OCR Text |
Show RESULTS AND DISSCUSION Figure 2 . shows the mass losses of the P.S. with the decomposit ion time and with the pyrolysis temperature , respectively. The decompo sition time was about 3 mins and the range of the decomposition temperature of the 0.1 gram P. S. was 3500e to 4500e v.'hen was pyrolysed with 0 .1 KL /min nitrogen supplied. From the benzene, toluene, ethylbenzene, p-xylene, m-xylene,styrene , 1. 3 . 5- trim eth yl benzene, 1, 2,4- trim eth yl be nzene , p- is opr 0 pylt 0 1 u e n e , n -butylbenzene and naphthalene analyses of the emitted gas in the thermal decomposition process, it was found that ethylbenzene, xylene, 1,3,5- trim eth ylbenzene, 1,2,4-trimethylbenzene, p-isopropyltoluene formed very less. Only the for mat ion 0 f s t yr e new ash i g her in qua n tit Y \\I' it han a v era g e concentration of about 12 .9 mg/I. The formation of naphthalene and toluene were lower, but formation of the other compounds was much 10\\1' er still. These results indicate that P. S. in the stage-one incineration proce ss melted and gasified and the long chain of polymer structure was broken to a shorter chain of polymer structure , a monomer(styrene) and toluene . 'Because the thermal temperature was controlled at the lower temperature of 3500e -- 5000e, there \\I' as not eno ugh energy for the po lys t yre n e compound to be effectively decomposed and to form CH4" C2H2 " C6H6 and so on. When the P.S. was decomposed at temperatures of 800 --12000e in the stage-two incinerator, the formation of benzene, toluene, styrene ,n -butylbenzene and naphthalene were shown in Figure 3. The form ation of styrene,toluene and n-butylbenzene were decreased as the stage-two temperature increased. The formation of benzene and naphthalene appeared the maximun concentration at 900ce of the stage-two. temperature . At 800 °e, the concentration of benzene was less than 1.58 mg/I. When the temperature was increased to 9000e, the prouduct of benzene was increased with the average concentration of 2 .4 mg/l (753 .8 ppm ). Howe ver , the - 7 |