Lobed Adsorbent Geometry for Mercury Capture in Gas Streams
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Solution Overview
Problem
Current methods for removing heavy metals like mercury from industrial gas and liquid hydrocarbon streams face challenges such as limited saturation capacity, high operational costs due to multiple adsorbent beds, and inefficiencies in pressure drop management, which reduce the dynamic capacity and operational period of adsorption processes.
Innovation Solution
A fixed bed process using monolithic or supported extrudates with an active phase containing elemental sulfur or cuprous copper sulphide (CuS) or iron sulphide (FeS2), characterized by a specific geometry with at least three lobes, enhances the dynamic capacity and adsorption efficiency, allowing for longer operational periods and reduced adsorbent volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional adsorbent beds are used for mercury removal, then mercury capture is achieved, but the saturation capacity is limited and operational period is reduced
Solution Approach 1:
The patent changes the physical parameters of the adsorbent by shaping it into specific geometries (spheres with 3-11 lobes, cylinders with 3-11 protrusions, or annular rings with 3-11 protrusions) rather than using conventional uniform shapes. This geometric parameter change increases the dynamic capacity and extends the operational period by optimizing fluid flow distribution and active phase exposure across the adsorbent bed.
Solution Approach 2:
The adsorbent is segmented into multiple lobes or protrusions around a central axis, creating distinct flow channels and active zones. This segmentation allows for more uniform distribution of the effluent across the adsorbent bed, preventing channeling effects and maximizing the utilization of the active phase, thereby increasing saturation capacity and operational period.
2Reliability
If multiple adsorbent beds are used in parallel for regeneration, then continuous operation is maintained, but device complexity and operational costs increase
Solution Approach 1:
The patent enables continuous operation with a single adsorbent bed by optimizing its geometric parameters to prevent premature saturation. The lobed or protruded structure ensures uniform effluent distribution and maximizes active phase utilization, allowing the bed to maintain effective mercury capture for extended periods without requiring parallel beds for regeneration cycles.
3Productivity
If conventional adsorbent geometry is used, then pressure drop is manageable, but dynamic capacity and adsorption efficiency are reduced
Solution Approach 1:
The patent employs curved, lobed, or protruded geometries rather than flat or simple cylindrical shapes. These curved surfaces optimize fluid flow patterns around the adsorbent particles, reducing dead zones and improving contact between the effluent and active phase. This increases dynamic capacity while the overall compact structure maintains acceptable pressure drop characteristics.
4Quantity of substance
If larger volume of adsorbent is used, then saturation capacity increases, but investment costs increase
Solution Approach 1:
The patent achieves higher saturation capacity per unit volume by changing the geometric parameters of the adsorbent to include lobes or protrusions. This increases the effective surface area and active phase exposure within a compact volume, maximizing mercury capture capacity without requiring proportionally larger adsorbent volumes, thereby reducing investment costs.
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 process achieves higher mercury capture efficiency and longer operational periods while minimizing investment costs by utilizing a smaller volume of adsorbent, maintaining adsorption performance beyond thresholds set by prior art methods.
Implementation Method 1
The skilled person will be aware that the capture of mercury may be carried out easily by reacting it with an active phase based on sulphur or a sulphur-containing compound, in particular metallic sulphides, the mercury then forming an amalgam with the sulphur to form the chemical species HgS known as cinnabar or mercuric sulphide
Implementation Method 2
The effluent is thus cleansed of heavy metals such as mercury, which remains trapped in the bed of adsorbent or capture mass
Data Source
AI summary
A process for the elimination of heavy metals, in particular mercury and possibly arsenic and lead, present in a gaseous or liquid effluent by means of a fixed bed process using an adsorbent in the form of monolithic or supported extrudates, said extrudates being characterized by a length h and a section comprising at least three lobes. The adsorbent is composed of at least one active phase based on sulphur in the elemental form or in the form of a metallic sulphide. The process is advantageously applicable to the treatment of gas of industrial origin, synthesis gas, natural gas, gas phase condensates and liquid hydrocarbon feeds.