Polyol Complex Solution for SOx Removal
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Solution Overview
Problem
Current desulfurization methods for flue gas and waste gases containing sulfur, such as wet and dry desulfurization processes, face challenges including high water consumption, secondary pollution, equipment corrosion, low efficiency, high operating costs, and poor desulfurization effects, particularly for removing SO2 and SO3, due to issues like equipment clogging and instability of desulfurization solutions.
Innovation Solution
A polyol complex solution comprising a polyol with more than two hydroxyl groups and an organic acid or organic acid salt is used to absorb SOx, with regeneration methods like heating, vacuum, gas stripping, ultrasonication, or microwave treatment, which enhances stability and reduces solvent loss, allowing for effective recycling and improved desulfurization efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If water washing method is used for desulfurization, then the process is simple to operate, but water consumption is high and secondary pollution is caused
Solution Approach 1:
The patent changes the chemical composition parameters of the absorption medium from water-based to polyol-based (ethylene glycol, diethylene glycol, triethylene glycol, or their mixtures), fundamentally altering the physical and chemical properties to reduce water consumption while maintaining absorption effectiveness
Solution Approach 2:
The patent employs a regenerable polyol absorption system that can be repeatedly used and regenerated, replacing the single-use water washing approach, thereby reducing overall water consumption and waste generation
2Reliability
If limestone and limewater method is used for desulfurization, then desulfurization effect is improved, but solid waste generation increases and equipment clogging occurs
Solution Approach 1:
The patent changes the absorption medium from calcium-based (limestone/limewater) to polyol-based solutions, altering the chemical reaction pathway to prevent solid precipitate formation while maintaining high desulfurization efficiency
Solution Approach 2:
The patent converts the harmful solid waste generation problem into a beneficial liquid-phase absorption process where sulfur oxides are absorbed into the polyol solution without forming solid precipitates, eliminating equipment clogging and solid waste disposal issues
3Reliability
If alkali metal solution method is used for desulfurization, then desulfurization efficiency is improved, but equipment corrosion is dramatically serious
Solution Approach 1:
The patent changes the pH and chemical composition parameters of the absorption medium from highly alkaline (alkali metal solutions) to moderately alkaline polyol-based solutions, reducing the corrosiveness to equipment while maintaining sufficient desulfurization efficiency
Solution Approach 2:
The patent employs polyol-based absorption solutions that are less corrosive than traditional alkali metal solutions, reducing equipment corrosion and maintenance costs while maintaining effective sulfur oxide removal
4Reliability
If ethylene glycol or polyethylene glycol is used for desulfurization, then desulfurization effect is good, but solvent loss occurs during regeneration
Solution Approach 1:
The patent changes the molecular weight and chemical structure parameters by using higher molecular weight polyethylene glycols (PEG-400, PEG-600, PEG-800, PEG-1000) instead of lower molecular weight ethylene glycol, increasing the boiling point and thermal stability to reduce solvent loss during regeneration
Solution Approach 2:
The patent exploits the phase transition properties of polyethylene glycol solutions, utilizing their higher boiling points and lower vapor pressures compared to ethylene glycol, thereby reducing solvent evaporation and loss during the heating regeneration 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
The polyol complex solution effectively absorbs and regenerates SOx, reducing solvent loss and maintaining desulfurization efficiency, with stable operation and low energy consumption, suitable for both low and high sulfur content gases, and producing high-purity sulfur byproducts.
Implementation Method 1
uses a polyol complex solution to absorb SOx from a gas
Implementation Method 2
sulfur dioxide or sulfur trioxide mainly interacts with hydroxyl groups in the molecules of ethylene glycol or polyethylene glycol
Implementation Method 3
regenerated by heating, and the regenerated polyol complex solution is recycled for use
Implementation Method 4
the polyol complex solution with absorbed SOx is regenerated by one or more of a heating method
Implementation Method 5
the polyols will form stable associated substance with organic acids and/or organic acid salts via hydrogen bond
Implementation Method 6
will also form stable polyol esters, thus the polyol complex solution is significantly enhanced in stability
Data Source
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AI summary
A method for removing SOx from gas using a polyol complex solution: mixing a polyol with an organic acid and/ or organic acid salt to form a polyol complex solution; enabling the polyol complex solution to contact gas containing SOx, and absorbing SOx in the gas, x=2/ or 3, and the polyol being an organic compound simultaneously comprising two or more hydroxyls in the same organic molecule in addition to ethanediol and polyethylene glycol.