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Related Experiment Videos

Critical point drying: contamination in transitional fluid supply cylinders

K D Hoagland, J R Rosowski, A L Cohen

    Scanning Electron Microscopy
    |January 1, 1980
    PubMed
    Summary

    Contamination in bottled gases, including CO2, can lead to oily residues after critical point drying (CPD). Regular cylinder inspection, cleaning, and the use of in-line filters are recommended to ensure gas purity for critical applications.

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    Area of Science:

    • Materials Science
    • Chemical Engineering

    Background:

    • Bottled gases like carbon dioxide (CO2) and Freon are crucial for critical point drying (CPD).
    • Supply cylinders can accumulate contaminants such as rust, dirt, and oily residues over their long service life (potentially over 40 years).
    • Standard purity testing occurs only once after manufacturing, with subsequent handling potentially introducing further contamination.

    Purpose of the Study:

    • To highlight the issue of contamination in bottled gas supply cylinders used for critical point drying.
    • To recommend improved practices for the bottled gas industry and end-users to ensure gas purity.

    Main Methods:

    • Observation of oily residue in CPD bombs and contaminants in supply cylinders.
    • Review of bottled gas cylinder handling, testing, and maintenance procedures.

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  • Analysis of potential contamination sources and their impact on transitional fluids.

    • Main Results:

    • Oily residues were observed in CPD bombs, linked to contaminants in CO2 and Freon supply cylinders.
    • Cylinders may contain rust, dirt, and oil due to infrequent cleaning and prolonged use.
    • Inadvertent backfilling can introduce further contamination into supply cylinders.

    Conclusions:

    • The bottled gas industry should implement regular tank inspections and chemical cleaning protocols.
    • Users of bottled gas for CPD should be aware of cylinder handling and cleaning practices.
    • Development of in-line filters and the use of higher-grade gases are recommended to ensure clean, oil-free transitional fluids for CPD.