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Gas Chromatography Analysis in Chemical and Petrochemical Plants

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Ammonia Plants

In an ammonia plant, methane is mixed with steam in a reformer, and through a chemical process, carbon dioxide is removed and air is added to achieve commercial products such as nitrate fertilizers and smelling salts.

  • Maintain a hydrogen-to-nitrogen ratio for optimum synthesis conversion
  • Monitor for unconverted carbons
  • Monitor for complete remove of carbon monoxide
  • Optimize purge gas rates and rate BTU for use as fuel gas
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Methanol Plants

Methanol is a critical building block for numerous products, including formaldehyde, resin glues, synthetic rubber, and fungicides, as well as in common consumer items like nail polish remove and aspirin. 

Without accurate measurements, methanol plants can experience sub-optimal reformer performance that reduces methanol products and methanol impurities that reduce product value and compromise product specifications.

The data that an Emerson gas chromatograph provides will help a methanol plant to:

  • Monitor for unconverted carbons
  • Minimize losses of methanol in acetone tower overhead
  • Minimize impurities in the methanol product stream
  • Minimize losses of methanol in methanol tower bottom stream
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Ethylene Plants

An ethylene plant produces polymer-grade ethylene (99.99%) and produces major by-products such as propylene, a butadiene-rich C4 stream and C6-C8 aromatics-rich pyrolysis gasoline. The ethylene plant is the major supplier of feedstock to the polyethylene plant for the creation of polyethylene plastics.

Due to the commodity nature of ethylene, product quality is critical to a plant, making the monitoring of product quality critical, since off-specification product cannot be sent to the product pipeline and must be disposed of – usually to a flare system. Product specifications for ethylene and propylene vary widely from plant to plant, but industry-wide, specs for product purity are getting increasingly tighter, with some compounds now being limited to parts-per-billion levels.

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Polyethylene Plants

In a polyethylene plant, an efficient, accurate process is critical to maintain the quality of plastics. Any impurities in the carbon dioxide, C1, C2. or acetylene will degrade the catalyst, and a specific ratio of hydrogen to carbon must be maintained to control the melting point. Emerson's gas chromatographs are the ideally suited to measure and track critical data, to ensure an optimum process. With an Emerson gas chromatograph, you can measure ethylene feed purity, measure comonomer feed purity, monitor impurities recycled with the diluent, and attain feedback on reaction kinetics.

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Polypropylene Plants

With Emerson's gas chromatograph products, polypropylene plants can monitor these critical variables to ensure that the process is performing at optimum levels. 

With Emerson's gas chromatograph products, polypropylene plants can monitor these critical variables to ensure that the process is performing at optimum levels.

With an Emerson's gas chromatographs, you can:

  • Ensure propylene feed purity
  • Ensure diluent feed purity (exact components may vary with the diluent used)
  • Ensure hydrogen feed purity
  • Ensure comonomer feed purity
  • Send data to the control system about reaction kinetics
  • Monitor impurities recycled with the diluent
  • Monitor impurities recycled with the propylene
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