Molten waste plastic pyrolysis in a vertical falling film reactor and the influence of temperature on the pyrolysis products

doi:10.1016/j.cjche.2017.08.001

Chinese Journal of Chemical Engineering ›› 2018, Vol. 26 ›› Issue (2): 400-406.DOI: 10.1016/j.cjche.2017.08.001

• Energy, Resources and Environmental Technology • 上一篇下一篇

Molten waste plastic pyrolysis in a vertical falling film reactor and the influence of temperature on the pyrolysis products

Zechen Jin, Dezhen Chen, Lijie Yin, Yuyan Hu, Huangqing Zhu, Liu Hong

Thermal and Environmental Engineering Institute, Tongji University, Shanghai 200092, China

收稿日期:2017-03-29 修回日期:2017-08-02 出版日期:2018-02-28 发布日期:2018-03-16
通讯作者: Lijie Yin
基金资助:
Supported by the National Natural Science Foundation of China (51503154), Major Projects of China Water Pollution Control and Treatment Science and Technology (2017ZX07202005), and the Shanghai Municipal Science and Technology Commission Fund for improving the economy in the Yangtze River Delta region (12195811100).

Molten waste plastic pyrolysis in a vertical falling film reactor and the influence of temperature on the pyrolysis products

Zechen Jin, Dezhen Chen, Lijie Yin, Yuyan Hu, Huangqing Zhu, Liu Hong

Thermal and Environmental Engineering Institute, Tongji University, Shanghai 200092, China

Received:2017-03-29 Revised:2017-08-02 Online:2018-02-28 Published:2018-03-16
Contact: Lijie Yin
Supported by:
Supported by the National Natural Science Foundation of China (51503154), Major Projects of China Water Pollution Control and Treatment Science and Technology (2017ZX07202005), and the Shanghai Municipal Science and Technology Commission Fund for improving the economy in the Yangtze River Delta region (12195811100).

摘要/Abstract

摘要： Molten plastics are characterised with high viscosity and low thermal conductivity. Applying falling film pyrolysis reactor to deal with waste plastics can not only improve heat transfer efficiency, but also solve the flow problem. In this work, the pyrolysis process of molten polypropylene (PP) in a vertical falling film reactor is experimentally studied, and the influence of heating temperature on pyrolysis products is discussed. It has been found that with the temperature increases from 550℃ to 625℃, the yield of pyrolysis oil decreases from 74.4 wt% (±2.2 wt%) to 53.5 wt% (±1.3 wt%). The major compositions of the pyrolysis oil are C₉, C₁₂ and C₁₈, and β-scission reactions are predominant. The content of the light fraction C₆-C₁₂ of pyrolysis oil is 69.7 wt%. Compared with other pyrolysis reactors, the yield of oil from vertical falling film pyrolysis reactor is slightly higher than that from tubular reactor, equal to that from rotary kiln reactor, and slightly lower than that in medium fluidised-bed reactor.

关键词: Pyrolysis, Reactor, Molten plastic, Pyrolysis oil, Fractional condensation

Abstract: Molten plastics are characterised with high viscosity and low thermal conductivity. Applying falling film pyrolysis reactor to deal with waste plastics can not only improve heat transfer efficiency, but also solve the flow problem. In this work, the pyrolysis process of molten polypropylene (PP) in a vertical falling film reactor is experimentally studied, and the influence of heating temperature on pyrolysis products is discussed. It has been found that with the temperature increases from 550℃ to 625℃, the yield of pyrolysis oil decreases from 74.4 wt% (±2.2 wt%) to 53.5 wt% (±1.3 wt%). The major compositions of the pyrolysis oil are C₉, C₁₂ and C₁₈, and β-scission reactions are predominant. The content of the light fraction C₆-C₁₂ of pyrolysis oil is 69.7 wt%. Compared with other pyrolysis reactors, the yield of oil from vertical falling film pyrolysis reactor is slightly higher than that from tubular reactor, equal to that from rotary kiln reactor, and slightly lower than that in medium fluidised-bed reactor.

Key words: Pyrolysis, Reactor, Molten plastic, Pyrolysis oil, Fractional condensation

Zechen Jin, Dezhen Chen, Lijie Yin, Yuyan Hu, Huangqing Zhu, Liu Hong. Molten waste plastic pyrolysis in a vertical falling film reactor and the influence of temperature on the pyrolysis products[J]. Chinese Journal of Chemical Engineering, 2018, 26(2): 400-406.

参考文献

[1] http://data.stats.gov.cn.

[2] Y.B. Liu, X.B. Ma, D.Z. Chen, L. Zhao, G.M. Zhou, Copyrolysis characteristics and kinetic analysis of typical constituents of plastic wastes, Proc. CSEE 30(23) (2010) 56-61(in Chinese).

[3] B.K. Sharma, B.R. Moser, K.E. Vermillion, K.M. Doll, N. Rajagopalan, Production, characterization and fuel properties of alternative diesel fuel from pyrolysis of waste plastic grocery bags, Fuel Process. Technol. 122(3) (2014) 79-90.

[4] M. Karkri, Y. Jarny, P. Mousseau, Thermal state of an incompressible pseudo-plastic fluid and Nusselt number at the interface fluid-die wall, Int. J. Therm. Sci. 47(2008) 1284-1293.

[5] N. Mascarenhas, L. Mudawar, Investigation of eddy diffusivity and heat transfer coefficient for free-falling turbulent liquid films subjected to sensible heating, Int. J. Heat Mass Transf. 64(2013) 647-660.

[6] C. Shi, Q. Chen, T.C. Jen, W. Yang, Heat transfer performance of lithium bromide solution in falling film generator, Int. J. Heat Mass Transf. 53(15-16) (2010) 3372-3376.

[7] L. Zhang, H. Zheng, Y. Wu, Experimental study on a horizontal tube falling film evaporation and closed circulation solar desalination system, Renew. Energy 28(8) (2003) 1187-1199.

[8] D. La, M.D. Li, W. Qin, W.J. Li, Y.D. Li, Study on heat transfer characteristics of falling film evaporation process, Appl. Energ. Technol. 5(2006) 6-10.

[9] P.S.B. Zdanski, J.M. Vaz, A.P.C. Dias, Forced convection heat transfer of polymer melt flow inside channels with contraction/expansion sections, Int. Commun. Heat Mass Transfer 38(10) (2011) 1335-1339.

[10] L.J. Yin, D.Z. Chen, H. Wang, X.B. Ma, G.M. Zhou, Simulation of an innovative reactor for waste plastics pyrolysis, Chem. Eng. J. 237(15) (2014) 229-235.

[11] P. Fu, S. Hu, J. Xiang, L.S. Sun, T. Yang, A.C. Zhang, J.Y. Zhang, Mechanism study of rice straw pyrolysis by Fourier transform, Chin. J. Chem. Eng. 17(3) (2009) 522-529.

[12] R. Yan, H. Yang, T. Chin, D.T. Liang, H. Chen, C. Zheng, Influence of temperature on the distribution of gaseous products from pyrolyzing palm oil wastes, Combust. Flame 142(2005) 24-32.

[13] P. Dong, S.E. Yin, L.H. Lou, R.S. Bie, Experimental study on the pyrolysis of waste plastics in fluidized bed, J. Harbin Inst. Technol. 10(2006) 1728-1731(in Chinese).

[14] A. Demirbas, Pyrolysis of municipal plastic wastes for recovery of gasoline-range hydrocarbons, J. Anal. Appl. Pyrolysis 72(1) (2004) 97-102.

[15] E. Gorka, O. Martin, L. Gartzen, A. Maite, B. Javier, Product yields and compositions in the continuous pyrolysis high-density polyethylene in a conical spouted bed reactor, I&EC Res. 50(11) (2011) 6650-6659.

[16] R. Miranda, H. Pakdel, C. Roy, C. Vasile, Vacuum pyrolysis of commingled plastics containing PVC Ⅱ. Product analysis, Polym. Degrad. Stab. 73(1) (2001) 47-67.

[17] S.H. Jung, M.H. Cho, B.S. Kang, J.S. Kim, Pyrolysis of a fraction of waste polypropylene and polyethylene for the recovery of BTX aromatics using a fluidized bed reactor, Fuel Process. Technol. 91(3) (2010) 277-284.

[18] L.P. Carlos, A.C. Howard, Microwave-induced pyrolysis of plastic wastes, Ind. Eng. Chem. Res. 40(40) (2001) 4749-4756.

[19] K.C. Hunter, A.L. East, Properties of C-C bonds in n-alkanes:relevance to cracking mechanisms, J. Phys. Chem. A 106(7) (2002) 1346-1356.

[20] R.W.J. Westerhout, J.A.M. Kuipers, W.P.M. Swaaij, Experimental determination of the yield of pyrolysis products of PE and PP-influence of reaction conditions, Ind. Eng. Chem. Res. 37(37) (1998) 841-847.

[21] S.E. Levine, L.J. Broadbel, Detailed mechanistic modeling of high-density polyethylene pyrolysis:Low molecular weight product evolution, Polym. Degrad. Stab. 94(5) (2009) 810-822.

[22] H. Bockhorn, A. Hornung, U. Hornung, Mechanisms and kinetics of thermal decomposition of plastics from isothermal and dynamic measurements, J. Anal. Appl. Pyrolysis 50(2) (1999) 77-101.

[23] W. Kaminsky, J.S. Kim, Pyrolysis of mixed plastics into aromatics, J. Anal. Appl. Pyrolysis 51(51) (1999) 127-134.

[24] G.X. Yan, X.D. Jing, H. Wen, S.G. Xiang, Thermal cracking of virgin and waste plastics of PP and LDPE in a semi-batch reactor under atmospheric pressure, Energy Fuels 29(4) (2015) 2289-2298.

[25] S.L. Ye, X.B. Ma, D.Z. Chen, P. Tao, Influence of rotating speed on pyrolysis products of waste plastics in rotary kiln, Proc. CSEE 34(23) (2014) 3952-3958(in Chinese).

[26] D.Z. Chen, L.J. Yin, H. Wang, P.J. He, Pyrolysis technologies for municipal solid waste:A review, Waste Manag. 34(12) (2014) 2466-2486.

[27] L.H. Wang, Y. Zhang, L.N. Song, Experimental research on pyrolysis process of waste rubber, Liaoning Technol. Univ. (Nat. Sci. Ed.) 25(336-338) (2006) (in Chinese).

[28] U. Arena, M.L. Mastellone, Defluidization phenomena during the pyrolysis of two plastic wastes, Chem. Eng. Sci. 55(15) (2000) 2849-2860.

[29] I.Cit, A. Sinag, T. Yumak, S. Ucar, Z. Misirlioglu, M. Canel, Comparative pyrolysis of polyolefins (PP and LDPE) and PET, Polym. Bull. 64(8) (2010) 817-834.

[30] I. Ahmad, M.I. Khan, H. Khan, M. Ishap, R. Tariq, K. Gul, W. Ahmad, Pyrolysis study of polypropylene and polyethylene into premium oil products, Int. J. Green Energy 12(7) (2015) 663-671.

[31] S.L. Wong, N. Ngadi, T.A.T. Abdullah, I.M. Inuwa, Current state and future prospects of plastic wasteas source of fuel:a review, Renew. Sust. Energ. Rev. 50(C) (2015) 1167-1180.

[32] L. Zhao, Z.H. Wang, D.Z. Chen, X.B. Ma, J. Luan, Influence of impurities on waste plastics pyrolysis:Products and emissions, Environ. Sci. 33(1) (2012) 329-336(in Chinese).

[33] N. Miskolczi, A. Angyal, L. Bartha, I. Valkai, Fuels by pyrolysis of waste plastics from agricultural and packaging sectors in a pilot scale reactor, J. Fuel Process. Technol. 90(7) (2009) 1032-1040.

[34] M. Sarker, M.M. Rashid, M. Molla, Waste polypropylene plastic conversion into liquid hydrocarbon fuel for producing electricity and energies, Environ. Technol. 33(24) (2012) 2709-2721.

[35] F. Pinto, P. Costa, I. Gulyurtlu, I. Cabrita, Pyrolysis of plastic wastes. I. Effect of plastic waste composition on product yield, J. Anal. Appl. Pyrolysis 51(1) (1999) 39-55.

[36] G.P. Lovasic, N. Jambrec, D.D. Siftar, M.V. Prostenik, Determination of catalytic reformed gasoline octane number by high resolution gas chromatography, Fuel 69(4) (1990) 525-528.

[37] J.M. Escola, J. Aguado, D.P. Serrano, A. Garcia, A. Peral, L. Briones, R. Calvo, E. Fernandez, Calalytic hydroreforming of the polyethylene thermal cracking oil over Ni supported hierarchical zeolites and mesosructurued aluminosilicates, Appl. Catal. B Environ. 106(3-4) (2011) 405-415.

Molten waste plastic pyrolysis in a vertical falling film reactor and the influence of temperature on the pyrolysis products

Molten waste plastic pyrolysis in a vertical falling film reactor and the influence of temperature on the pyrolysis products

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