease in hydrocarbon content, particularly methane, during the carbon dioxide removal process.

Innovation Solution

An aqueous dispersion containing magnesium hydroxide, acetonitrile, and metal hydroxides such as barium hydroxide, zinc hydroxide, sodium hydroxide, and calcium hydroxide is used to react with carbon dioxide in natural gas, maintaining the hydrocarbon content by adjusting the treatment speed and absorption efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If carbon dioxide removal is performed using conventional methods, then carbon dioxide is removed from natural gas, but the hydrocarbon content (particularly methane) decreases significantly

Engineering Contradiction:

Improvecarbon dioxide removal efficiencyVSAvoidhydrocarbon content loss

Core Design Contradiction:

Quantity of substanceVSLoss of substance

Solution Approach 1:

The patent changes the chemical parameters of the absorption system by using a specific aqueous dispersion containing magnesium hydroxide and acetonitrile. This parameter change allows selective absorption of carbon dioxide while preserving hydrocarbons, resolving the contradiction between removal efficiency and substance loss.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent introduces an intermediary substance (aqueous dispersion containing magnesium hydroxide and acetonitrile) that mediates between carbon dioxide and the natural gas mixture. This intermediary selectively absorbs carbon dioxide through chemical reaction while leaving hydrocarbons unaffected, thus preventing their loss.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If treatment speed is increased to improve productivity, then carbon dioxide removal rate increases, but hydrocarbon content decreases more rapidly

Engineering Contradiction:

Improvecarbon dioxide removal rateVSAvoidhydrocarbon content loss

Core Design Contradiction:

ProductivityVSLoss of substance

Solution Approach 1:

The patent establishes a feedback mechanism where the treatment speed is controlled based on the interaction between the aqueous dispersion and natural gas. The system maintains optimal contact conditions that allow high carbon dioxide removal efficiency while preventing excessive treatment speed that would cause hydrocarbon loss.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent makes the treatment process dynamic by adjusting the contact time and flow rates between the aqueous dispersion and natural gas. This dynamic control allows the system to operate at high productivity for carbon dioxide removal while maintaining hydrocarbon content through optimized process conditions.

Inventive Principle:

Principle #15Dynamics

3Reliability

If absorption efficiency is increased to remove more carbon dioxide, then treatment effectiveness improves, but the decrease in hydrocarbon content accelerates

Engineering Contradiction:

Improvecarbon dioxide removal effectivenessVSAvoidhydrocarbon content decrease

Core Design Contradiction:

ReliabilityVSLoss of substance

Solution Approach 1:

The patent changes the chemical composition parameters of the absorption medium by formulating a specific aqueous dispersion containing magnesium hydroxide and acetonitrile. This parameter change enables high absorption efficiency for carbon dioxide while maintaining selectivity that prevents hydrocarbon absorption, thus improving reliability without accelerating substance loss.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses the aqueous dispersion as an intermediary that provides selective absorption characteristics. The dispersion acts as a mediator that absorbs carbon dioxide effectively through chemical reaction while being inert toward hydrocarbons, thereby improving removal effectiveness without causing hydrocarbon loss.

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 method effectively removes carbon dioxide while minimizing the decrease in hydrocarbon content, particularly methane, and allows for the recovery of valuable by-products like magnesium carbonate and graphene.

Implementation Method 1

making the magnesium hydroxide and the carbon dioxide react with each other

Methodology Applied

Scientific EffectChemical reaction: Chemical Bonding

Implementation Method 2

a chemical absorption method using an absorbent solution

Methodology Applied

Scientific EffectChemical absorption: Absorption (physical)

Data Source

PatentUS12516261B2Method for treating carbon dioxide contained in natural gas and aqueous dispersion used therein

Publication Date: 2026.01.06 JONQUIL CONSULTING

AI summary

There is provided with a carbon dioxide treating method capable of suppressing a decrease in the content of a hydrocarbon contained in natural gas before and after removal of carbon dioxide. A method for treating carbon dioxide contained in natural gas comprises: preparing an aqueous dispersion containing magnesium hydroxide and acetonitrile; bringing the aqueous dispersion and the natural gas into contact with each other; and making the magnesium hydroxide and the carbon dioxide react with each other, wherein the aqueous dispersion further contains metal hydroxides, and the metal hydroxides include barium hydroxide, zinc hydroxide, sodium hydroxide, and calcium hydroxide.