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Integrated Design of Alternative Technologies for Bulk-Only Chemical Agent Disposal Facilities (2000) / Chapter Skim
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3 Supercritical Water Oxidation Process for the Treatment of VX Hydrolysate
Pages 12-16

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From page 12...
... The selection of appropriate MOCs is a key requirement for the successful treatment of VX hydrolysate by SCWO (see Finding 2 and Recommendation 2 of the SCWO report [NRC, 19981~. SCWO treatment of VX hydrolysate involves highly corrosive and erosive environments that change drastically as the hydrolysate passes through the reactor and its peripheral components (inlet, outlet, and pressure let-down 12 valves)
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From page 13...
... The results described in the General Atomics report can be summarized as follows (Jensen et al., 1999~: · platinum and Pt-20%Ir and Rh showed the least corrosion with no evidence of intergranular corrosion, suggesting them as prime candidates for MOCs Pt-10%Rh and Au-8%Pd exhibited intergranular attack as a corrosion mechanism platinum-plated coupons exhibited delamination in all but the quench zone, indicating that higher quality platinum plating or other liner materials will be necessary in zones where the coating components have complex shapes Ni-based steels, including Ni/Co alloys, showed much greater corrosion than the Pt alloys in zones other than the quench zone YSZ and MSZ ceramic coupons displayed coating
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From page 14...
... . spallation and corrosion in the reaction zones all metals and alloys except niobium exhibited little corrosion in the quench zone Corrosion rates of the platinum and Pt-based alloys ranged from 50-65 mils/year, based on micrographs revealing uniform recession (i.e., no intragranular attack)
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From page 15...
... Recommendation 3-la. The Army should develop criteria and a schedule for resolving design and operational issues raised in the 1998 report, Using Supercritical Water Oxidation to Treat Hydrolysate from VX Neutralization, that have not yet been resolved for supercritical water oxidation operation at Newport.
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From page 16...
... Systems must be designed to minimize leaks, plugging, and ruptures of the supercritical water oxidation reactor and associated plumbing and protective barriers. Secondary containment equipment will also be necessary, including safety systems for handling high-purity oxygen at high pressure, such as protection against downstream fires and explosions caused by contact between combustible materials (e.g., activated carbon)
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Key Terms

  • hydrolysate surrogate
  • supercritical water
  • water oxidation
  • carbon filtration
  • swec test

  • preliminary results
  • liner materials
  • scwo report
  • moc tests
  • quench zone

  • fabrication methods
  • critical issues
  • chemical agent
  • downstream components
  • percent sodium

  • treat hydrolysate
  • batch tests
  • using supercritical
  • design margin
  • continuous scwo

  • continuous operation
  • secondary containment
  • conservative design
  • coupon tests
  • mils thick

  • liner thickness
  • continuous coupon
  • moc testing
  • report claims
  • hastelloy pressure


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