Fast Pyrolysis of Four Lignins from Different Isolation Processes Using Py-GC/MS

Article, Other literature type English OPEN
Lin, Xiaona ; Sui, Shujuan ; Tan, Shun ; Pittman, Charles ; Sun, Jianping ; Zhang, Zhijun (2015)
  • Publisher: Multidisciplinary Digital Publishing Institute
  • Journal: Energies, volume 8, issue 6 6, pages 1-15 (issn: 1996-1073)
  • Related identifiers: doi: 10.3390/en8065107
  • Subject: lignin; fast pyrolysis; phenolic compounds; Py-GC/MS | phenolic compounds | lignin | Technology | Py-GC/MS | T | fast pyrolysis
    • jel: jel:Q0 | jel:Q | jel:Q4 | jel:Q47 | jel:Q49 | jel:Q48 | jel:Q43 | jel:Q42 | jel:Q41 | jel:Q40

Pyrolysis is a promising approach that is being investigated to convert lignin into higher value products including biofuels and phenolic chemicals. In this study, fast pyrolysis of four types of lignin, including milled Amur linden wood lignin (MWL), enzymatic hydrolysis corn stover lignin (EHL), wheat straw alkali lignin (AL) and wheat straw sulfonate lignin (SL), were performed using pyrolysis gas-chromatography/mass spectrometry (Py-GC/MS). Thermogravimetric analysis (TGA) showed that the four lignins exhibited widely different thermolysis behaviors. The four lignins had similar functional groups according to the FTIR analysis. Syringyl, guaiacyl and p-hydroxyphenylpropane structural units were broken down during pyrolysis. Fast pyrolysis product distributions from the four lignins depended strongly on the lignin origin and isolation process. Phenols were the most abundant pyrolysis products from MWL, EHL and AL. However, SL produced a large number of furan compounds and sulfur compounds originating from kraft pulping. The effects of pyrolysis temperature and time on the product distributions from corn stover EHL were also studied. At 350 °C, EHL pyrolysis mainly produced acids and alcohols, while phenols became the main products at higher temperature. No obvious influence of pyrolysis time was observed on EHL pyrolysis product distributions.
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