Membrane-based removal of volatile methylsiloxanes from biogas

  • Membranbasierte Abtrennung von flüchtigen Methylsiloxanen aus Biogas

Ajhar, Marc; Wessling, Matthias (Thesis advisor)

Aachen : Publikationsserver der RWTH Aachen University (2012)
Dissertation / PhD Thesis

Aachen, Techn. Hochsch., Diss., 2011


This work investigates the removal of volatile methylsiloxanes (VMS) from biogas using dense, rubbery membranes. It consists of the following:a) thorough overview of already established and still developing siloxane removal technologies,b) detailed investigation of a viable sampling and analytical method,c) screening of different elastomers to identify siloxane-selective membrane materials,d) design of a suitable membrane structure, i.e. theoretical considerations about the thicknesses of the active separation layer and the porous support layer,e) assessment of the siloxane separation performance of a silicone membrane module using both synthetic gas under laboratory conditions and real landfill gas,f) comparison between the state-of-the-art technology (adsorption on activated carbon) and membrane-based processes.Suitable polymers for siloxane removal from biogas exist, however, they are not commercially available as membranes. Among the elastomers studied, Pebax®2533 is particularly promising. The use of a membrane made of this material could potentially become new state-of-the-art technology.