煤渣催化聚苯乙烯泡沫塑料热解的研究

Study on Thermal Cracking of Wasted Expanded Polystyrene Catalyzed by Cinder

选择煤渣作为催化剂,对废弃聚苯乙烯进行热解回收,通过气相色谱分析确定热解产物。结果表明:升温速度、热解温度对苯乙烯收率有一定影响,慢速升温且热解温度为380℃时,液体溜分中苯乙烯的含量最高,达到63%;与其他催化剂比较,煤渣催化的产物收率更高。常压下,催化剂用量超过8%后,液体产物的收率保持在89%不再增加;作为燃煤设备所排出的废渣,煤渣质轻、比表面大,主要化学成分为SiO2、Al2O3、Fe2O3和CaO。煤渣催化属于废物再用,不存在因催化剂中毒而浪费资源的问题;裂解残留物经过简单处理、无需分离就可用作路基通孔渗水材料。

Cinder was used as a catalyst for recycling expanded polystyrene （EPS） in this paper. As waste from coal-fired equipment, cinder has the characteristics of light quality and large ratio surface area. The main chemical components of cinder were SiO2, Al2O3, Fe2O3, and CaO. Using wasted cinder as catalyst had no waste of resources due to catalyst-poisoning. After simple processing, the cracking residues can be reused as roadbed through-hole materials. The cracking products of EPS were analyzed by gas chromatography. Compared with other catalysts, the cindercatalyzed yield of cracking products was higher. Under atmospheric pressure, when the amount of catalyst was over 8 %, a highest liquid yield （89 %） was obtained. Cracking temperature and heating rate had influence on the yield of styrene. Heating slowly at 380 ℃, the content of styrene in liquid products was the highest （63 %）.