Copper Catalyst Desulfurization for Corrosion-Free H2S Removal
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for desulfurizing petrochemical gases, such as natural gas, face challenges including high processing costs, corrosion issues, limited selectivity, and by-product generation, particularly in removing hydrogen sulfide (H2S), which can cause corrosion and damage to equipment.
Innovation Solution
A method involving an aqueous suspension of a solid catalyst with a copper salt impregnated on a support, where the catalyst comprises more than 90 wt.% copper, is used to reduce H2S content in gas mixtures, with the catalyst being passed through a three-phase system to achieve efficient desulfurization under ambient conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adsorption by amine solutions is used for H2S removal, then H2S can be removed from natural gas, but corrosion problems occur due to amine-based solutions
Solution Approach 1:
The patent employs a heterogeneous catalyst system comprising copper-based compounds supported on alumina or other supports. This catalyst can be easily replaced when deactivated, avoiding the corrosion issues associated with amine solutions while maintaining effective H2S removal. The solid catalyst does not suffer from the corrosion problems that plague liquid amine systems.
Solution Approach 2:
The invention changes the chemical nature of the desulfurization agent from liquid amine solutions to solid copper-based catalysts. This parameter change eliminates the corrosion issue while maintaining H2S removal capability through catalytic oxidation or adsorption mechanisms.
2Reliability
If conventional desulfurization methods are used, then H2S removal is achieved, but processing costs are high
Solution Approach 1:
The patent uses inexpensive copper-based catalysts supported on alumina or other common supports. These materials are far cheaper than the specialized amine solutions or complex catalytic systems used in conventional methods, significantly reducing processing costs while maintaining effective H2S removal.
Solution Approach 2:
By changing from liquid amine systems to solid copper-based catalysts, the invention eliminates the need for expensive solvent recovery and regeneration equipment, simplifying the process and reducing capital and operating costs.
3Reliability
If adsorption on carbonaceous or metal oxide adsorbents is used, then H2S can be removed, but selectivity is limited and by-products are generated
Solution Approach 1:
The patent employs copper-based catalysts with specific crystal structures and surface properties that provide high selectivity for H2S. The copper sites are specifically tuned to oxidize or adsorb H2S while leaving other gas components unchanged, avoiding the non-selective adsorption of carbonaceous materials and the by-product generation associated with conventional methods.
Solution Approach 2:
The invention changes the mechanism from non-selective physical adsorption to selective catalytic oxidation or chemisorption using copper-based materials. This parameter change enables high selectivity for H2S removal without generating significant by-products, as the copper catalyst specifically targets H2S molecules.
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 effectively reduces H2S content by up to 99.9% within 220 minutes at temperatures between 15 to 40°C and pressures of 0.9 to 1.2 bar, offering a more efficient and cost-effective solution compared to existing technologies.
Implementation Method 1
passing the gas mixture, comprising H2S and a hydrocarbon, through an aqueous suspension of a solid catalyst comprising a copper salt impregnated on a support
Data Source
AI summary
A two or particularly three-phase process, and corresponding apparatus, desulfurizes sour hydrocarbon gas, e.g., natural gas, generally better than known, using a fixed-bed, two-phase processes in terms of the amount of H2S scavenged and the breakthrough time of H2S. The three-phase process is effective in scavenging H2S at ambient temperature and pressure, using a copper salt catalyst impregnated on alumina or other generally inert support, which is regenerable.