Hybrid Vertical Bubble Plug Flow Reactor Design
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Solution Overview
Problem
Existing methods for reacting gas and liquid reactants in catalyzed reactions face challenges such as high capital costs, inefficient catalyst use, and inconsistent reaction conditions, particularly in batch and continuous stirred tank reactors.
Innovation Solution
A hybrid vertical bubble plug flow reactor is used to react gas and liquid reactants, allowing for controlled reaction conditions and efficient catalyst use by mixing the reactants at the bottom inlet and maintaining a gaseous headspace within the reactor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If batch reactors are used for catalyzed gas-liquid reactions, then catalyst efficiency (TON) is improved, but capital costs and downtime between batches increase
Solution Approach 1:
The reactor is segmented into distinct functional zones: a reaction zone where gas and liquid reactants mix and react, and a separation zone where product is continuously removed. This segmentation allows the system to maintain high catalyst efficiency in the reaction zone while achieving continuous operation and higher throughput through the separation zone.
Solution Approach 2:
The system performs preliminary mixing of gas and liquid reactants at the bottom inlet before they enter the main reaction zone. This preliminary action ensures optimal mixing and catalyst contact from the start, maintaining high TON while enabling continuous operation that increases throughput.
2Productivity
If continuously stirred reactors are used, then productivity is improved, but catalyst efficiency deteriorates and separation complexity increases
Solution Approach 1:
The reactor separates the mixing function (at the bottom inlet) from the reaction function (in the vertical tubular member). This segmentation allows continuous feeding of reactants while maintaining optimal catalyst contact in the reaction zone, preserving catalyst efficiency despite continuous operation.
Solution Approach 2:
The system extracts the separation function into a distinct outlet configuration where product is continuously removed through the extraction port. This extraction of the separation function from the reaction zone allows continuous production without compromising catalyst efficiency in the reaction zone.
3Manufacturing precision
If plug flow reactors are used, then residence time control is improved, but gas accumulation and inconsistent reaction conditions occur
Solution Approach 1:
The system introduces a vertical dimension to the flow path with the vertical tubular member, allowing gas and liquid to flow upward together. This dimensional change prevents gas accumulation in high points while maintaining consistent residence time, as both phases move through the reactor in a controlled vertical flow pattern.
Solution Approach 2:
The vertical tubular member acts as an intermediary that facilitates uniform mixing and consistent contact between gas and liquid phases throughout the reaction zone. This intermediary structure ensures stable reaction conditions by maintaining consistent phase distribution and residence time across the reactor.
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 method achieves high Turnover Numbers (TONs) for the catalyst, indicating efficient use, while avoiding the drawbacks of traditional reactor types, such as batch bubble reactors and continuous stirred tank reactors.
Implementation Method 1
bubble reactor for catalysed gas-liquid reactions
Implementation Method 2
gas reactant is mixed with the liquid reactant
Implementation Method 3
Plug flow reactors have not generally been used for these reactions because typically they involve long coils of tubes to realize sufficient residence time and sufficient heat transfer area
Implementation Method 4
reacting a gas reactant and liquid reactant in the presence of a catalyst
Data Source
Figure 1
AI summary
A hybrid vertical plug flow reactor is comprised of a bottom inlet and a top outlet having vertical tubular member disposed there between, wherein the bottom inlet has separate gas reactant inlet and separate liquid reactant inlet whereby the gas reactant is mixed with the liquid reactant and the outlet has an extraction port, the extraction port extending sufficiently to withdraw the liquid product from the reactor and maintain a gaseous head space within the tubular member of the reactor. The hybrid vertical bubble plug flow reactor is useful to react a gas reactant and liquid reactant that are reacted at a molar ratio of gas reactant/liquid reactant that is in excess of a stoichiometric requirement of gas reactant so that the gas reactant forms bubbles and the reactants react in the presence of a catalyst to form a reaction product.