Fractional Regeneration Absorbent for Gas Deacidizing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current deacidizing methods for gaseous effluents, such as natural gas and combustion fumes, require significant energy for regeneration of absorbent solutions due to high physico-chemical affinity between solvents and acid compounds, leading to increased energy consumption and solvent losses.
Innovation Solution
The method involves using an absorbent solution that forms two separable phases upon acid compound absorption, allowing for selective regeneration of the phase laden with acid compounds, thereby reducing the energy required for regeneration by recycling and reusing the depleted and regenerated fractions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an absorbent solution with high physico-chemical affinity for acid compounds is used, then the absorption efficiency is improved, but the energy consumption for regeneration increases significantly
Solution Approach 1:
The absorbent solution is segmented into two distinct phases: a first phase rich in acid compounds and a second phase poor in acid compounds. This segmentation allows selective regeneration of only the first phase, reducing the energy consumption associated with regenerating the entire absorbent solution while maintaining high absorption efficiency through the second phase.
Solution Approach 2:
The acid compounds are extracted from the absorbent solution by separating them into a distinct first phase. This extraction allows the second phase, which remains poor in acid compounds, to be reused without regeneration, thereby reducing the overall energy consumption for regeneration while maintaining absorption capacity.
2Use of energy by stationary object
If the absorbent solution is easily vaporizable to reduce regeneration energy, then the vaporization heat requirement decreases, but absorbent solution losses by entrainment increase
Solution Approach 1:
The absorbent solution is divided into two phases with different compositions and vaporization characteristics. The first phase, rich in acid compounds, can be more easily vaporized for regeneration with lower energy requirements, while the second phase, poor in acid compounds, has properties that reduce entrainment losses. This segmentation resolves the contradiction between ease of vaporization and loss prevention.
3Reliability
If a large fraction of absorbent solution is vaporized to achieve effective stripping, then the regeneration effectiveness is improved, but the energy consumption increases
Solution Approach 1:
By segmenting the absorbent solution into two phases, only the first phase rich in acid compounds requires vaporization for effective stripping. The second phase poor in acid compounds can be reused without vaporization. This segmentation maintains regeneration effectiveness for the contaminated phase while significantly reducing overall energy consumption by avoiding unnecessary vaporization of the clean phase.
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 decreases energy consumption by regenerating only the phase enriched in acid compounds, optimizing the regeneration process and minimizing solvent losses, thus enhancing the efficiency and cost-effectiveness of the deacidizing process.
Implementation Method 1
The absorbent solution allows the acid compounds present in the gaseous effluent to be absorbed
Implementation Method 2
the absorbent solution being selected for its property to form two separable phases when it absorbs an amount of acid compounds
Implementation Method 3
separating the absorbent solution laden with acid compounds into two fractions: a first absorbent solution fraction depleted in acid compounds and a second absorbent solution fraction enriched in acid compounds
Implementation Method 4
addition of additives allows the solvent efficiency to be optimized... the CO2 absorbed reacts with the alkanolamine present in solution according to a reversible exothermic reaction
Implementation Method 5
Regeneration of the absorbent solution is generally carried out by entrainment by a vaporized gas commonly referred to as stripping gas. The thermal energy required for regeneration is split up in three parts linked with heating of the absorbent solution... and its vaporization heat
Data Source
AI summary
The present invention relates to a method of deacidizing a gaseous effluent, wherein the following stages are carried out:a) contacting the gaseous effluent with an absorbent solution so as to obtain a gaseous effluent depleted in acid compounds and an absorbent solution laden with acid compounds, the absorbent solution being selected for its property to form two separable phases when it absorbs an amount of acid compounds,b) separating the absorbent solution laden with acid compounds into two fractions: a first absorbent solution fraction depleted in acid compounds and a second absorbent solution fraction enriched in acid compounds,c) regenerating the second fraction so as to release part of the acid compounds,d) mixing a predetermined amount of water with the first absorbent solution fraction obtained in stage b) or with the regenerated absorbent solution fraction obtained in stage c), thene) recycling the first absorbent solution fraction and the regenerated absorbent solution as the absorbent solution.