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The selection of containment materials for the decomposition of sulphuric acid, by direct heating with air (CRISTINA process) was made by using information from the literature or by experimental investigation. Commercial materials having a reasonable corrosion resistance were identified for each process step. An allowance for the effect of corrosion was made in the design of the plant built at the JRC-Ispra (CHRIS plant). After dismantling of the CHRIS plant, the materials used were examined visually and by the use of metallographic and X-ray diffraction techniques. The results of this exercise are critically reviewed with the aim of facilitating the choice of materials for a pilot plant. The results indicated the operational time of the CHRIS plant was too short to allow an extrapolation of corrosion rates to long term runs. No problem was encountered with the SO(3) decomposition tower as the corrosive attack on the wall of the Incoly 500 basket was low. The most critical point was the high temperature heat exchanger where the maximum depth on internal penetration (130microm) was found. The surface exposed to SO(3)-rich atmosphere was also corroded at lower temperatures.

Additional information

Authors: COEN-PORISINI F, JRC Ispra Estab. (IT)
Bibliographic Reference: Article: International Journal of Hydrogen Energy, Vol. 14 (1989), No. 4, pp. 267-274
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