Lignin Bioash Concrete for Carbon Sequestration
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Solution Overview
Problem
The cement manufacturing process is a significant source of carbon dioxide emissions, primarily due to the conversion of limestone to calcium oxide at high temperatures, necessitating a reduction in carbon footprint for concrete production.
Innovation Solution
The method involves treating lignin deacetylation byproducts, such as black liquor bioash or activated lignin carbon, by heating them to form a lignin product, which is then combined with aggregates and binders to create a sustainable concrete alternative, reducing the need for ordinary portland cement and lowering carbon emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If ordinary portland cement is used for concrete production, then the concrete achieves required strength, but carbon dioxide emissions increase significantly
Solution Approach 1:
The patent changes the chemical composition parameters of cement by incorporating lignin deacetylation byproducts (black liquor) containing calcium carbonate and other minerals. This substitution modifies the cement's chemical makeup to reduce reliance on traditional OPC while maintaining strength through pozzolanic reactions and carbonation processes.
Solution Approach 2:
The patent converts the harmful CO2 emissions into a beneficial process by utilizing the carbonation of calcium carbonate present in the black liquor byproduct. The CO2 that would normally be emitted is instead sequestered through carbonation reactions, forming calcium carbonate precipitates that contribute to concrete strength while reducing the carbon footprint.
2Productivity
If limestone is converted to calcium oxide at high temperatures, then cement production proceeds, but carbon dioxide is released as a byproduct
Solution Approach 1:
The patent recovers and utilizes the carbonation byproduct (CO2) generated during cement production. Instead of discarding CO2 as waste, the process captures it through the carbonation of calcium carbonate in the black liquor byproduct, converting a harmful emission into a useful strengthening mechanism for concrete.
Solution Approach 2:
The black liquor byproduct serves multiple functions: it acts as a source of calcium carbonate for carbonation reactions, provides pozzolanic materials for strength development, and serves as a carbon sink for sequestering CO2 emissions. This multi-functionality allows simultaneous achievement of productivity and emission reduction.
3Object-generated harmful factors
If lignin deacetylation byproducts are used to replace ordinary portland cement, then carbon emissions are reduced, but the pozzolanic activity and strength may be insufficient
Solution Approach 1:
The patent creates a composite cement system combining lignin deacetylation byproducts (black liquor) with traditional cementitious materials. This composite approach leverages the pozzolanic activity of black liquor components while maintaining the strength-contributing properties of calcium oxide and calcium hydroxide, achieving both emission reduction and adequate strength.
Solution Approach 2:
The patent performs preliminary carbonation of calcium carbonate in the black liquor byproduct before concrete formation. This preliminary action pre-establishes calcium carbonate precipitates that will contribute to strength development, ensuring that the byproduct is adequately prepared to provide both carbon sequestration and mechanical strength in the final concrete product.
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 enhances the pozzolanic activity of the concrete, increasing strength while sequestering additional carbon, thereby reducing the environmental impact of concrete production and offering a lower embodied carbon footprint compared to traditional cementing materials.
Implementation Method 1
enhances the pozzolanic activity of the concrete, increasing strength
Implementation Method 2
sequestering additional carbon
Data Source
AI summary
The utilization of the byproducts from the deacetylation of lignocellulosic biomass from the production of ethanol to create cement additives and/or alternatives to ordinary portland cement (OPC) is described. These byproducts may be used to create black liquor bioash (BLA), activated lignin carbon (ALC), and/or lignin aerogel admixtures. In some embodiments, the byproduct may be combined with at least one binder to form alkali-activated materials (AAMs).