JOURNAL BROWSE
Search
Advanced SearchSearch Tips
Decomposition of PVC and Ion Exchange Resin in Supercritical Water
facebook(new window)  Pirnt(new window) E-mail(new window) Excel Download
 Title & Authors
Decomposition of PVC and Ion Exchange Resin in Supercritical Water
Kim Jung-Sung; Lee Sang-Hwan; Park Yoon-Yul; Yasuyo Hoshikawa; Hiroshi Tomiyasu;
  PDF(new window)
 Abstract
This study introduces the development of new supercritical water oxidation(SCW)(multiple step oxidation) to destruct recalcitrant organic substances totally and safely by using sodium nitrate as an oxidant. This method has solved the problems of conventional SCW, such as precipitation of salt due to lowered permittivity, pressure increase following rapid rise of reaction temperature, and corrosion of reactor due to the generation of strong acid. Destruction condition and rate in the supercritical water were examined using Polyvinyl Chloride(PVC) and ion exchange resins as organic substances. The experiment was carried out at for 30min, which is relatively lower than the temperature for supercritical water oxidation . The decomposition rates of various incombustible organic substances were very high [PVC, Anion exchange resin, Cationexchange resin]. It was observed that hetero atoms existed in organic compounds and chlorine was neutralized by sodium (salt formation). However, relatively large amount of sodium nitrate (4 equivalent) was required to raise the decomposition ratio. For complete oxidation of PCB was intended, the amount of oxidizer was an important parameter.
 Keywords
Polyvinyl Chloride(PVC);Ion exchange resin;Supercritical water;Oxidation;Nitrate;Nitrite;
 Language
English
 Cited by
 References
1.
Tadeshi, S., S. Tsutomu and H. Masaru, 1997, Decomposition of Dioxins in Fly Ash with Supercritical Water Oxidation, J. of Chem. Eng. of Japan, 30(4), 744-746 crossref(new window)

2.
Casal, V. and H. Schmidt, 1998, SUWOX-a facility for the destruction of chlorinated hydrocarbons, J. of Supercritical Fluids, 13(1-3), 269-276 crossref(new window)

3.
Takada, M., R. Uchida, S. Taniguchi and M. Hosomi, 1997, Chemical dechlorination of PCBs by the base catalyzed decomposition process, Organohalogen Compounds, 31, 435-440

4.
Taniguchi, S., A. Murakami, M. Hosomi, A. Miyama and R. Uchida, 1997, Chemical decontamination of PCB-contained soil, Chemosphere, 34, 5-7

5.
Taniguchi, S., A. Miyama, A. Ebihara, M. Hosomi and A. Murakami, 1998, Treatment of PCB-contained soil in a pilot-scale continuous decomposition system, Chemosphere, 37(9/12), 2315-2326 crossref(new window)

6.
DeMarini, D. M., V. S. Houk, A. Kornel and C. J. Rogers, 1992, Effect of a base-catalyzed dechlorination process on the genotoxicity of PCB-contaminated soil, Chemosphere, 24(12), 1713-1720 crossref(new window)

7.
Savage, P. E., 1999, Organic chemical reactions in supercritical water, Chemical Review, 99(2), 603-621 crossref(new window)

8.
Armellini, F. J. and J. W. Tester, 1993, Solubility of sodium chloride and sulfate in sub-and supercritical water vapor from 450-$550^{\circ}C$ and 100-250 bar, Fluid Phase Equilibria, 84, 123-142 crossref(new window)

9.
Cui, S. T. and J. G. Harrs, 1995, Solubility of sodium chloride in supercritical water a molecular dynamics study, J. of Physical Chemistry, 99(9), 2900-2906 crossref(new window)

10.
Dhawan, J. C., R. C. Legendre, A. F. Bencsath and R. M. Davis, 1991, Reaction products of styrene-butadiene ABA Block Copolymer in Supercritical Toluene and Tetralin, J. Supercrit. Fluids, 4, 160-163 crossref(new window)

11.
Muthukumaran, P. and R. B. Gupta, 2000, Sodium-carbonatede-assisted supercritical water oxidation of chlorinated waste, Industrial & Engineering Chemistry Research, 39(12), 4555-4563 crossref(new window)

12.
Park, K. C. and H. Tomiyasu, 2003, Gasification reaction of organic compounds catalyzed by $RuO_{2}$ in supercritical water, Chemical communications, 694-695

13.
Li, D. and B. Han, 2000, Phase Behavior of Supercritical $CO_{2}$/Styrene/Poly-(vinyl chloride) System and Synthesis of Polystyrene/Poly(vinyl chloride) Composites, Macromolecules, 33, 4555-4560 crossref(new window)

14.
Downey, K. W., R. H. Snow, D. A. Hazlebeck and A. Roberts, 1995, Corrosion and chemical agent destruction, Research on supercritical water oxidation of hazardous military wastes, In Innovations in Supercritical Fluids, Hutchenson, K. W.; Foster, N. R., Ed.; American Chemical Society Symposium Series 608; American Chemical Society, Washington D.C., 313-326