Bubble Dispersing Unit for Preparative Liquid Chromatography
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
High-pressure and high-flow rate liquid chromatography processes face issues with bubble formation due to outgassing, which impairs solvent mixing and detector performance, and existing solutions like helium sparging and vacuum degassing are costly, inconvenient, or ineffective, especially for preparative- and process-scale applications.
Innovation Solution
The implementation of bubble-dispersing components in the liquid pathway to break up bubbles into smaller sizes, promoting their re-dissolution and minimizing their impact on detector readings, particularly suited for high-pressure and high-flow rate systems where traditional degassing methods are impractical.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high flow rates and high pressures are used in liquid chromatography, then productivity and purification quantity are improved, but bubble formation due to outgassing increases, impairing solvent mixing and detector performance
Solution Approach 1:
The invention extracts and removes bubbles from the liquid stream using a vacuum degasser positioned before the pump. The vacuum chamber creates a pressure environment that causes dissolved gases to come out of solution and form bubbles, which are then separated from the liquid phase and removed, preventing them from causing problems downstream in the high-pressure system
Solution Approach 2:
The vacuum degassing step is performed preliminarily before the high-pressure pumping and solvent mixing operations. By removing dissolved gases in advance, the system prevents bubble formation during subsequent high-pressure operations, eliminating the need for complex online bubble removal systems
2Measurement precision
If helium sparging or vacuum degassing is used to remove bubbles, then detector performance is improved, but device complexity and cost increase
Solution Approach 1:
The vacuum degasser is designed to be a self-contained unit that automatically removes bubbles from the solvent without requiring external intervention or complex control systems. The vacuum pump creates the necessary pressure differential, and the system self-regulates the degassing process, eliminating the need for additional sensors, valves, or control electronics
3Object-affected harmful factors
If vacuum degassing is used for high flow rates, then bubble removal is improved, but effectiveness decreases due to insufficient residence time
Solution Approach 1:
The invention transitions from attempting to remove bubbles in the time domain (which is limited by flow rate and residence time) to removing bubbles in the pressure domain. By creating a vacuum environment, the system changes the pressure conditions to favor bubble formation and separation, making the process effective even at high flow rates where traditional time-based removal would fail
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 effectively mitigates the effects of bubble formation, enhancing the accuracy and reliability of liquid chromatography by ensuring better solvent mixing and detector performance, even in high-pressure and high-flow rate conditions, without the need for costly or complex degassing methods.
Implementation Method 1
In-line vacuum degassers offer an alternative solution. Such degassers utilize a semipermeable membrane disposed in an evacuation chamber that removes dissolved gases.
Implementation Method 2
the impact of bubble formation in preparative- and process-scale LC apparatus can be mitigated by breaking up the bubbles so that the remaining smaller bubbles are more readily dissolved
Data Source
AI summary
A method of liquid chromatography includes providing one or more solvent reservoirs, providing a solvent pump, drawing one or more solvents into the pump in response to a pressure drop that promotes outgassing of the solvents, and dispersing outgassed bubbles into smaller bubbles to promote re-dissolution of the gas. A liquid-chromatography apparatus includes at least two solvent reservoirs, a pump, at least one bubble-dispersing unit that receives a pressurized flow of proportioned solvents from the pump, and a control unit. The control unit includes a processor and a memory that stores instructions; the control unit controls proportioning of solvents to obtain a preselected solvent composition, and pumping at flow rates to support preparative-scale or process-scale liquid chromatography.