Carbon Block Fluidized Bed for Rapid Toxin Removal
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing extracorporeal blood treatment methods face challenges in achieving rapid toxin removal due to the limitations of using large granules of active carbon, which result in slow sorption kinetics, especially for toxins of higher molecular weight, and the difficulties in using small particles in packed columns, including issues with hydraulic resistance and even flow distribution.
Innovation Solution
The use of geometrically complex, large carbon pieces with a fine structure that allows for a short mean pore path length, combined with a porous carbon block filter, filtration bed, and cone-shaped reactor to immobilize and perfuse fine sorbent particles, enabling rapid sorption kinetics while maintaining even flow distribution and low pressure drop.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If large granules of active carbon are used in packed columns, then flow distribution is improved and hydraulic resistance is reduced, but sorption kinetics become slow especially for toxins of higher molecular weight
Solution Approach 1:
The carbon particles are segmented into smaller sizes (1-50 microns) to increase surface area and improve sorption kinetics, while the fluidized bed configuration segments the flow path to ensure even distribution around all particles, resolving the contradiction between particle size and flow distribution
Solution Approach 2:
The system changes the operational parameter from static packed column flow to dynamic fluidized bed flow, allowing small particles to be suspended and perfused uniformly, thereby achieving rapid sorption kinetics without the flow distribution problems that would occur in a packed column
2Productivity
If small particles of active carbon are used in packed columns, then sorption kinetics improve, but hydraulic resistance increases and flow distribution becomes uneven
Solution Approach 1:
The system transitions from a static packed column to a dynamic fluidized bed where particles are suspended in upward flow, converting the static high-resistance packed bed into a dynamic low-resistance suspension that maintains even flow distribution while using small particles for rapid sorption
Solution Approach 2:
The system uses hydraulic principles to fluidize the particle bed, creating an upward flow that suspends small carbon particles and eliminates channeling and uneven flow distribution problems associated with packed columns, while maintaining low pressure drop across the bed
3Productivity
If small particles of active carbon are used, then surface area increases and sorption kinetics improve, but particles become difficult to contain and separate from treated fluid
Solution Approach 1:
The system uses dynamic fluidization to contain particles during treatment, then exploits gravity for static separation when flow stops, eliminating the need for complex containment mechanisms while maintaining rapid sorption kinetics through small particle size
Solution Approach 2:
The system uses the particles' own weight and gravity to achieve self-separation from the treated fluid when flow stops, with particles naturally settling to the bottom of the vessel, eliminating the need for additional separation equipment or complex containment mechanisms
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 allows for effective and efficient toxin removal from biological fluids with rapid sorption kinetics, mechanical simplicity, and low cost, overcoming the limitations of traditional methods by using large, easily constrained carbon pieces with high external surface area and fine features.
Implementation Method 1
The pore structure of active carbon is commonly classified according to size as macropores, mesopores and micropores. See FIG. 1. It is the pore structure which gives active carbon its high surface area per unit weight, and thus its 'activity' or affinity which enables it to adsorb significant and useful quantities of toxins.
Implementation Method 2
a cone shaped reactor placed below the solid filtration block to create a fluidized bed of sorbent particles
Implementation Method 3
a filtration bed of sorbent particles positioned on the outside of the carbon block during fluid flow
Data Source
AI summary
Methods and devices for powdered sorbent regeneration of biologic fluids are disclosed. The present invention includes three novel methods, which may be used singly or in any combination, for constraining or immobilizing powders so that they can be perfused with a biological fluid or dialysate: a porous carbon block filter, a filtration bed of very fine powder, and a cone-shaped reactor.