Non-hydraulic Cement Composition for Subterranean CO2 Sequestration
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Solution Overview
Problem
Conventional hydraulic Portland cement production is energy-intensive and contributes significantly to carbon emissions, posing environmental and resource concerns.
Innovation Solution
A method of producing cementitious material by combining a reaction mixture comprising a mineral mixture, an organic compound, and CO2 to form a slurry, which is then cured to reduce carbon emissions and sequester CO2 within the cured cement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional hydraulic Portland cement is produced through sintering of limestone and aluminosilicates, then cement with required bonding strength and resistance properties is obtained, but carbon emissions increase significantly and energy consumption becomes prohibitive
Solution Approach 1:
The patent converts carbon dioxide, previously a harmful emission, into a beneficial component of the cement. By reacting CO2 with calcium salts to form calcium carbonate cementitious material, the process sequesters carbon emissions within the cured cement itself, transforming a pollutant into a structural component that provides bonding strength and resistance properties
Solution Approach 2:
The invention fundamentally changes the chemical composition parameters of the cement by replacing traditional clinker-based hydraulic cement with calcium carbonate-based cementitious material formed through CO2 reaction with calcium salts. This parameter change eliminates the need for high-temperature sintering while achieving the required mechanical properties through a different chemical pathway
2Ease of operation
If conventional cement production uses significant quantities of fresh water to form slurry, then cement with required workability is obtained, but water usage becomes prohibitive in many environments
Solution Approach 1:
The patent changes the chemical composition parameters of the cementitious material by using calcium carbonate formed through CO2 reaction with calcium salts, which inherently provides the necessary workability and bonding properties without requiring the same water quantities as conventional Portland cement
3Strength
If the sintering process is conducted at over 1400° C. to form clinker phases, then cement with required mechanical properties is produced, but energy consumption becomes excessive
Solution Approach 1:
The patent eliminates the energy-intensive sintering process by using a chemical reaction pathway where CO2 reacts with calcium salts to form calcium carbonate cementitious material. This approach achieves the required resistance to shattering and mechanical properties through low-temperature chemical synthesis rather than high-temperature thermal processing
Solution Approach 2:
The invention replaces the thermal-mechanical sintering process with a chemical reaction process. Instead of using high-temperature heat to form clinker phases, the patent uses chemical reactions between CO2 and calcium salts to precipitate calcium carbonate, which then cures to form the required mechanical structure
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
This approach minimizes carbon emissions by incorporating CO2 into the cementitious material, reducing the environmental impact of cement production while maintaining the necessary bonding and resistance properties.
Implementation Method 1
combining a reaction mixture to form a slurry and curing the slurry to form the cementitious material. The reaction mixture may comprise a calcium salt, an organic compound, and CO2
Data Source
AI summary
A method of producing a cementitious material includes combining a reaction mixture to form a slurry and curing the slurry to form the cementitious material. The reaction mixture may include a mineral mixture, an organic compound, and CO2. The mineral mixture may include calcium and the organic compound may be 3,4-dihydroxyphenethylamine, methyl salicylate, or both.