Multi-Stream Chromatography Monitoring with Selection Valve
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Solution Overview
Problem
Liquid chromatography (LC) systems in pharmaceutical manufacturing face limitations in sample collection and analysis speed, leading to time delays and reduced accuracy in monitoring and controlling drug manufacturing processes, which are costly and hinder efficient process control.
Innovation Solution
A chromatographic apparatus with a source-selection component that interfaces with multiple pharmaceutical process streams and standard sources, utilizing an injection valve, sample pump, and selection valve to enable rapid and frequent analysis, supporting on-line and at-line monitoring and control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional LC systems are used with single process stream monitoring, then the system is simple to operate, but the analysis time is long (half hour to an hour) and sampling frequency is limited
Solution Approach 1:
The LC system is configured to monitor multiple process streams simultaneously through a single instrument, with a multi-port valve enabling sequential sampling from different streams. This multi-functional capability increases sampling frequency and productivity without requiring separate instruments for each stream, thereby reducing overall analysis time while maintaining operational simplicity.
2Adaptability or versatility
If multiple process streams are monitored using traditional LC systems, then more streams can be analyzed, but the device complexity increases due to additional plumbing and control requirements
Solution Approach 1:
Multiple process stream monitoring functions are merged into a single LC system through a multi-port valve that sequentially connects different process streams to the same instrument. This consolidation approach enables analysis of multiple streams without proportionally increasing device complexity, as one instrument handles multiple streams through time-sequential sampling rather than requiring parallel instruments.
Solution Approach 2:
A multi-port valve serves as an intermediary component that manages the connection between multiple process streams and the single LC instrument. This intermediary device enables flexible routing and sequential sampling from different streams, providing adaptability to monitor multiple process streams while keeping the overall system architecture relatively simple and controllable.
3Measurement precision
If sample collection is delayed to accommodate analysis time, then analysis accuracy is maintained, but the accuracy of optimal collection of process stream is reduced
Solution Approach 1:
The system performs preliminary sampling and Queuing of process stream samples before analysis is completed. By collecting samples continuously and maintaining a queue of ready samples, the system can immediately analyze new samples as soon as the instrument is available, eliminating delays between collection and analysis. This preliminary action ensures both analysis accuracy and optimal collection accuracy by removing the time lag that would otherwise compromise manufacturing precision.
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 configuration reduces sample collection time lag, enables rapid analysis, and increases sampling frequency, allowing for real-time monitoring and efficient detection of process streams and apparatus faults, thereby improving the accuracy and efficiency of drug manufacturing processes.
Implementation Method 1
Liquid chromatography (LC) involves a separation process, which supports chemical analysis and preparation. A typical LC apparatus includes a tube or other vessel packed with a stationary inert porous material; a fluid containing a sample of interest is passed through the porous material.
Implementation Method 2
Distinct chemical compounds contained in the fluid often have distinct affinities for the stationary material held in the column. Consequently, as the fluid moves through the chromatographic column, various chemical compounds are delayed in their transit through the column by varying amounts of time in response to their interaction with the stationary porous material in the column.
Data Source
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AI summary
An analytical apparatus includes a sample-injection valve, a sample pump, at least two sources of standards, and a selection valve. The sample-injection valve has an output port in fluid communication with a LC column, and an input port in fluid communication with a mobile-phase supply line. The at least two sources of standards are associated with at least two pharmaceutical compounds. The selection valve fluidically and selectably connects the sample pump to the at least two sources of standards, to the sample-injection valve, and to at least two pharmaceutical-manufacturing process lines associated with the at least two pharmaceutical compounds. A method for controlling a pharmaceutical manufacturing process includes switching the selection valve to alternately and repeatedly sample the at least two sources of standards and material flowing through the at least two pharmaceutical-manufacturing process lines.