Absorption Agent Phase Separation for Acidic Compound Recovery
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Solution Overview
Problem
Existing absorption agents require high energy for desorption of acidic compounds, especially when carbon dioxide is present at low partial pressures, and lack a guiding principle for component selection and blending ratios to achieve phase separation and efficient recovery.
Innovation Solution
An absorption agent comprising water, an amine compound, and an organic solvent, where the difference in solubility parameters between the organic solvent and the amine compound ranges from 1.1 to 4.2 (cal/cm3)1/2, allowing for efficient absorption and phase separation, thereby reducing the energy required for acidic compound recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an absorption agent containing water, a tertiary amine, and an organic solvent is used to separate carbon dioxide from a mixed gas at low partial pressure, then the absorption efficiency is improved, but the energy required for desorption of carbon dioxide increases
Solution Approach 1:
The absorption agent is divided into two phases: a first phase containing absorbed acidic compounds and a second phase containing unabsorbed absorption agent. This segmentation allows selective heating of only the first phase during desorption, reducing the total energy required while maintaining absorption efficiency
Solution Approach 2:
The solubility parameters of the amine compound and organic solvent are carefully selected to have a specific difference range (1.1 to 4.2 (cal/cm³)¹/²). This parameter control enables phase separation after absorption, facilitating energy-efficient desorption by heating only the concentrated phase
2Use of energy by moving object
If an absorption agent causes phase separation after absorbing acidic compounds, then the energy for regeneration is decreased by heating only the high-concentration phase, but it becomes very difficult to decide the components and blending amounts
Solution Approach 1:
A specific parameter range for the solubility parameter difference between amine compound and organic solvent (1.1 to 4.2 (cal/cm³)¹/²) is established. This quantitative guideline simplifies component selection and formulation while ensuring reliable phase separation and energy-efficient regeneration
Solution Approach 2:
The absorption agent is formulated as a composite system containing water, amine compound, and organic solvent in specific proportions. This composite structure ensures both effective absorption and phase separation properties while providing a systematic approach to manufacturing
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 absorption agent effectively absorbs acidic compounds, phase-separates for efficient recovery, and reduces energy consumption by heating only the high-concentration phase, enhancing absorption efficiency and reducing overall energy needs.
Implementation Method 1
a mixed gas is brought into contact with an absorption agent to absorb an acidic compound into the absorption agent
Implementation Method 2
the absorption agent that has absorbed the acidic compound is phase-separated into a first phase containing the acidic compound in a high content and a second phase containing the acidic compound in a low content
Implementation Method 3
the absorption agent that has absorbed the acidic compound is heated to desorb the acidic compound from the absorption agent
Data Source
AI summary
The absorption agent of the present invention contains water, an amine compound, and an organic solvent, and a value obtained by subtracting a solubility parameter of the organic solvent from a solubility parameter of the amine compound is 1.1 (cal/cm3)1/2 or more and 4.2 (cal/cm3)1/2 or less. The method for separation and recovery of an acidic compound of the present invention includes the steps of: bringing a mixed gas containing an acidic compound into contact with an absorption agent containing water, an amine compound, and an organic solvent to absorb the acidic compound into the absorption agent; causing the absorption agent that has absorbed the acidic compound to be phase-separated into a first phase containing the acidic compound in a high content and a second phase containing the acidic compound in a low content; and heating the first phase to release the acidic compound from the first phase.