Fast Pyrolysis of Lignin Pretreated with Magnesium Formate and Magnesium Hydroxide

Mayank Patel, Nick Hill, Charles A. Mullen, Sampath Gunukula and William J. DeSisto
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Mayank Patel: Department of Chemical and Biomedical Engineering, University of Maine, Orono, ME 04469, USA
Nick Hill: Department of Chemical and Biomedical Engineering, University of Maine, Orono, ME 04469, USA
Charles A. Mullen: USDA-ARS, Eastern Regional Research Center, 600 E. Mermaid Lane, Wyndmoor, PA 19038, USA
Sampath Gunukula: Department of Chemical and Biomedical Engineering, University of Maine, Orono, ME 04469, USA
William J. DeSisto: Department of Chemical and Biomedical Engineering, University of Maine, Orono, ME 04469, USA

Energies, 2020, vol. 13, issue 19, 1-10

Abstract: Kraft lignin (Indulin AT) pretreated with magnesium formate and magnesium hydroxide was fast-pyrolyzed in a continuously fed, bench-scale system. To avoid fouling issues typically associated with lignin pyrolysis, a simple laboratory test was used to determine suitable ranges of magnesium hydroxide and formic acid to lignin for feeding without plugging problems. Various feedstock formulations of lignin pretreated with magnesium hydroxide and formic acid were pyrolyzed. For comparison, calcium formate pretreated lignin was also tested. The organic oil yield ranged from 9% to 17% wt % on a lignin basis. Carbon yields in the oil ranged from 10% to 18% wt % on a lignin basis. Magnesium formate pretreatment increased oil yield and carbon yield in the oil up to 35% relative to the higher 1:1 g magnesium hydroxide/g lignin pretreatment. However, a lower magnesium hydroxide pretreatment (0.5:1 g magnesium hydroxide/g lignin) resulted in oil yields and carbon yields in the oils similar to the magnesium formate pretreatments. Magnesium formate pretreatment produced more oil but with a higher oxygen content than calcium formate under the same conditions. The GC-MS analysis of product oils indicated that phenols and aromatics were more prevalent in pyrolyzed magnesium-formate-pretreated lignin.

Keywords: lignin; magnesium salts; pyrolysis (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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