Study on the Co-Pyrolysis Characteristics of Lignin and High-Density Polyethylene
SU De-ren1, WANG Ya-zhuo2,3,5, FAN Hong-gang2,4, GU Jing2,3,5
1. Guangdong Fengle Energy Technology Co., Ltd., Guangzhou 511300, China; 2. Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China; 3. Dongguan Zhongke Mianyuan Environmental Protection Technology Co., Ltd., Dongguan 523000, Guangdong, China; 4. University of Chinese Academy of Sciences, Beijing 100049, China; 5. Foshan Kehengbo Environmental Protection Technology Co., Ltd., Foshan 528225, Guangdong, China
Abstract：The co-pyrolysis of biomass and plastics is one of the most effective methods of biomass utilization, while the mechanism of the co-pyrolysis process is still unclear due to the complexity of the biomass structure. In this work, the co-pyrolysis process of lignin (one of the main components of biomass) and high-density polyethylene was studied by thermogravimetric mass spectrometer and pyrolysis-gas chromatography coupled to mass spectrometer. The co-pyrolysis characteristics and pyrolysis product distribution were obtained, and the mechanism of co-pyrolysis process was also proposed. The results showed that a synergistic effect existed in the co-pyrolysis process of lignin and high-density polyethylene, which accelerated the rate of weight loss and reduced the content of pyrolysis solid residues. And the co-pyrolysis process was conducive to the formation of CH4, H2O, CO and C2H4, while inhibited the formation of CO2. At the same time, the yields of oxygenated compounds such as phenols, alcohols and sugars decreased, and the yields of alkanes and alkenes increased. The above results indicated that hydrogen transfer could occur in the co-pyrolysis process, and hydrogen would react with the lignin-derived pyrolysis products, thereby inhibiting the generation of oxygenated compounds and promoting the production of alkanes and alkenes.
苏德仁, 王亚琢, 范洪刚, 顾菁. 木质素与高密度聚乙烯共热解特性研究[J]. 新能源进展, 2020, 8(6): 462-469.
SU De-ren, WANG Ya-zhuo, FAN Hong-gang, GU Jing. Study on the Co-Pyrolysis Characteristics of Lignin and High-Density Polyethylene. Advances in N&R Energy, 2020, 8(6): 462-469.
SAFAR M, LIN B J, CHEN W H, et al.Catalytic effects of potassium on biomass pyrolysis, combustion and torrefaction[J]. Applied energy, 2019, 235: 346-355. DOI: 10.1016/j.apenergy.2018.10.065.
[2]
HAMEED S, SHARMA A, PAREEK V, et al.A review on biomass pyrolysis models: kinetic, network and mechanistic models[J]. Biomass and bioenergy, 2019, 123: 104-122. DOI: 10.1016/j.biombioe.2019.02.008.
[3]
WANG L Z, CHAI M Y, LIU R H, et al.Synergetic effects during co-pyrolysis of biomass and waste tire: a study on product distribution and reaction kinetics[J]. Bioresource technology, 2018, 268: 363-370. DOI: 10.1016/j.biortech.2018.07.153.
[4]
DHYANI V, BHASKAR T.A comprehensive review on the pyrolysis of lignocellulosic biomass[J]. Renewable energy, 2018, 129: 695-716. DOI: 10.1016/j.renene.2017.04.035.
[5]
LU Q, LI W Z, ZHU X F.Overview of fuel properties of biomass fast pyrolysis oils[J]. Energy conversion and management, 2009, 50(5): 1376-1383. DOI: 10.1016/ j.enconman.2009.01.001.
[6]
CZERNIK S, BRIDGWATER A V.Overview of applications of biomass fast pyrolysis oil[J]. Energy & fuels, 2004, 18(2): 590-598. DOI: 10.1021/ef034067u.
[7]
GU J, FAN H G, WANG Y Z, et al.Co-pyrolysis of xylan and high-density polyethylene: product distribution and synergistic effects[J]. Fuel, 2020, 267: 116896. DOI: 10.1016/j.fuel.2019.116896.
[8]
TANG Z Y, CHEN W, CHEN Y Q, et al.Co-pyrolysis of microalgae and plastic: characteristics and interaction effects[J]. Bioresource technology, 2019, 274: 145-152. DOI: 10.1016/j.biortech.2018.11.083.
[9]
JIN Q M, WANG X B, LI S S, et al.Synergistic effects during co-pyrolysis of biomass and plastic: gas, tar, soot, char products and thermogravimetric study[J]. Journal of the energy institute, 2019, 92(1): 108-117. DOI: 10.1016/j.joei.2017.11.001.
[10]
KAI X P, LI R D, YANG T H, et al.Study on the co-pyrolysis of rice straw and high density polyethylene blends using TG-FTIR-MS[J]. Energy conversion and management, 2017, 146: 20-33. DOI: 10.1016/j.enconman. 2017.05.026.
[11]
BREBU M, UCAR S, VASILE C, et al.Co-pyrolysis of pine cone with synthetic polymers[J]. Fuel, 2010, 89(8): 1911-1918. DOI: 10.1016/j.fuel.2010.01.029.
[12]
ÖNAL E, UZUN B B, PÜTÜN A E. Bio-oil production via co-pyrolysis of almond shell as biomass and high density polyethylene[J]. Energy conversion and management, 2014, 78: 704-710. DOI: 10.1016/j.enconman.2013.11.022.
[13]
WANG S R, DAI G X, YANG H P, et al.Lignocellulosic biomass pyrolysis mechanism: a state-of-the-art review[J]. Progress in energy and combustion science, 2017, 62: 33-86. DOI: 10.1016/j.pecs.2017.05.004.
[14]
LIU Q, WANG S R, ZHENG Y, et al.Mechanism study of wood lignin pyrolysis by using TG-FTIR analysis[J]. Journal of analytical and applied pyrolysis, 2008, 82(1): 170-177. DOI: 10.1016/j.jaap.2008.03.007.
[15]
JIN W, SHEN D K, LIU Q, et al.Evaluation of the co-pyrolysis of lignin with plastic polymers by TG-FTIR and Py-GC/MS[J]. Polymer degradation and stability, 2016, 133: 65-74. DOI: 10.1016/j.polymdegradstab.2016.08.001.
[16]
COLLARD F X, BLIN J.A review on pyrolysis of biomass constituents: Mechanisms and composition of the products obtained from the conversion of cellulose, hemicelluloses and lignin[J]. Renewable and sustainable energy reviews, 2014, 38: 594-608. DOI: 10.1016/j.rser. 2014.06.013.
[17]
YUAN H R, FAN H G, SHAN R, et al.Study of synergistic effects during co-pyrolysis of cellulose and high-density polyethylene at various ratios[J]. Energy conversion and management, 2018, 157: 517-526. DOI: 10.1016/j.enconman.2017.12.038.
[18]
LIU X L, LI X X, LIU J, et al.Study of high density polyethylene (HDPE) pyrolysis with reactive molecular dynamics[J]. Polymer degradation and stability, 2014, 104: 62-70. DOI: 10.1016/j.polymdegradstab.2014.03.022.
2020, Vol. 8 
