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Membranes 2018, 8(4), 118; https://doi.org/10.3390/membranes8040118

Process Simulation and Cost Evaluation of Carbon Membranes for CO2 Removal from High-Pressure Natural Gas

Department of Chemical Engineering, Norwegian University of Science and Technology, NO 7491 Trondheim, Norway
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Received: 19 October 2018 / Revised: 22 November 2018 / Accepted: 27 November 2018 / Published: 30 November 2018
(This article belongs to the Special Issue New Advances in Membrane Technologies for CO2 Separation)
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Abstract

Natural gas sweetening is required to remove the acid gas CO2 to meet gas grid specifications. Membrane technology has a great potential in this application compared to the state-of-the-art amine absorption technology. Carbon membranes are of particular interest due to their high CO2/CH4 selectivity of over 100. In order to document the advantages of carbon membranes for natural gas (NG) sweetening, HYSYS simulation and cost evaluation were conducted in this work. A two-stage carbon membrane process with recycling in the second stage was found to be technically feasible to achieve >98% CH4 with <2% CH4 loss. The specific natural gas processing cost of 1.122 × 10−2 $/m3 sweet NG was estimated at a feed pressure of 90 bar, which was significantly dependent on the capital-related cost. Future work on improving carbon membrane performance is required to increase the competitiveness of carbon membranes for natural gas sweetening. View Full-Text
Keywords: natural gas; carbon membranes; CO2 removal; process simulation; cost estimation; methane loss natural gas; carbon membranes; CO2 removal; process simulation; cost estimation; methane loss
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Chu, Y.; He, X. Process Simulation and Cost Evaluation of Carbon Membranes for CO2 Removal from High-Pressure Natural Gas. Membranes 2018, 8, 118.

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