摘要
利用热重分析仪(TGA)研究了低密度聚乙烯(LDPE)、液体石蜡(LP)及LDPE/LP共混物的热解特性,探讨了LDPE与LP在热解过程中的相互作用,进一步根据Coats-Redfern方法进行了反应动力学研究。结果表明,LDPE、LP及LDPE/LP共混物热解过程均符合一级反应动力学,LDPE/LP共热解反应活化能显著低于LDPE单独热解。为了验证LDPE和LP之间的协同效应,利用高压反应釜分别对LDPE、LP及LDPE/LP的共混物进行了热解研究。结果表明,LDPE与LDPE/LP共混物热解所得气体产物与液体产物组分相似,气体产物多为C1~C4的烷烃和烯烃,液体产物多为C5~C23的正构烷烃;LDPE/LP共热解所得液体产物中轻质烷烃组分(C5~C9)含量显著高于LDPE和LP单独热解,证实了LDPE和LP之间的协同作用。LP的加入改善了热解过程中的传质传热,抑制了LDPE单独热解时因局部过热而引起的结焦现象,促进了液体产物的轻质化。
Pyrolysis properties of low density polyethylene(LDPE),liquid paraffin(LP)and LDPE/LP mixture were investigated with TGA,and the interaction between LP and LDPE was discussed.The reaction kinetics was studied according to Coats and Redfern method.The pyrolysis of LDPE,LP and LDPE/LP mixture were found to be first order reaction,and the activation energy for pyrolysis of LDPE/LP mixture was obviously lower than that for LDPE.In order to further verify the synergistic effect between LDPE and LP,the pyrolysis of LDPE,LP and LDPE/LP were performed in a batch-type reactor.The results showed that pyrolysis products(gaseous and liquid products)from LDPE and LDPE/LP were basically similar.The gaseous products mainly contained C1~C4 alkanes and alkenes,while liquid products consisted of C5~C23 chain alkanes.The content of C5~C9 light alkanes in liquid product from pyrolysis of LDPE/LP mixtures is much higher than those from pyrolysis of LP and LDPE separately,demonstrating the synergistic effect between LDPE and LP.The introduction of LP can promote mass and heat diffusion,restrain coking caused by local overheating,and help to produce lighter liquid products.
作者
李江峰
丁世磊
李福威
赵婷婷
黄新媛
李翔
魏霄汉
王振麟
李志霞
LI Jiang-feng;DING Shi-lei;LI Fu-wei;ZHAO Ting-ting;HUANG Xin-yuan;LI Xiang;WEI Xiao-han;WANG Zhen-lin;LI Zhi-xia(School of Chemistry and Chemical Engineering,Guangxi University,Nanning 530004,China)
出处
《应用化工》
CAS
CSCD
北大核心
2019年第8期1781-1785,共5页
Applied Chemical Industry
基金
国家自然科学基金项目(21566004)
广西自然科学基金项目(2015GXNSFAA139036)
广西大学科研基金项目(XGZ120081,XTZ140787,XJPZ160713)
广西高校2018大学生创新创业训练计划项目(201810593185)
关键词
聚烯烃
低密度聚乙烯
液体石蜡
共热解
协同效应
polyolefin
low density polyethylene
liquid paraffin
co-pyrolysis
synergistic effect
