Process simulation and cost evaluation of carbon membranes for CO 2 removal from high-pressure natural gas

Yunhan Chu, Xuezhong He*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

Natural gas sweetening is required to remove the acid gas CO 2 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 CO 2 /CH 4 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% CH 4 with <2% CH 4 loss. The specific natural gas processing cost of 1.122 × 10 -2 $/m 3 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.

Original languageEnglish
Article number118
JournalMembranes
Volume8
Issue number4
DOIs
StatePublished - 1 Jan 2018

Keywords

  • CO2 removal
  • Carbon membranes
  • Cost estimation
  • Methane loss
  • Natural gas
  • Process simulation

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