HYDROGEN SEPARATION IN ADVANCED GASIFICATION PROCESS

AUTHOR/S M.I. Pistelli, D. Mirabile PAPER PRESENTED TO RFCS RFCR-CT-2006-00003 REFEREE E. Faraci, L. Di Sante, V. Ratto, P. Gimondo KIND OF RESEARCH Product

ABSTRACT

Although hydrogen selective membranes have been widely explored and are commercially available, their separation performances in the presence of pollutants at high temperature need an improvement. The research work has explored this argument by investigating, from one side, the problem of procedure preparation of suitable membranes to be applied in gasification process (in particular, activities were focused on the reduction of palladium amount, that has high impact on membrane cost) and, from the other side, their performance in different experimental conditions. Main results were:-          in view of an industrial application, steel supports are preferable respect to the ceramic ones, due to their minor fragility, -          it is necessary to realise a barrier between Pd/Ag and the stainless steel of the support in order to avoid metallic inter-diffusion,-          the superficial roughness of both support and barrier is essential to reduce thickness of Pd/Ag and, consequently, the cost of the membrane, -          the interaction between barrier and Pd/Ag is fundamental for obtaining a stable and manageable membrane, -          laboratory tests have shown a better performance of the micro-spheres membrane respect to the sintered one, although its selectivity have to be improved,-          simulation data (obtained with the developed mathematical model and use of Fluent®) have proved that, when the ratio between the membrane length and the total reactor length is higher than 0.4, the final part of the membrane is not efficaciously utilised.

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