混合聚烯烃热裂解动力学建模  

Dynamics Modeling of Pyrolysis of Mixed Polyolefin

作　　者：丁飞[1,2,3] 张海荣[1,2] 罗彩容[1,2] 熊莲[1,2] 陈新德[1,2] 

机构地区：[1]中国科学院可再生能源与天然气水合物重点实验室,广东广州510640 [2]中国科学院广州能源研究所,广东广州510640 [3]中国科学院研究生院,北京100049

出　　处：《石油学报（石油加工）》2012年第5期821-826,共6页Acta Petrolei Sinica(Petroleum Processing Section)

基　　金：广东省自然科学基金(9451007006004075)资助

摘　　要：通过混合聚烯烃在633.15～673.15K、初始反应压力6.325kPa条件下的釜式热裂解实验,考察了反应温度和反应时间对裂解反应生成的产物分布的影响,并建立了四集总动力学模型,对聚烯烃制备高附加值产品的最佳工艺条件进行了优化。结果表明,利用该模型计算得到的产物分布与实验数据吻合较好,误差较小;混合聚烯烃裂解的总表观活化能为110.4kJ/mol,指前因子(A)为2.69×107 min-1,塑料添加剂的存在一定程度上降低了反应活化能。在653.15K下混合聚烯烃裂解反应40min,重组分收率最高,达到57.2%;在673.15K下混合聚烯烃裂解反应120min,中间组分收率最高,达到57.0%。这一研究结果可为废弃塑料热裂解制备高附加值产品提供理论指导。Pyrolysis of mixed polyolefin was carried out in an autoclave under the reaction temperatures of 633.15- 673.15 K, initial pressure of 6. 325 kPa. The influences of reaction temperature and time on the product distribution of polyolefin pyrolysis were investigated. A fourlump kinetic model was also established. Finally, the optimum process conditions were found to obtain maximum yield of value-added products. The results showed that the four-lump kinetic model fit for the pyrolysis reaction of polyolefin. The results calculated by the kinetic model agreed well with experimental data. The overall activation energy and pre-exponential factor was estimated to be 110.4 kJ/mol and 2.69 × 10^7 min^-1 for the pyrolysis of mixed polyolefin. The apparent activation energy reduced in the presence of plastic additives. The heavy fractions yield could reach its highest value of 57.2%, when the mixed polyolefin was pyrolyzed at 653.15 K for 40 min, and the middle distillate yield was up 57.0%, when the mixed polyolefin was pyrolyzed for 120 min at 673.15 K. The conclusions can provide theoretic direction for conversion of waste plastic to value-added products.

关 键 词：废弃塑料 聚烯烃 添加剂 热裂解 高附加值产品 动力学模型 

分 类 号：X783.2[环境科学与工程—环境工程]