1 Institute of Chemical Engineering, Biotechnology and Environmental Technology, Faculty of Engineering, SDU2 Veolia Water SA, Percy St., Fourways 2055, South Africa3 Institute of Chemical Engineering, Biotechnology and Environmental Technology, Faculty of Engineering, SDU
A low pressure carbon molecular sieve (CMS) membrane based process to upgrade biogas from anaerobic digestion of agricultural waste to a substitute natural gas (SNG) has been tested on a pilot scale. The data extracted from the pilot plant was used to estimate membrane permeance and ideal selectivity of the CO2/CH4 gas pair. Four semi-commercial modules were tested. The results show that by using a membrane cascade and by carefully choosing the CMS modules, it is possible to produce a stream containing at least 90 vol-% CH4 and a by-product containing at least 60 vol-% CO2. The substituted natural gas can be mixed with NG in the national grid and the latter by-product is intended for the production of liquified CO2, suitable for use in greenhouses. At a pressure level of 8-16 barg, this process could offer simplicity and less investment and maintenance than other technologies.
Proceedings of European Congress of Chemical Engineering (ecce-6), 2007
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Proceedings of European Congress of Chemical Engineering (ecce-6)