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Chromatographic sample collection from two-phase (gas+liquid) flows.

Thomas J Bruno¹, Bret C Windom

¹Thermophysical Properties Division, National Institute of Standards and Technology, Boulder, CO, USA. bruno@boulder.nist.gov

Journal of Chromatography. A

|November 1, 2011

Summary

This summary is machine-generated.

A new device, the P(2)SC, efficiently separates vapor and liquid phases from two-phase flows for separate analysis. This innovation ensures sample integrity for accurate analytical chemistry measurements.

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Area of Science:

Analytical Chemistry
Chemical Engineering

Background:

Analyzing two-phase flows (gas and liquid) presents challenges in sample presentation.
Accurate analysis requires physical separation of phases without altering their equilibrium state.

Purpose of the Study:

To develop a simple, on-line device for the individual separation and collection of vapor and liquid phases from a two-phase flow.
To ensure no cross-contamination between the separated phases.

Main Methods:

The study introduces the P(2)SC (Phase Separation) apparatus, an adaptation of a branch point separator.
Vapor is collected downstream in a metal bellows, and liquid is collected in a Teflon tube.
Separated phases are transferable to analytical instruments via syringe or valve.

Main Results:

The P(2)SC device successfully separates vapor and liquid phases from a two-phase flow stream.
The method maintains phase integrity, preventing liquid contamination of vapor and vapor entrainment in liquid.
Demonstrated application with a thermally stressed rocket kerosene stream.

Conclusions:

The P(2)SC offers a practical solution for analyzing individual phases in two-phase flows.
This device enhances the accuracy and feasibility of analytical chemistry for complex sample streams.
The method is versatile and applicable to various analytical instruments and sample types.