Trap Column Pre-Pressurization for Stable Sample Transfer

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Solution Overview

Problem

Existing methods for introducing samples into separation columns in liquid chromatography systems lead to substantial wear of trap and separation columns, deteriorating analytical results due to pressure spikes and sample dispersion.

Innovation Solution

The method involves pressurizing the trap column to a first pressure exceeding ambient pressure before establishing a fluid connection with the separation column, thereby avoiding pressure spikes and reducing wear on system components.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the trap column is connected to the separation column at atmospheric pressure and then pressurized, then the sample can be introduced into the separation column, but pressure spikes occur causing substantial wear of the columns and deteriorating analytical results

Engineering Contradiction:

Improvecolumn lifetimeVSAvoidpressure spikes

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The trap column is pressurized to the first pressure before being fluidly connected to the separation column. This preliminary pressurization action eliminates pressure spikes that would occur if pressurization happened after connection, thereby preventing wear on the columns and maintaining analytical result quality.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system applies counter-pressure to the trap column before connection to prevent the harmful pressure spike effect. By pre-pressurizing the trap column to match the separation column pressure, the invention counteracts the pressure differential that would otherwise cause damaging pressure spikes during sample introduction.

Inventive Principle:

Principle #9Preliminary anti-action

2Reliability

If the trap column is pressurized before connection, then wear on columns is reduced, but additional pressurization step is required

Engineering Contradiction:

Improvecolumn lifetimeVSAvoidprocess steps

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The metering device is configured to perform multiple functions: it can pressurize the trap column to the first pressure before connection, and subsequently control the flow from the trap column to the separation column. This multi-functionality integrates the pressurization step into the existing sample introduction workflow without requiring separate equipment.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The trap column is pressurized using the system's own metering device and solvent reservoir, without requiring external pressurization equipment. The system serves itself by using its existing components to prepare the trap column for connection, thereby adding functionality without increasing overall system complexity.

Inventive Principle:

Principle #25Self-service

3Productivity

If the sample is introduced directly from the needle into the separation column, then the process is simplified, but sample concentration is not achieved

Engineering Contradiction:

Improvesample concentrationVSAvoidinjection process

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The injection process is divided into two distinct stages: first, sample introduction and concentration in the trap column at atmospheric pressure; second, controlled transfer to the separation column under pressure. This segmentation allows the trap column to function as a dedicated concentration zone, improving sample concentration capability while maintaining a manageable two-stage process.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The trap column serves as an intermediary component between the sample needle and the separation column. It temporarily holds and concentrates the sample before controlled transfer, enabling sample concentration without requiring direct injection into the separation column. This intermediary role justifies the additional component while achieving the productivity benefit.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 increases the lifetime of the system components and improves analytical results by minimizing dispersion and ensuring more defined peaks in subsequent analyses.

Implementation Method 1

pressurizing the trap column to a first pressure exceeding ambient pressure

Methodology Applied

Scientific EffectPressurisation: Pressurisation

Implementation Method 2

Different constituents of the sample adhere to the separation column in a different manner

Methodology Applied

Scientific EffectChromatography: Chromatography

Implementation Method 3

Different constituents of the sample adhere to the separation column in a different manner

Methodology Applied

Scientific EffectAdsorption: Adsorption

Data Source

PatentUS12590932B2Method of introducing a sample into a separation column and corresponding system

Publication Date: 2026.03.31 DIONEX SOFTRON

AI summary

A method of introducing a sample into a separation column includes introducing the sample into a trap column, isolating the trap column from ambient atmosphere and pressurizing the trap column to a first pressure while the trap column is isolated from ambient atmosphere, providing a fluid connection between the trap column and the separation column after pressurizing the trap column to the first pressure, supplying the sample from the trap column to the separation column.