Fixed Bed Reactor Treating Agent for Catalyst Protection
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Solution Overview
Problem
In gas-phase catalytic oxidation reactions using fixed bed reactors, the accumulation of catalyst inhibitors leads to decreased yield and increased pressure loss over time, due to the deterioration of catalysts and deposition of organic substances, which existing regeneration methods cannot address effectively for prolonged stable operation.
Innovation Solution
A method involving the use of a treating agent with an adsorption capacity of at least 0.05% by mass, disposed upstream of the catalyst layer, selected from materials like silica-alumina or zeolite, to adsorb and remove catalyst inhibitors, thereby preventing catalyst deterioration and maintaining high yield and suppressing pressure loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the catalyst is regularly heat-treated to burn catalyst inhibitors, then the catalyst can be regenerated, but the thermal load shortens the catalyst life
Solution Approach 1:
A treating agent layer is introduced as an intermediary between the reaction gas and the catalyst. This treating agent selectively adsorbs catalyst inhibitors (organic substances and carbides) from the reaction gas, preventing them from reaching and deactivating the catalyst. The treating agent acts as a protective barrier that removes harmful substances before they can damage the catalyst, thereby maintaining catalyst activity without requiring high-temperature regeneration treatments that would shorten catalyst life.
2Productivity
If the catalyst is used continuously without interruption, then productivity is maintained, but catalyst performance deteriorates due to inhibitor accumulation
Solution Approach 1:
The treating agent layer serves as a continuous protective intermediary that operates throughout the entire production period. It continuously adsorbs catalyst inhibitors from the reaction gas stream, enabling the catalyst to maintain high performance during prolonged continuous operation without interruption. This eliminates the need to stop production for catalyst regeneration, as the treating agent permanently removes harmful substances during normal operation.
Solution Approach 2:
The treating agent performs preliminary removal of catalyst inhibitors from the reaction gas before the gas contacts the catalyst. By pre-treating the reaction gas and removing harmful substances in advance, the catalyst is protected from deactivation, allowing continuous operation without performance deterioration.
3Device complexity
If no treating agent is used, then the reactor structure remains simple, but catalyst deterioration occurs due to inhibitor deposition
Solution Approach 1:
A treating agent layer is introduced as an intermediary between the reaction gas and the catalyst. This treating agent selectively adsorbs catalyst inhibitors (organic substances and carbides) from the reaction gas, preventing them from reaching and deactivating the catalyst. The treating agent acts as a protective barrier that removes harmful substances before they can damage the catalyst, thereby maintaining catalyst activity without requiring high-temperature regeneration treatments that would shorten catalyst life.
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 enables stable continuous operation of gas-phase catalytic oxidation over a prolonged period with high yield and reduced pressure loss, significantly reducing production costs by effectively preventing catalyst deactivation and inhibitor deposition.
Implementation Method 1
a treating agent for removing the catalyst inhibitor in the reaction gas, the treating agent having an adsorption capacity of at least 0.05 % by mass
Data Source
AI summary
The invention provides a method of gas-phase catalytic oxidation, in particular, a production method of (meth)acrylic acid, which enables stable continuous operation of gas-phase catalytic oxidation over a long term, maintaining high yield and suppressing increase in pressure loss. In the method a fixed bed reactor is used, in which a treating agent for removing organic substance and/or carbides, preferably a treating agent having an adsorption capacity of at least 0.05% by mass, as measured by crotonaldehyde as an indicator of organic substance, is disposed on the upstream side of the gas-phase oxidation catalyst layer in respect of the direction of the gas flow. It is desirable that at least a part of the treating agent is exchanged at a frequency of at least once a year.