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Natural gas sweetening is the process whereby hydrogen sulfide (H2S) and carbon dioxide (CO2) are removed from the natural gas. Both H2S and CO2 promote corrosion through the formation of acids in the presence of water and can cause stress cracking in the pipelines. 

To sweeten the natural gas, H2S, along with CO2, is reduced or removed in a contactor using an amine scrubbing process. Natural gas containing a higher concentration of H2S flows through a contactor where the amine solution absorbs the sulfur compounds from the natural gas. “Sweet” natural gas, containing low levels of H2S, exits the contactor.

Accurate measurement of the concentrations of both H2S and CO2 in the sweetening process is necessary, both at the inlet and outlet of the amine contactor.  These measurements ensure both impurities are below the tariff or contract limit prior to the natural gas being transported in a pipeline and optimizes the sweetening processes.

We provide a range of reliable, accurate solutions for natural gas sweetening applications. These provide rapid-response, low-level, interference-free detection of H2S with no requirement for a scrubber to detect low concentrations of H2S or CO2. We also offer the ability to measure H2S, carbonyl sulfide and methyl mercaptan in a single analyzer.

  • Application +

    Amine Contactor Efficiency

    Amine and glycol remove water vapor and acid gases from natural gas. Accurate measurements support the efficiency of this process, delivering better quality and higher yields.

    Recommended products:  5100HD, 5100, 931, 932, 933

    Custody Transfer

    At the custody transfer location, natural gas is sold from one party to another, and is a measurement point on the network.  The quality of the natural gas is contractually defined at the custody transfer point, including limits on moisture and hydrogen sulfide content in the gas, threshold for hydrocarbon dew point temperature, required heating value of the gas, and expected gas composition.   

    Recommended products: 5100HD, 933

    Rich Amine/Amine Regeneration

    When the amine solution has absorbed all the acid gases during sweetening, it is referred to as rich amine. The amine solution is usually regenerated by heating the solution to remove the sulfur compounds. Monitoring this solution before and after regeneration optimizes the efficiency of the regeneration process. 

    Recommended products: IPS-4

    Transmission Pipelines

    Natural gas is transported along the value chain from processing to end users via a vast network of pipelines.  To ensure the integrity of the mechanical infrastructure and meet contract or tariff limits, accurate measurements of H2S and CO2 are required.

    Recommended products: 5100HD, 5100, 931, 932, 933