摘要
以聚烯烃塑料为裂解原料,在间歇反应釜中进行轻度热裂解,加热速率3—5℃/min,温度400℃,停留时间0—80 min;制取液相石油烃。为克服热裂解过程中的传热不均匀,提高热裂解产物轻质馏分的含量,进行了部分热裂解产物返回作为原料与聚烯烃塑料进行共裂解的实验探究,并对其裂解气相产物进行了气相色谱分析,液相产物进行了红外光谱、核磁共振氢谱表征以及GC-MS定量分析。结果表明:在400℃进行共裂解,液相产物平均收率约为90%,所得液相石油烃C数分布广,主要组分为链烷烃,其中直链烷烃所占比例44.03%。在聚烯烃塑料轻度裂解过程中部分热裂解产物返回共裂解,有利于裂解过程的传热,促进所得石油烃的轻质化且裂解过程中不会发生结焦反应。但共裂解液相产物中离心沉积物增多,主要组成为链烷烃,可作为裂解原料再次进行利用。
Liquid hydrocarbons were produced by cracking of polyolefins under mild conditions in a closed batch reactor. In order to promote the heat transfer in the process of thermal cracking and improve the light fraction content of cracking products, the co-cracking of products （ liquid hydrocarbons） and HDPE/PP were investigated in the condition of temperature 400 ℃, heating rate 3-5 ℃/min and residence time 0-80 min. The cracking products were grouped into the lumps of gas and liquid hydrocarbons. The gas products were analyzed by GC. The liquid products were divided into supernatant liquid and sediment by centrifugal separation, which were characterized using FT-IR, 1H-NMR and GC-MS. The results show that the average yield of liquid hydrocarbons is about 90%. Co-cracking of polyolefins generated almost n-paraffins over a wide range of C number, and most of which （44. 03% ） collected as normal-alkanes. The results also indicate that the co-cracking of liquid hydrocarbons and HDPE/PP can promote the heat transfer and improve the quality of the liquid products and no-coking. There is a significant increasing in the sediment fraction, which can also be feedstock for subsequent cracking. It concludes that the products of the mild cracking and co-cracking of polyolefin can be applied as petrochemical feedstocks.
出处
《化学工程》
CAS
CSCD
北大核心
2015年第1期55-60,共6页
Chemical Engineering(China)
基金
多相复杂系统国家重点实验室资助项目(MPCS-2012-A-01)
关键词
聚烯烃
轻度热裂解
共裂解
石油烃
polyolefins
mild cracking
co-cracking
liquid hydrocarbons
