July 2007

Special Report: Liquefied Natural Gas Developments

Improve recovery of intermediate components with LNG

Using LNG as feed stream provides opportunities to optimize methods for recovering intermediate components in gas processing

Huang, S., Chevron Energy Technology Co.

More countries will supplement energy requirements through liquefied natural gas (LNG) imports. But pipeline specifications for LNG users vary from nation to nation. Most LNG now shipped is considered "rich" and includes heavier hydrocarbons (C2+). However, LNG markets in the US and Europe cannot inject "rich" LNG into their natural gas (NG) pipelines without pretreatment to remove C2+ hydrocarbons. Cost-effective processes are needed to separate intermediate (C2+) components from the LNG. For this purpose, many gas processing schemes based on expanders can be borrowed. However, since LNG contains practically unlimited refrigeration, the separation efficiency is only limited by the intrins

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