What is the average ppm of oil content produced by lng?

In the process of liquefied natural gas (LNG) production, the control of oil content is an important quality index, but the specific value range varies with the production process, raw gas quality and testing standards. The following is a professional analysis of the oil content in LNG production based on industry practice and technical data:

industry Standard and Detection of Oil Content in 1. LNG

1. test standard:
   • impurity testing for LNG usually follows international standards (e. g., ISO 6978) or regional specifications, focusing on indicators such as sulfide, mercury, and water dew point, specific standards for oil content vary from application scenario to application scenario.
   • Part of the literature mentioned, the oil content of LNG needs to be controlled at a very low level (e. g. Less than 1 mg/m & sup3;) To avoid pollution to downstream equipment or combustion process.
2. Detection method:
   • gas chromatography: Through the separation and quantitative analysis of hydrocarbon components in the gas, it can indirectly reflect the oil content.
   • infrared spectroscopy suitable for detecting trace oil, but it should be carried out under laboratory conditions.
   • online monitoring technology some LNG plants adopt real-time monitoring system to dynamically control the oil content.

Oil Content Control in 2. LNG Production

1. feed gas treatment:
   • natural gas must be passed before it is liquefied. Desulfurization, dehydration, deacidification and other purification processes to remove impurities (including oil).
   • deep purification technology(such as molecular sieve adsorption, membrane separation) can further reduce the oil content.
2. liquefaction process control:
   • during low-temperature liquefaction, oil may be precipitated due to condensation and needs to be passed through precision filtration or centrifugal separation removal.
   • process optimization(such as adjusting the refrigeration temperature, pressure) can reduce the residual oil.
3. Terminal Equipment Processing:
   • at an LNG terminal or fueling station, it may be equipped oil filter or adsorption device final purification.

Reference for Typical Oil Content of 3.

• High Purity LNG: LNG used for automobile fuel or chemical raw materials, the oil content is usually controlled 0.1-1 mg/m³(ppm level).
• LNG for general industrial use: Oil content may be relaxed 1-5 mg/m³ depending on user needs.

4. Factors Affecting Oil Content

1. quality of feed gas: The associated gas or coalbed methane in the gas field may have high oil content, and the pretreatment shall be strengthened.
2. Production process: The advanced nature of the purification process and liquefaction equipment directly affects the level of oil content control.
3. Transportation and storage: LNG may introduce trace oil due to equipment contamination during transportation and storage.

5. Summary

the oil content in LNG production varies by process and demand and is usually controlled 0.1-5 mg/m³(ppm level). If specific values are required, it is recommended that:

1. review industry standards production, Storage and Shipment of Liquefied Natural Gas (LNG) (GB/T 20368-2021).
2. Consulting production enterprises: Obtain its quality inspection report or process parameters.
3. Laboratory testing: Quantitative analysis of samples by professional institutions.