Hydrogen Sulfide Production via Moderate Temperature Catalysis
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Solution Overview
Problem
Existing methods for producing hydrogen sulfide face challenges such as high temperatures leading to corrosion, high pressures increasing safety risks, incomplete hydrogen conversion, and impurities in the product gas, which affect efficiency and safety.
Innovation Solution
A process involving a solid catalyst, specifically using a Co-Mo catalyst on an aluminum oxide support, reacts gaseous sulfur and hydrogen at moderate temperatures (300-450°C) with an excess of sulfur to achieve nearly complete hydrogen conversion and high purity hydrogen sulfide production, utilizing the reaction heat to evaporate sulfur and maintain low pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the reaction is carried out at elevated temperatures (400-800°C) to achieve complete hydrogen conversion, then the conversion efficiency is improved, but corrosion rates increase and material removal from reactor walls worsens
Solution Approach 1:
The patent changes the temperature parameter from conventional high temperatures (400-800°C) to a moderate temperature range (200-400°C, preferably 250-350°C). This parameter change maintains acceptable hydrogen conversion efficiency while dramatically reducing corrosion rates and material removal from reactor walls, resolving the contradiction between productivity and harmful factors.
2Productivity
If high pressure (4-15 atm) is applied to increase reaction rate, then productivity is improved, but safety risks increase due to larger amounts of toxic H2S escaping in case of leaks
Solution Approach 1:
The patent changes the pressure parameter from high pressure (4-15 atm) to near-atmospheric or slightly elevated pressure (0.5-3 atm). This parameter change maintains adequate reaction rates through optimized catalyst and temperature selection while significantly improving safety by reducing the amount of toxic H2S that could escape in case of leaks.
3Productivity
If a sulfur excess ratio of 4:2 to 1.5:2 (atomic sulfur to atomic hydrogen) is used to drive the reaction forward, then hydrogen conversion is improved, but energy consumption increases due to lack of reaction heat utilization
Solution Approach 1:
The patent converts the exothermic reaction heat, which would otherwise be wasted, into a beneficial resource by using it to evaporate sulfur from the liquid sulfur phase. This creates a self-sustaining thermal cycle where reaction heat drives sulfur evaporation, which then reacts with hydrogen, maintaining productivity while eliminating energy loss.
Solution Approach 2:
The system achieves self-service by using the reaction heat generated in the catalyst bed to directly evaporate sulfur from the liquid sulfur pool. This internal heat utilization eliminates the need for external heating energy, making the process energy-self-sufficient while maintaining high hydrogen conversion.
4Temperature
If a complex apparatus structure with multiple heat exchangers and sulfur circulation systems is used to remove reaction heat, then temperature control is improved, but device complexity increases
Solution Approach 1:
The patent merges the temperature control function and sulfur evaporation function into a single integrated process. The reaction heat removal is combined with sulfur evaporation in the catalyst bed, eliminating the need for separate heat exchangers and sulfur circulation systems, thus simplifying the apparatus while maintaining effective temperature control.
Solution Approach 2:
The system uses its own reaction heat to evaporate sulfur, making the sulfur phase change self-driven without external cooling or heating systems. This self-service mechanism dramatically simplifies the apparatus structure while maintaining precise temperature control through the exothermic reaction itself.
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 process achieves hydrogen sulfide purity of ≥99.5% with low corrosion rates, reduced safety risks due to lower pressures, and energy-efficient production in a simple apparatus structure, ensuring high process reliability.
Implementation Method 1
reacting a reactant mixture containing gaseous sulfur and hydrogen over a solid catalyst
Implementation Method 2
utilizing the reaction heat to evaporate sulfur
Implementation Method 3
the heat of reaction released being removed from the product gas by scrubbing with liquid sulfur
Implementation Method 4
Hydrogen and rising sulfur react in the gas space of the column
Data Source
AI summary
The invention relates to a method and a device for producing hydrogen sulfide H2S by the reaction on a fixed catalyst of a reactant mixture containing gaseous sulfur and hydrogen. The reactant mixture is reacted in a reactor (1) at an absolute pressure from 0.5 bar to 10 bar, a temperature from 300°C to 450°C, and an excess of sulfur. The sulfur excess corresponds to a ratio of excess sulfur to produced H2S of 0.2 kg to 3 kg sulfur per kg of produced H2S.