Sebastian Bannwarth

24 Aug 2012

Education and Work

2000 - 2001 - Social service in Santiago de Chile

2002 - 2003 - Pre-Diploma in process engineering, at the Technical University of Clausthal, Germany

2003 – 2010 - Diploma in mechanical engineering, field of study: process engineering

2000 - Internship at Quarzwerke

2002 - Internship at RWE power AG

2009 - Internship at Infraserv Knapsack, Germany

2011 - PhD, Institute of Chemical Process Engineering, RWTH Aachen University, Germany, research field: Membrane characterisation by impedance spectroscopy

Theses

1.student thesis: Disturbance prediction for wastewater treatment plant and sewage system control - a literature review

2.student thesis: Characterisation of polyamid membranes for reverse osmosis and nanofiltration with zeta potential measurements

3. diploma thesis: Biogas purification: Investigating a membrane-based process

Abstract

Siloxane removal using silicone-rubber membranes

The interest in using landfill and digester gas as a sustainable energry sources has grown. A major challenge using these sources is the precence of volatile methylsiloxanes (VMS). When a gas containing VMS is combusted silica deposits are formed. These deposits harm the  Siloxane removal using silicone-rubber membranescombustion engines and reduce their lifetime. State-of-the-art technology to remove the siloxanes from the gas is adsorption on activated carbon. Alternative methods are absorption, deep chilling or condensation. A new purification technology using membranes has now been tested. The permeabilities of common VMS in a commercially available polydimethylsiloxane (PDMS) membrane are determined as a function of temperature. A synthetic biogas mixture containing silicon in landfill gas-typical concentrations is purified in 3-end and 4-end operation. The results are presented using dimensionless numbers to facilitate upscaling. In general, PDMS can be used for siloxane removal, especially in 4-end operation using ambient air as sweep gas, where energy demand is significantly lower than in 3-end. However, depending on the desired degree of purification, methane losses of approximately 7% must be accepted. Only alternative membrane materials with higher carbon dioxide–methane selectivities have the potential for lower methane losses