Techno-economic evaluation of biogas upgrading process using CO2 facilitated transport membrane

Abstract The biogas upgrading by membrane separation process using a highly efficient CO2-selective polyvinylamine/polyvinylalcohol (PVAm/PVA) blend membrane was investigated by experimental study and simulation with respect to process design, operation optimization and economic evaluation. This blend membrane takes advantages of the unique CO2 facilitated transport from PVAm and the robust mechanical properties from PVA, exhibits both high CO2/CH4 separation efficiency and very good stability. CO2 transports through the water swollen membrane matrix in the form of bicarbonate. CO2/CH4 selectivity up to 40 and CO2 permeance up to 0.55 m3(STP)/m2 h bar at 2 bar were documented in lab with synthesized biogas (35% CO2 and 65% CH4). Membrane performances at varying feed pressures were recorded and used as the simulation basis in this work. The process simulation of an on-farm scale biogas upgrading plant (1000 Nm3/h) was conducted. Processes with four different membrane module configurations with or without recycle were evaluated technically and economically, and the 2-stage in cascade with recycle configuration was proven optimal among the four processes. The sensitivity of the process to various operation parameters was analyzed and the operation conditions were optimized.

[1]  Richard Turton,et al.  Analysis, Synthesis and Design of Chemical Processes , 2002 .

[2]  J. Hao,et al.  Upgrading low-quality natural gas with H2S- and CO2-selective polymer membranes: Part II. Process design, economics, and sensitivity study of membrane stages with recycle streams , 2008 .

[3]  L. Robeson,et al.  Correlation of separation factor versus permeability for polymeric membranes , 1991 .

[4]  J. Hao,et al.  Upgrading low-quality natural gas with H2S- and CO2-selective polymer membranes: Part I. Process design and economics of membrane stages without recycle streams , 2002 .

[5]  S. A. Stern,et al.  Membrane processes for the removal of acid gases from natural gas. II. Effects of operating conditions, economic parameters, and membrane properties , 1993 .

[6]  George Skodras,et al.  Energy and capital cost analysis of CO2 capture in coal IGCC processes via gas separation membranes , 2004 .

[7]  May-Britt Hägg,et al.  CO2 Capture from Natural Gas Fired Power Plants by Using Membrane Technology , 2005 .

[8]  May-Britt Hägg,et al.  Techno-economic evaluation of a PVAm CO2-selective membrane in an IGCC power plant with CO2 capture , 2008 .

[9]  Robert Rautenbach,et al.  Gas permeation — module design and arrangement , 1987 .

[10]  S. A. Stern,et al.  Membrane processes for the removal of acid gases from natural gas. I. Process configurations and optimization of operating conditions , 1993 .

[11]  R. Baker Future directions of membrane gas separation technology , 2002 .

[12]  May-Britt Hägg,et al.  Polymeric facilitated transport membranes for hydrogen purification , 2006 .

[13]  A. A. Friedman,et al.  Performance of a bench-scale membrane pilot plant for the upgrading of biogas in a wastewater treatment plant , 1998 .

[14]  May-Britt Hägg,et al.  Facilitated transport of CO2 in novel PVAm/PVA blend membrane , 2009 .

[15]  May-Britt Hägg,et al.  Novel fixed-site–carrier polyvinylamine membrane for carbon dioxide capture , 2004 .

[16]  L. Robeson,et al.  The upper bound revisited , 2008 .

[17]  Saija Rasi,et al.  Trace compounds of biogas from different biogas production plants. , 2007 .