Alkali Hydroxide Modified Bitumen for CO2 Trapping
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Solution Overview
Problem
Current bituminous compositions struggle to sustainably trap CO2, as trapped CO2 tends to be released over time, posing a challenge in long-term storage and reducing their effectiveness in mitigating greenhouse gas emissions.
Innovation Solution
A bituminous composition modified with an alkali hydroxide, where CO2 is incorporated and stabilized, maintaining a stable mass over several hours to days, with the alkali hydroxide reacting with CO2 to form stable reaction products that remain trapped, thereby enhancing long-term CO2 storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If CO2 is trapped in bitumen, then CO2 storage capability is improved, but CO2 stability deteriorates as it tends to be released over time
Solution Approach 1:
The patent modifies the chemical composition parameters of bitumen by incorporating alkali metal hydroxide (NaOH or KOH) at specific concentrations (0.1-5% by mass). This chemical modification creates new reaction products (carbonates and bicarbonates) that stabilize CO2 within the bituminous matrix, preventing its release over time while maintaining storage capacity.
Solution Approach 2:
The patent creates a composite bituminous material combining bitumen base with alkali metal hydroxide and CO2 reaction products. This composite structure integrates the trapping capability of bitumen with the stabilizing effect of alkali metal carbonates, achieving both high CO2 storage capacity and long-term stability through material composition.
2Reliability
If alkali metal hydroxide is incorporated into bitumen, then CO2 trapping stability is improved, but manufacturing complexity increases
Solution Approach 1:
The patent incorporates alkali metal hydroxide into the bitumen matrix before CO2 trapping occurs. This preliminary modification of the bituminous composition creates a pre-conditioned matrix that is ready to stabilize CO2 upon contact, simplifying the overall process by avoiding the need for complex post-trapping stabilization steps.
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 effectively stabilizes CO2 within the bituminous composition, reducing emissions and maintaining the composition's stability and performance in roadway and industrial applications, without altering its ageing resistance properties.
Implementation Method 1
the alkali hydroxide reacting with CO2 to form stable reaction products that remain trapped
Implementation Method 2
CO2 is trapped in said bituminous composition and represents from 0.5 to 5% by mass of the mass of the bitumen base
Data Source
AI summary
The present invention concerns a bituminous composition comprising a bitumen base modified by the incorporation of an alkali hydroxide, characterized in that CO2 is trapped in said bituminous composition and represents from 0.5 to 5% by mass, preferably from 0.5 to 4% by mass, and preferentially from 0.5 to 3% by mass, even more preferably from 0.5 to 2% or from 0.5 to 1.5% or from 0.7 to 2% by mass of the mass of the bitumen base and the mass of the bituminous composition is stable at 25° C. and under 1013.25 hPa, over a period Ps of at least 10 hours, preferably at least 15 hours. The invention also concerns a method for the preparation of such compositions and their uses, in particular for the manufacture of mixes or asphalts.