摘要
研究了废轮胎热解产生的三相 (气、液、固 )产率与裂解温度的关系 ,气相组成与温度的关系 ,以及氢氧化钠作为催化剂加入热解体系对三相产率和气体组成的影响 .实验表明 ,轮胎橡胶的热稳定性分为 :～ 2 0 0℃ ,2 0 0℃～ 30 0℃及 30 0℃以上 3个区域 .在 2 0 0℃以上时 ,随着温度升高 ,固体产率减少 ,气体产率增加 ,液体产物的产率在 50 0℃左右出现一个峰值 .加入 4%Na OH作催化剂以后 ,在相同的温度下固态碳黑和液态油的产率均有所提高 ,而相应混合气的产率降低 .实验确定了所用混合胶粉主要为合成橡胶 .不同温度下热解所产生的液体产物的红外谱图及裂解色谱图表明 ,30 0℃时主要是助剂分解 ,40 0℃左右主要是聚异戊二烯 (天然胶 )开始裂解 ,60 0℃以上残留物开始裂解 .
The effects of temperature on the yields of solid,liuid and gas produced in the pyrolysis process,the effects of temperature on the concentration of gas constitutes,and the effects of NaOH(as catalyst) on the yields of soild,liquid and gas and on the concentration of gas constitutes,were studied in detail.The experiments showed that there were three stable temperature regions for the tire rubber,i.e., below 200℃,200℃～300℃ and over 300℃.When temperature increases over 200℃,the solid yield decreased;the gas yield increased;but the liquid yield presented a peak at 500℃.A 4% NaOH solution was added as catalyst into the waste tire.At the same temperature,the yields of solid (charcoal) and liquid (oil) increased but the yield of gas decreased.The sample for experiments was demonstrated to be mainly the synthetic rubber.The chromatograms and infrared spectrums of the liquid produced in the pyrolysis process at different temperature showed that assistant agents in the waste tire crackled in 300℃,the nature rubber crackled in 400℃ and the residue began to crackle above 600℃.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2000年第6期85-88,共4页
Environmental Science
