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Increased LNG production efficiency through nitrogen (N2) and carbon dioxide (CO2) capture using cryogenic pressure swing adsorption (PSA) through the characterisation and modification of adsorbents.
This project will explore the potential uses of novel molecular sieve materials to remove/capture CO2 and N2 from liquid natural gas (LNG) production trains, using advance pressure swing adsorption (PSA) technologies at near cryogenic conditions.
It will involve the study of a number of commercially available adsorbents which have been characterised as a function of temperature, pressure, and flow rate and feed-gas composition. A select number of commercial adsorbents were subjected to cyclical testing and regeneration to determine their adsorption capacity as a function of time. This information will be used to assist in the development and synthesis of several new adsorbents. With particular interest in deposition-controlled pore sizing and calixarene synthesis. All new adsorbents will be characterised systematically with cryogenic PSA experiments similar to those used for the commercial materials (variable T, p, flow-rate and feed composition conditions plus cycling). The research outcomes will be the development of optimised materials and refined techniques for their synthesis, used to improve the design of LNG production trains and to treat contaminated gas reserves.
The removal of carbon dioxide (CO2) and nitrogen (N2) contamination is of particular interest in Australia, some of largest gas fields are not economically viable as they contain large amounts of CO2 and/or N2. The current process for the removal of CO2 is extremely expensive when concentrations are greater than 5%. Currently there is no conventional means to remove N2, as a result large amount of energy is wasted cooling the N2 to LNG temperature (–161 OC).