Degradation of 4-chlorobiphenyl as a model compound of polychlorinated biphenyls with potassium carbonate in supercritical water in the presence or absence of copper(II) oxide

被引:3
作者
Akiyama, F [1 ]
机构
[1] Tohoku Univ, Inst Chem React Sci, Sendai, Miyagi 9808577, Japan
关键词
D O I
10.1246/nikkashi.2001.595
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
In order to investigate the degradation of polychlorinated biphenyl degradation of its model compound 4-chlorobiphenyl (4-CB) with potassium carbonate in supercritical water in the presence or absence of copper (II) oxide was investigated. The reactions were carried out using two sorts of autoclaves made of sus 316 or Hastelloy X. The autoclaves were pressurized at 4-1 MPa at room temperature and heated to 500 - 570 degreesC to give the pressure of the mixture at 35 - 38 MPa. It was revealed that 4-CB was completely decomposed and that most of chlorine atoms were converted to potassium chloride. A gas mixture of benzene, toluene, and methane was obtained at the total yield of 10% and 4-biphenylol was obtained in the yield of 5-33% depending on the reaction conditions. Carbon skeleton of 4-CB was converted to CO2 or HCO3- in the yield of 6-24% depending on the reaction conditions. Effect of addition of copper (II) oxide on the reaction was investigated to show that addition of copper (II) oxide brought about the increase of the yields of hydrocarbons, especially the yield of benzene at 500 degreesC. In addition to above stated products, water soluble and easily decomposable compounds were formed by the reactions in the present study.
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页码:595 / 599
页数:5
相关论文
共 23 条
[1]   Conversion of coals to gaseous products containing benzene as a main organic product by the reaction with copper(II) oxide and aqueous potassium carbonate solution [J].
Akiyama, F .
FUEL, 1998, 77 (12) :1385-1387
[3]  
ANJOH N, 1997, ENVIRON MANAGE, V33, P895
[4]   Ionizing radiation induced degradation of tetrachlorobiphenyl in transformer oil [J].
Chaychian, M ;
Silverman, J ;
Al-Sheikhly, M ;
Poster, DL ;
Neta, P .
ENVIRONMENTAL SCIENCE & TECHNOLOGY, 1999, 33 (14) :2461-2464
[5]   Dechlorination of polychlorinated biphenyls: A kinetic study of removal of PCBs from mineral oils [J].
De Filippis, P ;
Scarsella, M ;
Pochetti, F .
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, 1999, 38 (02) :380-384
[6]   Structure-dependent photocatalytic degradation of polychlorobiphenyls in a TiO2 aqueous system [J].
DeFelip, E ;
Ferri, F ;
Lupi, C ;
Trieff, NM ;
Volpi, F ;
diDomenico, A .
CHEMOSPHERE, 1996, 33 (11) :2263-2271
[7]   Removal of PCBs from mineral oils [J].
DeFilippis, P ;
Chianese, A ;
Pochetti, F .
CHEMOSPHERE, 1997, 35 (08) :1659-1667
[8]   BOROHYDRIDE, MICELLAR, AND EXCIPLEX-ENHANCED DECHLORINATION OF CHLOROBIPHENYLS [J].
EPLING, GA ;
FLORIO, EM ;
BOURQUE, AJ ;
QIAN, XH ;
STUART, JD .
ENVIRONMENTAL SCIENCE & TECHNOLOGY, 1988, 22 (08) :952-956
[9]   Catalytic dehydrohalogenation of polychlorinated biphenyls - Part II: Studies on a continuous process [J].
Forni, P ;
Prati, L ;
Rossi, M .
APPLIED CATALYSIS B-ENVIRONMENTAL, 1997, 14 (1-2) :49-53
[10]   CATALYTIC DECHLORINATION OF POLYCHLORINATED-BIPHENYLS [J].
LIU, YM ;
SCHWARTZ, J ;
CAVALLARO, CL .
ENVIRONMENTAL SCIENCE & TECHNOLOGY, 1995, 29 (03) :836-840