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98413 MATERIALS SELECTION IN HYDROTHERMAL OXIDATION PROCESSES

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Product Number: 51300-98413-SG
ISBN: 98413 1998 CP
Author: Saadedine Tebbal, Russell D. Kane
Industry: Materials Selection and Design
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Results of a literature and an experience survey on materials selection in subcritical and supercritical water oxidation processes are presented in this paper. Some hydrothermal process environments with moderate pH levels and low levels of reactive halide ions were mild enough to allow the use of AISI 316 and similar stainless alloys. The engineering alloys most commonly utilized in hydrothermal oxidation processes were found to be alloys C-276 and 625. However, the corrosivity in some environments appeared to be beyond the limits of alloys C-276 and 625 and required materials with higher corrosion resistance. Titanium alloys such as T1-Gr2, Ti-Gr9 and Ti-Gr12 had value in terms of their corrosion resistance under some cases of highly oxidizing conditions. For severe applications, noble metals such as Pt, Pt-Ir and Pt-Rh were used as liners and overlays to minimize corrosive attack, Newer developed alloys such as alloy C-4, C-22, 59,686 and C-2000 haven’t yet been evaluated in hydrothermal oxidation process environments, In addition to materials selection, design imovations were used to minimize condhions for corrosive attack in process equipment. Keywords: Supercritical Water Oxidation, Subcritical Water Oxidation Hydrothermal Oxidation, H2 Temperature Corrosion Materials Selection.
Results of a literature and an experience survey on materials selection in subcritical and supercritical water oxidation processes are presented in this paper. Some hydrothermal process environments with moderate pH levels and low levels of reactive halide ions were mild enough to allow the use of AISI 316 and similar stainless alloys. The engineering alloys most commonly utilized in hydrothermal oxidation processes were found to be alloys C-276 and 625. However, the corrosivity in some environments appeared to be beyond the limits of alloys C-276 and 625 and required materials with higher corrosion resistance. Titanium alloys such as T1-Gr2, Ti-Gr9 and Ti-Gr12 had value in terms of their corrosion resistance under some cases of highly oxidizing conditions. For severe applications, noble metals such as Pt, Pt-Ir and Pt-Rh were used as liners and overlays to minimize corrosive attack, Newer developed alloys such as alloy C-4, C-22, 59,686 and C-2000 haven’t yet been evaluated in hydrothermal oxidation process environments, In addition to materials selection, design imovations were used to minimize condhions for corrosive attack in process equipment. Keywords: Supercritical Water Oxidation, Subcritical Water Oxidation Hydrothermal Oxidation, H2 Temperature Corrosion Materials Selection.
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Product Number: 51300-04233-SG
ISBN: 04233 2004 CP
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Publication Date: 2004
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Sulfuric acid is one of the most important elementary substances of the chemical industry.  There is no stainless steel or even a nickel base alloy available which is suitable over the entire concentration range.  This paper will give corrosion data in up to 75 % sulfuric acid at boiling temperature for various commercial grades as well as for some new developmental alloys.
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