Wet Air Oxidation Catalyst Regeneration With Ion Exchange
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Solution Overview
Problem
Current methods for regenerating hydrogenation catalysts used in biomass conversion processes are inefficient, costly, and damaging to the catalyst's structure, particularly due to the use of hydrogen peroxide, which leads to reduced catalytic activity and increased production downtime.
Innovation Solution
A method utilizing a wet air oxidation regeneration (WAOR) system with atmospheric switching and an ion exchange (IX) bed to remove impurities, maintaining catalyst integrity and activity, and incorporating anion exchange resin to recycle effluents, reducing fresh water consumption and regeneration time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hydrogen peroxide is used to regenerate hydrogenation catalysts, then impurities are removed from the catalyst, but the catalyst's physical strength and surface area are damaged over time
Solution Approach 1:
The patent changes the chemical parameters of the regeneration process by replacing hydrogen peroxide with oxygen and water, operating at milder temperatures (50-200°C) and pressures to remove impurities while preserving catalyst structure. This parameter change resolves the contradiction by achieving impurity removal without the structural damage caused by harsh oxidants.
Solution Approach 2:
The patent uses oxygen from air as a disposable, inexpensive oxidant that can be continuously supplied, replacing expensive and hazardous hydrogen peroxide. This allows for continuous regeneration operations without the storage and handling issues of hydrogen peroxide, maintaining catalyst activity sustainably.
2Reliability
If hydrogen peroxide is used for catalyst regeneration, then impurities are removed, but storage and handling become challenging on commercial scale
Solution Approach 1:
The patent enables the system to generate its own oxidant in-situ by using oxygen from air and water to produce the necessary oxidizing conditions for regeneration. This eliminates the need for external hydrogen peroxide storage and handling, allowing commercial-scale operations to proceed without hazardous material management.
3Productivity
If frequent catalyst replacement is performed to maintain conversion, then product yield is maintained, but production downtime and costs increase
Solution Approach 1:
The patent implements continuous in-situ regeneration of the hydrogenation catalyst during production operations. The regeneration process occurs without shutting down the reactor or removing the catalyst, maintaining continuous product formation while restoring catalyst activity. This eliminates production downtime associated with catalyst replacement or external regeneration.
Solution Approach 2:
The patent performs preliminary regeneration actions by periodically treating the catalyst with oxygen and water to prevent complete deactivation. This proactive maintenance approach keeps the catalyst in an active state, preventing the need for frequent replacements and maintaining steady production levels.
4Productivity
If sulfur-containing impurities accumulate on the catalyst, then catalytic activity decreases, but regeneration frequency must increase
Solution Approach 1:
The patent implements a feedback-based regeneration system where catalyst performance is monitored and regeneration is triggered when sulfur accumulation reaches threshold levels. The oxygen and water treatment is applied to remove sulfur-containing impurities, restoring catalyst activity and extending its operational lifespan without frequent replacements.
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 method effectively regenerates hydrogenation catalysts, maintaining catalyst performance and reducing water usage, thereby improving operational efficiency and reducing catalyst replacement frequency.
Implementation Method 1
wet air oxidation regeneration (WAOR) system
Implementation Method 2
contacting at least a portion of the effluent with an ion exchange resin to produce an ion exchange-treated effluent
Data Source
AI summary
The present disclosure provides systems and methods for regenerating a hydrogenation catalyst with reduced water consumption and/or shortened overall regeneration time. The method can include contacting a fouled hydrogenation catalyst with a first flushing medium comprising water and a gaseous phase comprising oxygen and optionally a second flushing medium comprising water and a gaseous phase comprising at least 90% nitrogen by volume. The method can further include treating the effluents of the flushing mediums by ion exchange resin to remove impurities in the effluents.