Regenerable Desiccant Drying Device for Thermal Desorption

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Solution Overview

Problem

Conventional thermal desorption systems face challenges in detecting and quantifying light polar compounds due to their loss during analysis, as water vapor interferes with the separation and detection of analytes, and existing drying methods like membrane dryers can absorb polar compounds, leading to incomplete analysis.

Innovation Solution

A thermal desorption system incorporating a regenerable desiccant medium, such as inorganic salts like calcium or lithium salts, positioned between the sample introduction device and the thermal desorption device to adsorb water vapor without absorbing gaseous analytes, allowing for effective dehydration and regeneration of the desiccant medium for repeated use.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If membrane dryers are used to remove water vapor, then water vapor is effectively removed, but polar analyte compounds are absorbed and lost

Engineering Contradiction:

Improvewater vapor interferenceVSAvoidpolar analyte compounds

Core Design Contradiction:

Object-affected harmful factorsVSLoss of substance

Solution Approach 1:

A drying device containing a regenerable desiccant medium is introduced as an intermediary component between the sample introduction device and thermal desorption device. This desiccant medium selectively adsorbs water vapor from the air stream without absorbing the polar analyte compounds, thereby mediating the conflict between water removal and analyte preservation. The desiccant acts as a mediator that performs the harmful function (water removal) without causing the harmful side effect (analyte loss) that occurs with membrane dryers.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Object-affected harmful factors

If conventional drying methods are used, then water vapor is removed, but analyte detection accuracy decreases due to compound loss

Engineering Contradiction:

Improvewater vaporVSAvoidanalyte detection accuracy

Core Design Contradiction:

Object-affected harmful factorsVSMeasurement precision

Solution Approach 1:

The regenerable desiccant medium serves as an intermediary that selectively removes water vapor while leaving analyte compounds intact. This intermediary approach preserves measurement precision by preventing analyte loss during the drying process, unlike conventional methods that compromise detection accuracy.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The system changes the physical-chemical parameters of the drying process by using a regenerable desiccant medium with specific adsorption characteristics. The desiccant is selected to have high affinity for water vapor but low affinity for polar analyte compounds, thereby changing the selectivity parameter of the drying process to achieve both effective water removal and analyte preservation.

Inventive Principle:

Principle #35Parameter changes

3Object-affected harmful factors

If desiccant medium is used to adsorb water, then water vapor removal is achieved, but the desiccant requires regeneration to maintain continuous operation

Engineering Contradiction:

Improvewater vaporVSAvoidregeneration system

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The system implements periodic action through the regeneration cycle of the desiccant medium. The desiccant is periodically heated to desorb accumulated water and restore its drying capacity. This periodic regeneration allows the system to maintain continuous operation while managing the complexity of the regeneration process through systematic cycling rather than continuous complex operations.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The system applies the discarding and recovering principle by periodically discarding the water-loaded desiccant state and recovering the desiccant's drying capacity through thermal regeneration. The water is discarded during the desorption phase, and the desiccant medium is recovered and reused for subsequent drying operations, reducing waste and maintaining system functionality.

Inventive Principle:

Principle #34Discarding and recovering

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 solution enables the detection and quantification of analytes like alpha-pinene, ethanol, acetone, formaldehyde, acetaldehyde, and benzaldehyde without losing them during the drying process, improving the accuracy and efficiency of thermal desorption analysis by ensuring that only water vapor is removed, leaving the analytes intact for further analysis.

Implementation Method 1

the drying device comprises a regenerable desiccant medium that is effective to adsorb water without absorption of the gaseous analyte species in the introduced ambient air stream

Methodology Applied

Scientific EffectAdsorption: Adsorption

Implementation Method 2

the regenerable, desiccant medium is regenerated by heating of the desiccant medium using the heating device

Methodology Applied

Scientific EffectThermal desorption: Desorption

Data Source

PatentUS11264224B2Thermal desorption systems with drying devices and methods of using them

Publication Date: 2022.03.01 PERKINELMER U S LLC

AI summary

A drying device comprising a regenerable desiccant medium that is effective to adsorb water without absorption of gaseous analyte species in an introduced ambient air stream is described. The drying device can be used with a thermal desorption device to remove water vapor from gaseous analyte species prior to analysis of the gaseous analyte species. Systems including a drying device are also described.