Imidazoline Amine Oxide Flue Gas Agent for Recyclable Acidification
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Solution Overview
Problem
Existing desulfurization and denitrification methods are limited in applicability, costly, energy-intensive, cause secondary pollution, and result in rapid acid-rock reactions with short action distances, leading to corrosion and low efficiency in treating flue gas and reservoir acidification.
Innovation Solution
A desulfurization and denitrification agent based on imidazoline amine oxide, specifically [MiO2][BF4]2 or [MsO2][BF4]2, is used for two-stage flue gas treatment and waste liquid recycling, with liquid nitrogen slugs for wellbore cooling and reservoir acidification, forming stable coordination compounds to inhibit corrosion and enhance reaction distance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional desulfurization and denitrification methods (SCR, SNCR, SCO, alkali absorption) are used, then flue gas can be treated, but they require high reaction temperatures, expensive catalysts/oxidizing agents, cause secondary pollution, or are limited in applicability
Solution Approach 1:
The patent changes the chemical parameters by using imidazoline amine oxide instead of conventional catalysts or oxidizing agents, enabling desulfurization and denitrification at lower temperatures without expensive materials while expanding applicability to various flue gas compositions
Solution Approach 2:
The patent employs a composite approach by combining imidazoline amine oxide with specific structural features (two quaternary ammonium nitrogen atoms and tetrafluoroborate) to create a multifunctional agent that simultaneously achieves desulfurization, denitrification, and corrosion resistance
2Ease of manufacture
If desulfurization and denitrification product is used for reservoir acidification, then cost is reduced and production is augmented, but the product will be hydrolyzed at high temperature in tubing string to corrode the tubing string
Solution Approach 1:
The patent introduces liquid nitrogen as an intermediary cooling medium between the desulfurization-denitrification product and the tubing string. The liquid nitrogen slug creates a thermal barrier that prevents high-temperature hydrolysis of the product, eliminating corrosion while maintaining the cost benefits of using the product for acidification
Solution Approach 2:
The patent applies preliminary cooling action by injecting liquid nitrogen before the desulfurization-denitrification product enters the tubing string. This pre-cooling prevents the thermal conditions that would cause hydrolysis and corrosion, solving the problem before it occurs
3Productivity
If conventional acid fracturing is used, then reservoir acidification can be performed, but the acid-rock reaction rate is too fast, action distance is short, and it is difficult for acid to enter reservoir with low permeability
Solution Approach 1:
The patent changes the reaction kinetics parameters by using the desulfurization-denitrification product as acidifying agent. The product provides controlled, slower acid-rock reaction rates that extend the action distance and enable penetration into low-permeability reservoir zones, while maintaining effective blockage removal
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 imidazoline amine oxide agent effectively reduces costs and energy consumption, minimizes secondary pollution, and enhances desulfurization and denitrification rates while providing safe and efficient reservoir acidification with improved reaction distance and corrosion inhibition.
Implementation Method 1
The desulfurization and denitrification agent oxidizes NOx and SOx into HNO3 and H2SO4, and meanwhile, it is reduced to [Mi][BF4]2 or [Ms][BF4]2
Implementation Method 2
At the reservoir temperature, the nitrate and the sulfate in the waste liquid is slowly hydrolyzed into HNO3 and H2SO4
Implementation Method 3
injecting liquid nitrogen into a target layer as a slug 1 for cooling a wellbore and an immediate vicinity of wellbore
Data Source
AI summary
A desulfurization and denitrification agent and application thereof are provided, belonging to the fields of flue gas purification and purified product recycling. In the present disclosure, an imidazoline amine oxide is used as a desulfurization and denitrification agent, which can oxidize NOx and SOx into HNO3 and H2SO4. Meanwhile, after the agent is reduced, double bonded tertiary nitrogen atoms in the agent can be used as a base for neutralizing H2SO4 and HNO3. In addition, in the present disclosure, the imidazoline amine oxide is used as the desulfurization and denitrification agent for two-stage desulfurization and denitrification of flue gas. Waste liquid produced after the reaction is injected as foaming acid liquid into carbonate and tight sandstone reservoirs, and slowly hydrolyzed into H2SO4, HNO3, and HF at the reservoir temperature, and the produced acid reacts with the reservoirs to augment production and injection of the reservoirs.