Study on interaction between plastic with wax (heavy oil) in process of catalytic co-pyrolysis

doi:10.11949/0438-1157.20190114

Abstract

Abstract:

Low density polyethylene (LDPE) and paraffin wax (WAX) were used as model compounds for plastics and heavy oils respectively. HZSM-5 was used as the reaction catalyst. The pyrolysis characteristics and kinetic analysis were carried out by thermogravimetric experiments. In product distributions respect, the influence of the co-pyrolysis interaction was discussed by individual pyrolysis of feedstock and co-pyrolysis at different ratios using fixed bed reactor. The results showed that, there was a strong interaction between LDPE and WAX, which accelerated the rate of mass loss and decreased the characteristic degradation temperature and the apparent activation energy. For pyrolysis products, the selectivity of light oil (C_21-) and aromatics were increased, and the selectivity of heavy oil (C₂₁₊) and the yield of solid residues were reduced. Moreover, it was found that the interaction could be enhanced by the increase of WAX content. The results of material balance calculation based on model compounds preliminarily validated that there were practical feasibility and technological advantages to produce high-quality fuel oil by catalytic co-pyrolysis of plastic with its cracking heavy oil.

Key words: plastic, heavy oil, pyrolysis, interaction, catalysis, waste treatment

摘要：

采用低密度聚乙烯（LDPE）和固体石蜡（WAX）分别作为塑料及重油的模型化合物，以HZSM-5为反应催化剂，通过热重实验进行热解特性及动力学分析，研究了二者在热解行为上的相互作用；并结合固定床反应器对比研究单独热解及不同原料配比下共热解的产物分布，考察了共热解过程相互作用对热解产物的影响规律。结果表明，LDPE与WAX共热解过程二者间相互作用增强，表现为促进反应物的热解失重，降低了原料的特征热分解温度及反应活化能，显著提高了热解油中C_21-轻油馏分及芳烃的选择性，而油中C₂₁₊重油馏分的选择性及固体残渣产率均降低；而且随着共热解原料中WAX比例的增加二者间的相互作用不断增强；基于模型化合物水平初步验证了塑料与裂解重油共热解制备高品质轻质燃油工艺的可行性与技术优势。

关键词: 塑料, 重油, 热解, 相互作用, 催化, 废物处理

CLC Number:

X 705

Dongxue YU, Helong HUI, Jingdong HE, Songgeng LI. Study on interaction between plastic with wax (heavy oil) in process of catalytic co-pyrolysis[J]. CIESC Journal, 2019, 70(8): 2971-2980.

于冬雪, 惠贺龙, 何京东, 李松庚. 塑料与蜡（重油）催化共热解相互作用研究[J]. 化工学报, 2019, 70(8): 2971-2980.

Figures/Tables 11

Fig.1 Technological process of catalytic co-pyrolysis of plastic and heavy oil to produce fuel oil

Fig.2 Schematic diagram of fixed-bed reactor

Fig.3 TGA and DTG curves of LDPE, WAX and their mixture

Fig.4 Variation of ΔW for co-pyrolysis of LDPE and WAX

Fig.5 Kinetic curves of LDPE, WAX and their mixture

Table 1 Kinetic parameters of LDPE, WAX and their mixture

Parameter	Catalyst			No-catalyst
Parameter	LDPE	WAX	LDPE/WAX	LDPE	WAX	LDPE/WAX
E _a/(kJ/mol)	88.33	64.22	48.75	96.63	81.18	63.87
R ²	0.98	0.98	0.98	0.97	0.99	0.98

Fig.6 Product distributions for pyrolysis of LDPE, WAX and their mixtures

Fig.7 Gas product composition distributions for pyrolysis of LDPE, WAX and their mixtures

Fig.8 Oil product carbon number distributions for pyrolysis of LDPE, WAX and their mixtures

Fig.9 Oil product composition distributions for pyrolysis of LDPE, WAX and their mixtures

Fig.10 Material balance calculations in catalytic co-pyrolysis systems for production of fuel oil by LDPE and its derived heavy oil

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