ASTM WK24472

    New Test Method for Determination of Elemental Sulfur in Natural Gas Using Sulfur Chemiluminescence Detector

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    Developed by Subcommittee: D03.05 | Committee D03 | Contact Staff Manager



    WK24472

    1. Scope

    The transportable elemental sulfur reactor is used to convert the elemental sulfur in the side stream of a flowing gas stream into an easily detectable molecule. This is accomplished by sampling a representative portion of the natural gas stream and bubbling it through a chemical reaction of Triphenilphosphine (TPPS) in a solution of Dimethylformamide (DMF) that selectively reacts with crystals of elemental sulfur. Liquid samples extracted from the transportable elemental sulfur reactor are injected in to the elemental sulfur GC (HP 5890 w/ Sievers 350 SCD). All sulfur compounds are separated by means of a capillary column and directed in to a flameless burner to form sulfur oxide. The sulfur oxide will then react with ozone resulting in the formation of sulfur dioxide, oxygen, and an emission of light. The light emitted is detected by a photomultiplier tube and turned in to an electrical signal proportional to the concentration of sulfur in the sample. The concentration of TPPS is equivalent to the concentration of elemental sulfur found in the gas. Very low levels of S8 are being determined by this method (LDL ~-.1 mg S8/300 ml solution, 0.0001 lb/MMscf and potential 0.34 lb./MMscf). It is very important that any contamination with sulfur be strictly avoided.

    Elemental sulfur impacts the quality of pipeline natural gas and deposits on pipeline flanges, fittings and valves, thereby, impacting their performance. Natural gas suppliers and distributers are in need of a standardized test method for measuring elemental sulfur. Some government regulators are also interested in development of this test method since it would provide a means for assessing the contribution of elemental sulfur in pipeline natural gas to the SOx emission inventory from burning of natural gas.


    Keywords

    Pipeline, gaseous fuels

    The title and scope are in draft form and are under development within this ASTM Committee.

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    Work Item Status

    Date Initiated:
    06-06-2009

    Technical Contact:
    Shahid Razzak

    Item:
    001

    Ballot:
    D03 (14-02)

    Status:
    At Society Review