Pyrolysis Characteristics of Blends from Coal and Polyethylene

Abstract:

Shenfu coal (SFC) was pulverized and modified with planetary ball mill. Maceral separation of the coal was performed by means of density gradient centrifuge in zinc chloride solution. Blends from low density polyethylene (LDPE) and parent coal powder, iron ions loaded coal powder, or floated maceral fractions were prepared in co-rotation twin-screw extruder. Pyrolysis characteristics were investigated based on differential scanning calorimetry (DSC) measurements, apparent activation energies were calculated according to Kissiger and Ozawa methods. It is found that chemical interaction between SFC and LDPE is attributed to their overlapped pyrolysis temperature regions, leading to instant and rapid propagation and termination of macromolecular chains produced in the co-pyrolysis. Iron ions loaded in the coal can facilitate formation of radicals with acceleration in chemical reaction rates. Thermal degradation of LDPE is rate-determining step in co-pyrolysis of the coal and the polyethylene. Maceral fraction floated in 1.25g·cm^-3 zinc chloride solution is more reactive with polyethylene due to its higher content in aliphatic hydrocarbon and hydrogen, playing a role of excellent hydrogen donor to LDPE in the co-pyrolysis.

• Periodical: Advanced Materials Research (Volumes 887-888)
• Pages: 993-996
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.887-888.993
• Online since: February 2014
• Authors: Fu Sheng Yang*, Ming Zhang, Ben Long Wei, Min Qun Lin
• Keywords: Blend, Differential Scanning Calorimetry (DSC), Polyethylene, Pyrolysis, Shenfu Coal

References

[1] M.M. Massaro, S.F. Son and L.J. Groven: Fuel Vol. 115 (2014), P. 62.

[2] L.M. Zhou, T.A. Luo and Q.W. Huang: Energy Conversion and Management Vol. 50 (2009), p.705.

[3] R. Sakurovs: Fuel Vol. 82 (2003), p. (1911).

[4] P. Straka and J. Náhunková: Journal of Thermal Analysis and Calorimetry Vol. 76 (2004), p.49.

[5] J.J. Lu, Y.S. Zhao and W.R. Bao: Journal of China Coal Society Vol. 30 (2005), p.229 (in Chinese).

[6] E. Jorjani, S. Esmaeili and M. Tayebi Khorami: Fuel Vol. 114 (2013), p.10.

[7] F.S. Yang and A.N. Zhou: Journal of Coal Science and Engineering (China) Vol. 10 (2004), p.53.

[8] T.K. Das: Fuel Vol. 80 (2001), p.97.

[9] J. Feng, J. Li and W.Y. Li: Fuel Processing Technology Vol. 109 (2013), p.19.

[10] W. Li, Y. Zhu, S. Chen and Y. Zhou: Fuel Vol. 107 (2013), p.648.