Hazardous Waste Disposal by Supercritical Fluids

Bleyl, H.J.; Abeln, J.; Boukis, Ν.; Goldacker, H.; Kluth, Michael Friederich; Kruse, Andrea; Petrich, G.; Schmieder, H.; Wiegand, G.

doi:10.1080/01496399708003210

Cited by 14 publications

(11 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Supercritical water is also known to be capable of decomposing and oxidizing organic compounds such as alkanes, aromatics, and nitrogen‐containing compounds (Bleyl et al. ; Savage ), which elucidates the reduction in total C upon heating at 900 °C. This also accounts for the increase in the abundance of metallic Fe produced by the reduction of silicate FeO.…”

Section: Resultsmentioning

confidence: 99%

“…Water under high temperature and pressure conditions (above the critical point) has a reduced dielectric constant (from~80 to <10) which exhibits properties similar to organic solvent (Savage 1999;Katritzky et al 2001;Yabuta et al 2007;Aubrey et al 2008). Supercritical water is also known to be capable of decomposing and oxidizing organic compounds such as alkanes, aromatics, and nitrogencontaining compounds (Bleyl et al 1997;Savage 1999), which elucidates the reduction in total C upon heating at 900°C. This also accounts for the increase in the abundance of metallic Fe produced by the reduction of silicate FeO.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Heating experiments of the Tagish Lake meteorite: Investigation of the effects of short‐term heating on chondritic organics

Chan

Nakato

Kebukawa

et al. 2018

Meteorit & Planetary Scien

View full text Add to dashboard Cite

We present in this study the effects of short‐term heating on organics in the Tagish Lake meteorite and how the difference in the heating conditions can modify the organic matter (OM) in a way that complicates the interpretation of a parent body's heating extent with common cosmothermometers. The kinetics of short‐term heating and its influence on the organic structure are not well understood, and any study of OM is further complicated by the complex alteration processes of the thermally metamorphosed carbonaceous chondrites—potential analogues of the target asteroid Ryugu of the Hayabusa2 mission—which had experienced posthydration, short‐duration local heating. In an attempt to understand the effects of short‐term heating on chondritic OM, we investigated the change in the OM contents of the experimentally heated Tagish Lake meteorite samples using Raman spectroscopy, scanning transmission X‐ray microscopy utilizing X‐ray absorption near edge structure spectroscopy, and ultraperformance liquid chromatography fluorescence detection and quadrupole time of flight hybrid mass spectrometry. Our experiment suggests that graphitization of OM did not take place despite the samples being heated to 900 °C for 96 h, as the OM maturity trend was influenced by the heating conditions, kinetics, and the nature of the OM precursor, such as the presence of abundant oxygenated moieties. Although both the intensity of the 1s−σ* exciton cannot be used to accurately interpret the peak metamorphic temperature of the experimentally heated Tagish Lake sample, the Raman graphite band widths of the heated products significantly differ from that of chondritic OM modified by long‐term internal heating.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Heating experiments of the Tagish Lake meteorite: Investigation of the effects of short‐term heating on chondritic organics

Chan

Nakato

Kebukawa

et al. 2018

Meteorit & Planetary Scien

View full text Add to dashboard Cite

show abstract

“…Sludges from municipal wastewater treatment facilities have also been treated. [108][109][110][111] SCWO produces a clear and odorless aqueous effluent and a settlable ash. Thus it offers a tremendous reduction in the mass or volume of the original sludge in a single unit operation.…”

Section: Technology Developmentsmentioning

confidence: 99%

Organic Chemical Reactions in Supercritical Water

1999

View full text Add to dashboard Cite

“…Such extremely corrosive conditions are found during the process of supercritical water oxidation (SCWO) of chlorinated organic wastes, which are oxidized rapidly to carbon dioxide (CO 2 ), water (H 2 O), and HCl. 1 The released HCl with the surplus oxygen is responsible for the high corrosion rates in SCWO plants. Certainly, the highest rates of general corrosion are not observed in low-density supercritical aqueous solutions (T > 374°C; pressure [p] > 22.1 MPa), but in the dense subcritical solutions at ~ 350°C at a pressure of 24 MPa.…”

Section: Introductionmentioning

confidence: 99%

“…Ni-Cr-Mo Alloy 625 (UNS 06625) (1) and pure chromium are known to be resistant to oxidizing environments at room temperature, even in the presence of chlorides. Nevertheless, Alloy 625 is attacked heavily by high-temperature solutions, especially in the presence of hydrochloric acid (HCl) and oxygen.…”

Section: Introductionmentioning

confidence: 99%

Transpassive Dissolution of Alloy 625, Chromium, Nickel, and Molybdenum in High-Temperature Solutions Containing Hydrochloric Acid and Oxygen

Kritzer¹,

Boukis²,

Dinjus³

2000

CORROSION

Self Cite

View full text Add to dashboard Cite

Coupons of nickel, molybdenum, chromium, and the nickelbased Alloy 625 (UNS 06625) were corroded in strongly oxidizing hydrochloric acid (HCl) solutions at 350°C and a pressure (p) of 24 MPa, with reaction times between 0.75 h and 50 h. For Alloy 625, the effect of surface roughness also was investigated. Nickel and molybdenum showed strong material loss after only 5 h of reaction as a result of the instability of the solid oxides formed under experimental conditions. The attack on chromium started at the grain boundaries. At longer reaction times, thick, spalling oxide layers formed on the surface. The attack on Alloy 625 also started at the grain boundaries and at inclusions leading to the formation of small pits. On polished surfaces, the growth of these pits occurred faster than on nonpolished surfaces, but fewer pits grew. Corrosion products formed at the surface consisted of oxygen and chromium. On isolated spots, nickel-and chlorine-containing products also were found.

show abstract

Hazardous Waste Disposal by Supercritical Fluids

Cited by 14 publications

References 10 publications

Heating experiments of the Tagish Lake meteorite: Investigation of the effects of short‐term heating on chondritic organics

Heating experiments of the Tagish Lake meteorite: Investigation of the effects of short‐term heating on chondritic organics

Organic Chemical Reactions in Supercritical Water

Transpassive Dissolution of Alloy 625, Chromium, Nickel, and Molybdenum in High-Temperature Solutions Containing Hydrochloric Acid and Oxygen

Contact Info

Product

Resources

About