5 May 2008 -- ExxonMobil said it plans to spend more than $100 million to complete an improved natural gas treating technology designed to make carbon capture and storage more affordable and help reduce greenhouse gas emissions.
The company plans to build a commercial demonstration plant in Wyoming, where it will use ExxonMobil's Controlled Freeze Zone (CFZ) approach. CFZ is a single-step cryogenic separation process that freezes out and then melts the CO2 and removes other components including hydrogen sulfide, which is found in so-called sour gas.
The CFZ process is designed to discharge the CO2 and other components as a high-pressure liquid stream for injection into underground storage or for use in reservoir management to enhance oil recovery. Besides reducing the cost of separation, transportation and reinjection, the CFZ process can eliminate the use of solvents, sulfur plants and CO2 venting in processing of the natural gas.
The new plant will move the CFZ technology toward commercial application. It will be located at ExxonMobil's Shute Creek Treating Facility. It will process about 14 million cubic feet of gas per day for injection and test a wide range of gas compositions to determine how well it may apply to the world's undeveloped gas resources.
Construction is slated to begin this summer with operational startup in late 2009. Testing is expected to occur over one to two years.
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