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Biomass Chemical Engineering ›› 2021, Vol. 55 ›› Issue (4): 1-6.doi: 10.3969/j.issn.1673-5854.2021.04.001

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Pyrolysis Characteristics and Pyrolysis Products of Sunflower Stem

Donghua JI, Hongyan LI, Zhendong LEI, Gaojian MIAO, Ming ZHAO, Zhihe WANG()   

  1. College of Material Science and Engineering, Nanjing Forestry University, Nanjing 210037, China
  • Received:2020-07-22 Online:2021-07-30 Published:2021-07-10
  • Contact: Zhihe WANG E-mail:1159630670@qq.com


In order to make full use of biomass sunflower stalks, the simultaneous thermal analyzer was used to study the pyrolysis characteristics of sunflower stalks with heating rate as an influencing factor. The Coats-Redfern integral method was used to calculate the main phase pyrolysis kinetic parameters. And the quantitative analysis of pyrolysis products were studied by pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS). The results showed that the pyrolysis process of sunflower stalk could be divided into three stages: preheating and drying, main pyrolysis and charring; as the heating rate increased, the TG curve of sunflower stalk pyrolysis moved to the high temperature zone. In the main pyrolysis stage (125-400℃), the weight loss rate of sunflower stalk was about 85% of the total weight loss, the activation energies (E) were 37.02-40.48 kJ/mol, and the pre-exponential factors (A) were 6.10×102-27.67×102 min-1, the linear fitting correlation coefficients were all greater than 0.97. During the rapid thermal cracking process, 106 characteristic peaks and 86 characteristic substances were detected, which could be divided into 11 categories according to different chemical types. The main characteristic products of thermal cracking were stearic acid(29.991%), palmitic acid(27.642%), n-octadecane(7.185%), methyl stearate(2.239%), isoprene(1.678%).

Key words: sunflower stem, thremogravimetric, pyrolysis kinetics, product analysis

CLC Number: