Monolith Separation Column Sealing for High-Pressure Flow Control
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Solution Overview
Problem
Conventional high performance liquid chromatography methods using monolith columns face issues with degradation of separation performance due to solvent flow rate and chemical component elution at high pressures, leading to increased analysis time and mobile phase consumption.
Innovation Solution
A monolith type separation column design featuring a cylindrically formed porous monolith rod with a coating material on its outer circumference, a support member, and a rod fixing material packed into the gap between the coating and support member, with the upper end face sealed to manage solvent flow and prevent leakage, allowing for reduced solvent flow rates and maintaining high separation performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the liquid flow velocity is increased to reduce the analysis time, then the productivity is improved, but the consumption of the mobile phase increases
Solution Approach 1:
The patent uses a monolith porous material with controlled pore size and distribution to enable high flow velocities while maintaining efficient separation. The porous structure provides large surface area for separation while allowing rapid solvent flow, thus reducing analysis time without proportionally increasing mobile phase consumption.
Solution Approach 2:
The patent optimizes parameters including pore size (0.1-10 μm), porosity (30-70%), and monolith rod diameter (0.5-5 mm) to achieve the best balance between flow rate and separation performance. By carefully controlling these parameters, the system achieves fast analysis with reduced mobile phase consumption compared to conventional columns.
2Productivity
If a monolith rod with diameter of 4 mm or 4.6 mm is used to increase porosity, then the productivity is improved, but the consumption of the mobile phase increases
Solution Approach 1:
The patent applies different properties to different parts of the column system. The monolith rod has high porosity and large pore size for fast flow, while the outer coating layer provides sealing and structural support. This local differentiation allows the column to achieve high productivity with reduced mobile phase consumption by optimizing each component's function.
Solution Approach 2:
The patent creates a composite structure combining the monolith porous rod with an outer coating material. The monolith provides high porosity and fast flow paths, while the coating material provides structural integrity and sealing. This composite approach enables reduced mobile phase consumption while maintaining high separation efficiency.
3Manufacturing precision
If heating is applied to improve contact between column unit and monolithic adsorbent, then the manufacturing precision is improved, but the separation performance degrades due to removal of octadecylsilyl group
Solution Approach 1:
The patent carefully controls the heating temperature parameter during manufacturing to be below the threshold that causes decomposition of the octadecylsilyl group. By optimizing the heating temperature and duration, the patent achieves sufficient contact between components while preserving the chemical integrity of the stationary phase, thus avoiding degradation of separation performance.
4Productivity
If the monolithic molding is made thinner to reduce solvent flow rate, then the productivity is improved, but the separation performance degrades due to significant heating influence
Solution Approach 1:
The patent uses a porous monolith structure that provides high surface area and efficient separation even in thin configurations. The porous network maintains structural integrity and thermal stability, allowing thin columns to achieve low flow rates without compromising separation performance through excessive heating effects.
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 design reduces solvent flow rates, prevents chemical component elution, and minimizes leakage at high pressures, thereby reducing analysis time while maintaining high separation performance and reducing mobile phase consumption.
Implementation Method 1
the monolith column has an integrated structure of a three-dimensional network skeleton and relevant void (flow path, macro pores, and through pores)... enables a column to have a large porosity and accordingly a nonincreasing flow resistance
Implementation Method 2
a resin coating material is provided on the outer circumferential surface of the porous material in order to prevent leakage of a mobile phase from the side face of the column
Implementation Method 3
a rod fixing material fitted or packed into a gap between the coating material and the support member; the upper end face of the rod fixing material is sealed... prevent leakage at high pressure
Data Source
AI summary
The flow rate of a solvent is reduced as a separation column and the separation performance is improved even under high-pressure conditions. There is provided a separation column including a monolith rod into which a sample and a mobile phase flow, the separation column comprising: a coating material coated on the outer circumference of a monolith rod; a support member into which the monolith rod coated with the coating material is inserted, and a rod fixing material fitted into or filled a gap between the coating material and the support member; wherein the upper end face of the rod fixing material is sealed, the upper end face being the inflow-side end when the separation column is assembled.