Natural-Gas Dehydrator

ExxonMobil introduced its cMIST technology, which dehydrates natural gas using a patented absorption system inside pipes and replaces the need for conventional dehydration-tower technology. This inline technology could be deployed in both land-based and offshore natural-gas-production operations. The technology, developed and field-tested by ExxonMobil, more efficiently removes water vapor present during the production of natural gas, a process that reduces corrosion and equipment interference. cMIST reduces the size, weight, and cost of dehydration, resulting in reductions of surface footprint by 70% and the overall dehydration system’s weight by half. Exxon­Mobil’s cMIST technology relies on a proprietary droplet generator to break up conventional solvent into tiny droplets that become well dispersed in the gas flow, thereby increasing the surface area for the absorption of water from the gas. Then, an inline separator coalesces the water-rich glycol droplets and moves them to the outside wall of the pipe for effective separation from the dehydrated natural gas. The water-rich glycol is regenerated using a conventional system and is sent back to the droplet generator to be used again. Exxon­Mobil has licensed cMIST technology to the Chemtech division of Sulzer to facilitate deployment across the oil and gas industry.