Destruction of chlorobenzene and carbon tetrachloride in a two-stage molten salt oxidation reactor system

Yang, Hee-Chul; Cho, Yong-Jun; Eun, Hee-Chul; Kim, Eung-Ho

doi:10.1016/j.chemosphere.2008.03.045

Cited by 22 publications

(13 citation statements)

References 8 publications

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“…Molten salt oxidation (MSO) is a flameless thermal process with the inherent capability of efficiently destroying organic constituents in waste and retaining the inorganic constituents in the salt bath (Hsu et al, 2000; Yao et al, 2011). The molten salts not only supply a renewing gas–liquid interface between the reactants (Jin et al, 2005), but also offer a reaction environment with uniform temperature and stable heat transfer (Yang et al, 2008); the molten carbonates can also scrub out the acid gases contained in the combustion gas bubbles (Flandinet et al, 2012; Hsu et al, 2000). There are many benefits of disposing high salt content organic hazardous wastes through MSO treatment, the most attractive being the ability to effectively destroy the organics in the wastes and avoid the negative effects of molten alkali salts during incineration.…”

Section: Introductionmentioning

confidence: 99%

Molten salt oxidation of organic hazardous waste with high salt content

et al. 2018

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Organic hazardous waste often contains some salt, owing to the widespread use of alkali salts during industrial manufacturing processes. These salts cause complications during the treatment of this type of waste. Molten salt oxidation is a flameless, robust thermal process, with inherent capability of destroying the organic constituents of wastes, while retaining the inorganic ingredients in the molten salt. In the present study, molten salt oxidation is employed for treating a typical organic hazardous waste with a high content of alkali salts. The hazardous waste derives from the production of thiotriazinone. Molten salt oxidation experiments have been conducted using a lab-scale molten salt oxidation reactor, and the emissions of CO, NO, SO, HCl and dioxins are studied. Impacts are investigated from the composition of the molten salts, the types of feeding tube, the temperature of molten carbonates and the air factor. Results show that the waste can be oxidised effectively in a molten salt bath. Temperature of molten carbonates plays the most important role. With the temperature rising from 600 °C to 750 °C, the oxidation efficiency increases from 91.1% to 98.3%. Compared with the temperature, air factor has but a minor effect, as well as the composition of the molten salts and the type of feeding tube. The molten carbonates retain chlorine with an efficiency higher than 99.9% and the emissions of dioxins are below 8 pg TEQ g sample. The present study shows that molten salt oxidation is a promising alternative for the disposal of organic hazardous wastes containing a high salt content.

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Section: Introductionmentioning

confidence: 99%

Molten salt oxidation of organic hazardous waste with high salt content

et al. 2018

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“…A halogenated solvent that consisted mostly of methyl chloroform was treated with a pilot-scale MSO system [59,90,92,95,96]. Eighty weight percent of the waste contained chlorine that with MSO treatment was captured as sodium chloride in the molten salt.…”

Section: General Chemical and Hazardous Waste Treatmentmentioning

confidence: 99%

“…The above two-stage reactor system was also used for the destruction of chlorobenzene and trichloroethylene [90,92,95], as well as carbon tetrachloride [96]. Various oxidation organic by-products and hydrogen chloride were produced in the primary reactor but destroyed or collected in the secondary MSO reactor.…”

Section: General Chemical and Hazardous Waste Treatmentmentioning

confidence: 99%

Scientific and Engineering Literature Mini Review of Molten Salt Oxidation for Radioactive Waste Treatment and Organic Compound Gasification as well as Spent Salt Treatment

Kovařík

Navratil

John

2015

Science and Technology of Nuclear Installations

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Literature review was performed for the molten salt oxidation technology in order to collect all available scientific and engineering information for further use of this technology in nuclear applications. This report provides a summary of a review of scientific and engineering literature on MSO treatment of a wide variety of radioactive wastes, organic compound gasification, and related studies such as radioactive spent salt processing that was found important for further development of the MSO technology in the nuclear field for radioactive waste treatment. Miscellaneous nonnuclear uses of molten salts, such as converting carbon monoxide to carbon dioxide, are not discussed.

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“…21 When the incineration in a gas phase is carried out, by-products containing halogens are emitted into the exhaust, which causes the formation of dioxins by recombination reaction. On the other hand, in the decomposition processes by using molten salts, halogens as acidic element react with alkaline molten salts and are trapped in a liquid phase.…”

Section: Introductionmentioning

confidence: 99%

Decomposition of Carbon Tetrachloride and Mono-Chlorobenzen by Using Basic Molten Salts

et al. 2012

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The decomposition of simple organic chlorides (carbon tetrachloride, CCl 4 and mono-chlorobenzen, C 6 H 5 Cl) as the imitation substances of polychlorobiphenyls (PCBs) were investigated by using basic molten salts with a low melting point and oxidizing ability in order to establish a safe, simple and highly efficient decomposition process. CCl 4 or C 6 H 5 Cl was injected together with an inert carrier gas (Ar) into basic molten salts (KOH-K 2 CO 3 ) at 673-983 K, and the residual concentration in the exhaust was measured. The decomposition efficiency of CCl 4 strongly depended on the reaction temperature and the immersion depth of gas injection nozzle (related to the residence time of CCl 4 bubble in the molten salts). The decomposition efficiency reached to very high of 99.9% with KOH-20 mol% K 2 CO 3 at 973 K. On the other hand, the decomposition efficiency of C 6 H 5 Cl was not so high (97%) in the inert atmosphere condition applied in this study.

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Destruction of chlorobenzene and carbon tetrachloride in a two-stage molten salt oxidation reactor system

Cited by 22 publications

References 8 publications

Molten salt oxidation of organic hazardous waste with high salt content

Molten salt oxidation of organic hazardous waste with high salt content

Scientific and Engineering Literature Mini Review of Molten Salt Oxidation for Radioactive Waste Treatment and Organic Compound Gasification as well as Spent Salt Treatment

Decomposition of Carbon Tetrachloride and Mono-Chlorobenzen by Using Basic Molten Salts

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