Copper Sulphide Sorbent Air Loading to Reduce Self-Heating
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Solution Overview
Problem
Conventional methods for loading copper sulphide sorbents into reaction vessels require an inert atmosphere to prevent self-heating, which is cumbersome and hazardous, and pre-sulphiding steps are inefficient.
Innovation Solution
Loading a particulate copper sulphide sorbent with a D50 average particle size of 5 to 100 μm and an average CuS crystallite size of 25-60 nm in an oxygen-containing atmosphere, eliminating the need for inert gases and reducing self-heating risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If copper sulphide sorbent is loaded in an inert atmosphere, then self-heating is prevented, but operational complexity and safety hazards increase due to required breathing apparatus and inert gas supply
Solution Approach 1:
The patent changes the particle size parameter of copper sulphide sorbent to D50 ≥ 5 μm, which fundamentally alters the material's reactivity characteristics. This parameter change suppresses the oxidation reaction rate with atmospheric oxygen and moisture, eliminating self-heating risks and enabling safe loading in air without inert gas protection
Solution Approach 2:
The patent extracts and eliminates the requirement for inert gas atmosphere from the loading process. By modifying the sorbent particle size, the harmful oxidation reaction is suppressed enough to allow loading in ordinary air, thereby removing the complex safety infrastructure (breathing apparatus, inert gas supply systems) that was previously necessary
2Reliability
If pre-sulphided sorbent is used, then sorbent effectiveness is maintained, but loading safety deteriorates due to self-heating risks in oxygen-containing atmospheres
Solution Approach 1:
The patent applies parameter changes by specifying D50 particle size ≥ 5 μm for copper sulphide sorbent. This particle size parameter suppresses the oxidation reaction kinetics with atmospheric oxygen and moisture, eliminating self-heating hazards while preserving the sorbent's mercury capture effectiveness in oxygen-containing loading environments
3Object-affected harmful factors
If copper sulphide crystallite size is increased to suppress oxidation reactions, then loading safety improves, but sorbent surface area and reactivity may be reduced
Solution Approach 1:
The patent applies segmentation by using larger D50 particle sizes (≥ 5 μm) that contain larger CuS crystallites. This segmentation approach reduces the total surface area exposed to oxygen and moisture, suppressing oxidation reactions and self-heating, while the patent maintains sorbent effectiveness through this optimized particle size distribution
Solution Approach 2:
The patent changes the particle size parameter to D50 ≥ 5 μm, which optimizes the balance between safety and reactivity. This parameter change suppresses harmful oxidation reactions while the patent demonstrates that effective mercury capture is maintained at this particle size
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
Enables safe and efficient loading of copper sulphide sorbents in reaction vessels without inert gas, reducing operational hazards and simplifying the process.
Implementation Method 1
The reaction for capturing mercury using a copper sulphide sorbent may be depicted as follows: 2 CuS+Hg→Cu2S+HgS
Implementation Method 2
the copper (II) sulphide, even under ambient conditions, can react with oxygen and moisture to form copper sulphites and sulphates. This reduces the effectiveness of the sorbent and can lead to potentially hazardous self-heating during loading of the copper sulphide sorbent into the reaction vessel
Data Source
AI summary
A method is described for loading a sorbent material, comprising the step of forming a bed of a particulate copper sulphide sorbent in a reaction vessel in an atmosphere containing oxygen, wherein the particulate copper sulphide sorbent comprises greater than 5% by weight of copper sulphide powder having a D50 average particle size in the range of 5 to 100 μm and having an average CuS crystallite size, as determined by XRD, in the range 25-60 nm.