Triamine CO2 Absorbent with Cyclic Carbonate Groups

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Solution Overview

Problem

Current carbon dioxide absorbents, such as amine-based solutions and organic solvents, face challenges including high regeneration energy consumption, low absorption capacity, and equipment costs, with amine-based absorbents forming stable carbamate compounds that are difficult to decompose and organic solvents requiring large equipment due to low absorption capacity at normal pressure.

Innovation Solution

A carbon dioxide absorbent comprising a triamine, a diamine, and a dialkylene glycol dialkyl ether or trialkylene glycol dialkyl ether, which reduces the stability of carbamate compounds, facilitating regeneration and improving absorption capacity and rate, while maintaining high thermal stability and low vapor pressure.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If amine-based absorbents are used to capture carbon dioxide, then carbon dioxide absorption capacity is improved, but regeneration energy consumption increases excessively

Engineering Contradiction:

Improvecarbon dioxide absorption capacityVSAvoidregeneration energy consumption

Core Design Contradiction:

Quantity of substanceVSUse of energy by moving object

Solution Approach 1:

The patent modifies the chemical structure of conventional amine absorbents by introducing cyclic carbonate groups into the amine molecule. This structural parameter change creates carbamate compounds with reduced stability, allowing decomposition at lower temperatures (reducing regeneration energy) while maintaining high carbon dioxide absorption capacity through the preserved amine functional groups.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite amine structure combining cyclic carbonate groups with amine groups in a single molecular framework. This composite structure enables dual functionality: the amine groups provide high carbon dioxide absorption capacity while the cyclic carbonate groups modulate carbamate stability to reduce regeneration energy requirements.

Inventive Principle:

Principle #40Composite materials

2Quantity of substance

If amine-based absorbents are used to capture carbon dioxide, then carbon dioxide absorption capacity is improved, but volatile loss of amine increases

Engineering Contradiction:

Improvecarbon dioxide absorption capacityVSAvoidvolatile loss of amine

Core Design Contradiction:

Quantity of substanceVSLoss of substance

Solution Approach 1:

The patent changes the physical and chemical parameters of the amine absorbent by incorporating cyclic carbonate groups, which increase molecular weight and reduce vapor pressure. This parameter modification decreases amine volatility and volatile losses while maintaining the carbon dioxide reactivity of the amine groups.

Inventive Principle:

Principle #35Parameter changes

3Use of energy by moving object

If organic solvents are used for physical absorption of carbon dioxide, then regeneration energy consumption is reduced, but carbon dioxide absorption capacity decreases

Engineering Contradiction:

Improveregeneration energy consumptionVSAvoidcarbon dioxide absorption capacity

Core Design Contradiction:

Use of energy by moving objectVSQuantity of substance

Solution Approach 1:

The patent develops a composite chemical absorbent that combines features of both physical and chemical absorption systems. The cyclic carbonate-amine structure enables reversible carbamate formation with lower stability than conventional amines, achieving regeneration energies closer to physical solvents while maintaining absorption capacities comparable to traditional amine solutions.

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 absorbent achieves high carbon dioxide absorption capacity and regeneration performance at low temperatures, reducing overall energy consumption and preventing absorbent vapor contamination, with maintained absorption capacity even after repeated cycles.

Implementation Method 1

these amine-based absorbents react with carbon dioxide to easily form stable carbamate compounds, and the carbamate compounds can be decomposed again into carbon dioxide and amine when heat is applied

Methodology Applied

Scientific EffectChemical reaction: Chemical Bonding

Implementation Method 2

A carbon dioxide absorbent comprising a triamine, a diamine and a dialkylene glycol dialkyl ether or trialkylene glycol dialkyl ether, which reduces the stability of carbamate compounds

Methodology Applied

Scientific EffectSolvation: Solvation

Data Source

PatentUS10099172B2Carbon dioxide absorbent comprising triamine

Publication Date: 2018.10.16 CETEK CO LTD

AI summary

The present invention relates to a carbon dioxide absorbent comprising a triamine, a diamine and a dialkylene glycol dialkyl ether or trialkylene glycol dialkyl ether. The carbon dioxide absorbent according to the present invention can improve the carbon dioxide absorption capacity, absorption rate, and regeneration performance thereof simultaneously by using the triamine as a main absorbent, the diamine as a rate enhancer, the dialkylene glycol dialkyl ether or trialkylene glycol dialkyl ether as a fine disproportionation agent and a regeneration promoter.