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Another DOE-SBIR project is being conducted by TDA Research, Inc. (Wheat Ridge, Colo.), which is developing a system for getting sulfur out of coal-derived synthesis gas. Costs could be as low as 9 mills/kWh — roughly 30% less than those of conventional zinc ferrite absorption, followed by regeneration using limestone, says the project's principal investigator, Robert Copeland. Other avantages of the technology are that no expendable materials are required (all of the components can be regenerated), no waste is generated, and the process can be used for small facilities such as natural-gas processing plants. TDA's…