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New technology purifies gas from carbon dioxide

Published: 31 December 2012

Constantly increasing carbon dioxide emission is the greatest threat to our environment. With new efficient processes ionic liquids are used to capture and separation of carbon dioxide from fossil fuel burning plants and to clean synthesis gas, biogas, etc. Professor Ji Xiaoyan at LTU focus on processes that can help reducing costs for capture and separation of carbon dioxide.

Although the environment is threatened the use of fossil fuels in the production of energy, heating and automotive fuels is increasing. The technologies that are currently used to clean and capture carbon dioxide emissions, such as from fossil-fired power plants, is expensive and not efficient enough. This is a ocstacle for using the technology in large scale.

Professor Ji Xiaoyan, Department of Energy Sciences at Luleå University of Technology, develop new technologies to capture and separate carbon dioxide. Gas mixtures with carbon dioxide are injected into an ionic solution. A chemical  reaction make the carbon dioxide remain in the solution while the rest of the gas is transported away. The viscosity of the ionic liquid is a particularly important factor
that affects the separation process that is studied in the research-project funded by the Swedish Research Council.

With better knowledge of the viscosity of ionic solutions, it becomes possible to design the separation process giving better power at lower cost.The goal of the research is, at a first step, to develop a theoretical model that clarifies the relationships between temperature, pressure and composition in ionic liquids and how these relationships affects the separation process. The model is the basis for developing new energy-saving technology in which ionic solutions are used for purifying gases from carbon dioxide.