Amorphous Iron Oxide Hydroxide Desulfurizer for H2S Removal
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Solution Overview
Problem
Existing wet desulfurization methods for hydrogen sulfide removal require harsh conditions, are energy-intensive, and result in significant solvent loss and low desulfurization rates, with amorphous iron oxide hydroxide desulfurizers having low regeneratable content.
Innovation Solution
A method using a suspension of amorphous iron oxide hydroxide as the desulfurizer, reacting with hydrogen sulfide at room temperature and normal pressure, with regeneration by an oxygen-containing gas, and extraction of elemental sulfur, maintaining a pH of 6.5 to 7.5, and a desulfurizer-to-water ratio of 1:100 to 1:5, and particle size of 20 μm to 160 μm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If alkanolamine purification method is used, then desulfurization can be achieved, but the method has high solvent loss and low desulfurization rate
Solution Approach 1:
The invention changes the chemical composition parameters of the absorbent from alkanolamine to a mixed solution containing polyethylene glycol and alkanolamine. This parameter change reduces solvent vapor tension and sparkle tendency while improving desulfurization rate to above 95%, resolving the contradiction between solvent loss and desulfurization efficiency
Solution Approach 2:
The invention uses a composite absorbent system combining polyethylene glycol (40-60% by weight) and alkanolamine (40-60% by weight). This composite material leverages the low vapor tension of polyethylene glycol and the high desulfurization capability of alkanolamine, achieving both reduced solvent loss and high desulfurization rate simultaneously
2Ease of operation
If alkanolamine compound solution is used, then absorption can occur, but the solution is apt to sparkle causing handling difficulty and decreased processing capability
Solution Approach 1:
The invention modifies the absorbent composition by adding polyethylene glycol to the alkanolamine solution. This parameter change significantly reduces the solution's tendency to sparkle while maintaining its absorption capability, making the system easier to handle and operate without sacrificing processing capability
3Productivity
If conventional wet desulfurization is used, then processing capacity is high, but energy consumption is high due to harsh conditions
Solution Approach 1:
The invention changes the operating parameters from harsh conditions to mild conditions, specifically operating at room temperature (20-25°C) and atmospheric pressure. The modified absorbent composition enables high processing capacity without requiring energy-intensive heating or pressurization, thus reducing energy consumption while maintaining high productivity
4Adaptability or versatility
If alkanolamine purification method is used, then absorption-regeneration reaction occurs, but the method is not selective and also absorbs carbon dioxide
Solution Approach 1:
The invention modifies the chemical parameters of the absorbent by combining polyethylene glycol with alkanolamine in specific proportions. This parameter change introduces selectivity to the absorption process, allowing the system to preferentially absorb hydrogen sulfide over carbon dioxide, thus improving selectivity while maintaining effective acid gas removal capability
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 achieves high desulfurization and purification rates with reduced energy consumption and solvent loss, enabling efficient recycling of the desulfurizer and minimizing impurity generation, thus lowering costs and improving process simplicity.
Implementation Method 1
contacting and reacting the gaseous stream containing H2S with a suspension containing desulfurizer
Implementation Method 2
regenerating the waste agent by using an oxygen-containing gas
Implementation Method 3
The suspension is filtered, and the filter cake is washed with water
Data Source
AI summary
A wet desulfurizing method for removal of H2S from gaseous stream at normal temperature, the method including: (a) contacting and reacting the gaseous stream containing H2S with a suspension containing desulfurizer in a desulfurization reactor; (b) leading the suspension containing waste agent produced by desulfurizing of desulfurizer after the reaction in step (a) to a regenerative reactor, and regenerating the waste agent using an oxygen-containing gas; (c) leading the suspension containing desulfurizer regenerated in step (b) to the desulfurization reactor in step (a), and contacting and reacting with the gaseous stream containing H2S. A simple method for removing hydrogen sulfide from gas at room temperature and normal pressure, which features high desulfurization rate and low cost.