CO2 Recovery by Condensation and Absorption for Higher Yield
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Solution Overview
Problem
Current methods for recovering carbon dioxide from gas streams are inefficient and economically unfeasible, as they fail to effectively capture uncondensed CO2, leading to low yields and high energy consumption.
Innovation Solution
A two-step method involving initial condensation of CO2-containing gases at pressures above the triple point of CO2, followed by absorption using a solvent like methanol, which recovers CO2-rich liquids and gases, enhancing overall yield and reducing energy requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If only condensation is used for CO2 recovery, then the process is simple, but the recovery yield is low because uncondensed CO2 is not captured
Solution Approach 1:
The CO2 recovery process is divided into two sequential steps: first condensation to separate CO2-rich liquid, then absorption to capture remaining gaseous CO2. This segmentation allows each step to target different phases of CO2, significantly improving overall recovery yield while maintaining clear operational boundaries between steps
Solution Approach 2:
The patent combines two different separation mechanisms (condensation and absorption) into a unified recovery system. The condensation step handles bulk CO2 removal while the absorption step captures residual CO2, creating a complementary hybrid approach that achieves high recovery yields without requiring either step to work alone
2Productivity
If absorption alone is used for CO2 removal, then all CO2 can be captured, but the energy consumption and cost are high
Solution Approach 1:
The condensation step is performed first as a preliminary action to remove the majority of CO2 from the gas stream before absorption. This pre-treatment reduces the CO2 load on the subsequent absorption step, allowing absorption to focus only on capturing residual amounts, thereby significantly reducing the energy and solvent requirements compared to using absorption alone
Solution Approach 2:
The patent applies partial condensation rather than complete condensation, followed by selective absorption. This partial action approach in the first step, combined with targeted absorption in the second step, achieves complete CO2 recovery while avoiding the excessive energy consumption that would result from attempting complete removal through a single high-energy process
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 method significantly increases CO2 recovery yields while making the process more economically viable by utilizing a combination of condensation and absorption steps, achieving higher purity and reducing energy consumption.
Implementation Method 1
cooling the compressed gas obtained in step a; separating the gas obtained in step b, by use of a condensation procedure by which said gas is separated into a CO2-rich liquid (L1) and a CO2-containing gas (G1)
Implementation Method 2
absorbing the gas G1 obtained in step c by means of an absorbing agent, by which the gas G1 is separated into a liquid (L2) and a CO2-poor gas (G2)
Data Source
AI summary
The present invention relates to a method for recovery of carbon dioxide from a gas stream. The method is a two-step method in which carbon dioxide is compressed in the first step, while the residual carbon dioxide is recovered by an absorption process in a subsequent step. The present invention also relates to the use of the method for the recovery of carbon dioxide and a plant for recovery of carbon dioxide.