SPTFF Process Control System for Permeate Flux Management
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Solution Overview
Problem
Current filtration processes, particularly in biotechnology, face challenges in efficiently concentrating microfiltration harvest fluid and managing variable product concentrations, which affect the performance of single-pass tangential flow filtration (SPTFF) and ultrafiltration, leading to issues such as decreased permeate flux and increased liquid volumes, limiting their scalability and efficiency.
Innovation Solution
Implementing a process control system that uses a variable flow reduction factor (FRF) in SPTFF to adjust permeate flow based on changing product concentrations, combined with a control method that varies the FRF in stepwise or continuous changes to maintain target volume reduction factors, and integrating this with ultrafiltration to manage permeate flux and retentate volume, ensuring consistent operation with upstream processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If single-pass tangential flow filtration (SPTFF) is used to concentrate microfiltration harvest fluid, then filtration efficiency is improved, but permeate flux decreases due to variable product concentrations
Solution Approach 1:
The patent implements dynamic control of the feed pump flow rate based on real-time permeate flux measurements. The system continuously adjusts the feed flow rate to maintain optimal permeate flux despite varying product concentrations in the harvest fluid, transforming a static filtration process into a dynamic adaptive system that resolves the contradiction between filtration efficiency and flux stability
Solution Approach 2:
The patent employs a feedback control mechanism where permeate flux is continuously measured and used to adjust the feed pump flow rate. The control system compares actual permeate flux against target values and dynamically modifies feed flow to maintain optimal filtration performance, enabling the system to adapt to changing product concentrations and maintain both efficiency and flux stability
2Quantity of substance
If ultrafiltration is performed to concentrate product to therapeutic levels, then product concentration is improved, but liquid volume increases requiring larger processing volumes
Solution Approach 1:
The patent uses dynamic adjustment of feed and permeate flow rates during ultrafiltration to optimize concentration efficiency. By continuously adapting flow rates based on real-time measurements, the system achieves target product concentrations more efficiently, reducing the total liquid volume that needs to be processed compared to conventional fixed-rate ultrafiltration methods
Solution Approach 2:
The patent changes operational parameters (feed flow rate, permeate flow rate, transmembrane pressure) dynamically during the ultrafiltration process to optimize concentration efficiency. By adjusting these parameters based on real-time feedback, the system achieves higher product concentrations with reduced liquid volumes and improved processing efficiency
3Productivity
If flow rates are increased to improve processing speed, then productivity is improved, but permeate flux decreases due to membrane fouling
Solution Approach 1:
The patent implements a feedback control system that continuously monitors permeate flux and adjusts feed flow rate accordingly. When permeate flux begins to decrease indicating membrane fouling, the system automatically reduces feed flow rate to prevent further fouling, thereby maintaining optimal processing speed without sacrificing flux
Solution Approach 2:
The patent incorporates periodic backflushing or cleaning cycles into the filtration process. These periodic actions reset the membrane surface by reversing flow or applying cleaning solutions, preventing cumulative fouling and maintaining high permeate flux over extended processing periods, thus enabling sustained high-speed operation
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 enhances the concentration of microfiltration harvest fluid, maintains efficient permeate flux, and allows for scalable operations by actively managing flow rates and volumes, thereby improving the overall efficiency and productivity of filtration processes.
Implementation Method 1
Filtration is pressure-driven process that uses membranes to separate components in a liquid solution or suspension according to size differences between the components
Implementation Method 2
Filtration is pressure-driven process that uses membranes to separate components in a liquid solution or suspension according to size differences between the components
Implementation Method 3
a sensor disposed at the permeate outlet to determine a flow rate at the permeate outlet
Implementation Method 4
a control system that is coupled to the sensor and the upstream processes, and adapted to control the flow rate of one or more of the one or more upstream processing units according to the flow rate at the permeate outlet
Data Source
AI summary
Systems and methods used to control tangential flow filtration are provided, including control systems and methods for use with connected systems with upstream processing units, such as chromatography processing units, in fluid communication with a tangential flow filtration processing unit. Also included are control systems and methods for performing continuous concentration using single-pass tangential flow filtration with permeate flow control.