Upflow Reactor Distributor for Dihydroxy Compound Production
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Solution Overview
Problem
Existing reactors for producing dihydroxy compounds face limitations in throughput and uniform flow distribution due to pressure drop and hydraulic issues, particularly when using catalysts with lower degrees of crosslinking, which affect reactor performance and efficiency.
Innovation Solution
An upflow reactor design is implemented, where reactants are introduced through a distributor with perforations facing away from the catalyst bed, allowing momentum dissipation upon impingement on the vessel wall, promoting a uniform flow profile and minimizing mal-distribution, thereby enhancing throughput and selectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If downflow reactor configuration is used with highly crosslinked catalyst, then hydraulic stability is improved, but reactivity and selectivity deteriorate
Solution Approach 1:
The patent inverts the conventional downflow reactor configuration to an upflow configuration. This inversion allows the use of highly crosslinked catalysts (which provide hydraulic stability) while maintaining high reactivity and selectivity, as the upward flow prevents catalyst bed compression and bead deformation that occur in downflow systems.
2Productivity
If throughput is increased in downflow reactor, then productivity is improved, but pressure drop increases and catalyst beads deform
Solution Approach 1:
The patent inverts the flow direction from downflow to upflow. This inversion eliminates the compression and deformation of catalyst beads that occur in downflow systems when throughput is increased, allowing higher productivity to be achieved without excessive pressure drop or catalyst damage.
3Productivity
If lower crosslinked catalyst is used, then reactivity and selectivity are improved, but hydraulic limitations worsen
Solution Approach 1:
The patent inverts the flow configuration to upflow, which allows lower crosslinked catalysts (with higher reactivity and selectivity) to be used without suffering from hydraulic limitations. The upward flow prevents bed compression and maintains catalyst integrity, enabling the use of more reactive but less mechanically robust catalyst formulations.
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 upflow reactor configuration achieves improved throughput and uniform flow distribution, maintaining catalyst integrity and reactor efficiency while optimizing the use of catalysts with lower crosslinking, thereby increasing the production rate and selectivity of dihydroxy compounds like bisphenol A.
Implementation Method 1
distributor being disposed at a lower end of the vessel and comprising one or more distributor perforations disposed in the distributor, at least part of which distributor perforations are in a direction facing away from the catalyst bed
Data Source
AI summary
The disclosure is directed to the use of an upflow reactor for producing a dihydroxy compound, to a method for producing a dihydroxy compound, and to a method for manufacturing polycarbonate. The upflow reactor for producing a dihydroxy compound of the disclosure comprises: a vessel; a catalyst bed disposed in said vessel; a distributor in fluid communication with an inlet through which reactants are introduced to said distributor, said distributor being disposed at a lower end of said vessel and comprising distributor perforation(s) disposed in said distributor, at least part of which distributor perforations are in a direction facing away from said catalyst bed; and a collector through which said product dihydroxy compound is removed, said collector being disposed at an upper end of said vessel.