Hydrothermal decomposition of alkali lignin in sub- and supercritical water

Pińkowska, Hanna; Wolak, Paweł; Złocińska, Adrianna

doi:10.1016/j.cej.2012.01.092

Cited by 158 publications

(81 citation statements)

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“…For example, Yong and Matsumura (2012) studied decomposition of lignin in a flow reactor over the temperature range of 390 to 480°C and at residence times from 0.5 to 40 s, claiming complete decomposition within 5 s. Pińkowska et al (2012) studied hydrothermal treatment of alkali lignin over the temperature range of 280 to 390°C. The authors found the greatest yields of stable phenol and cresol products at 280°C Barbier et al (2012) performed a detailed analysis of the products of lignin decomposition in sub-and supercritical water (370-390°C) and concluded that the mechanism consisted of a complex network of parallel and sequential fragmentation and re-condensation reactions.…”

Section: Subcritical and Supercritical Water Hydrolysis Technologymentioning

confidence: 99%

Applications of subcritical and supercritical water conditions for extraction, hydrolysis, gasification, and carbonization of biomass: a critical review

et al. 2017

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Please cite this article as: Lachos-Perez D., Brown A.B., Mudhoo A., Martinez J., Timko M.T., Rostagno M.A., Forster-Carneiro T. Subcritical and supercritical water extraction, hydrolysis, gasification and carbonization of biomass: a critical review. Biofuel Research Journal 14 (2017) HIGHLIGHTSØAdvances of research trends in development of subcritical and supercritical water processes technologies are reviewed.Essential aspects of sub-and supercritical water applied to extraction, hydrolysis, carbonization and gasification processes are discussed. ØEquipment design, process parameters, and types of biomass used for sub-and supercritical water process are presented. ØBioactive compounds, reducing sugars, hydrogen, biodiesel, and hydrothermal char are the final products of sub-and supercritical water processes. This review summarizes the recent essential aspects of subcritical and supercritical water technology applied to the extraction, hydrolysis, carbonization, and gasification processes. These are clean and fast technologies which do not need pretreatment, require less reaction time, generate less corrosion and residues, do not use toxic solvents, and reduce the synthesis of degradation byproducts. The equipment design, process parameters, and types of biomass used for subcritical and supercritical water process are presented. The benefits of catalysis to improve process efficiency are addressed. Bioactive compounds, reducing sugars, hydrogen, biodiesel, and hydrothermal char are the final products of subcritical and supercritical water processes. The present review also revisits advances of the research trends in the development of subcritical and supercritical water process technologies. GRAPHICAL ABSTRACT ARTICLE INFO ABSTRACT

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Section: Subcritical and Supercritical Water Hydrolysis Technologymentioning

confidence: 99%

Applications of subcritical and supercritical water conditions for extraction, hydrolysis, gasification, and carbonization of biomass: a critical review

et al. 2017

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“…The authors found that changes in water density affected the yields and composition of the phenolic compounds with increasing reaction times in a batch reactor. Pinkowska et al [6] reported a maximum combined yield of 11.23 wt% for guaiacol, catechol, phenol and cresol isomers at 280 °C (zero holding time) in the absence of any catalysts. Zakzeski et al [16] obtained 17 wt% yield of monomeric aromatic oxygenates such as guaiacols during liquid-phase reforming of Organosolv lignin in a water/ethanol mixture at 225 °C, 58bar with Pt/Al 2 O 3 catalyst.…”

Section: A Introductionmentioning

confidence: 99%

“…Besides, based on the structure of lignin, it is potentially a likely renewable source of aromatic chemicals. This is probably driving the increasing research on the valorization of lignin for chemical and liquid fuel production around the world in recent years [1][2][3][4][5][6][7][8]. In this regard, different thermochemical methods of depolymerizing lignin into high-value aromatic chemicals are being investigated, including fast pyrolysis, wet oxidation and hydrothermal processing.…”

Section: A Introductionmentioning

confidence: 99%

Catalytic depolymerization of alkali lignin in subcritical water: influence of formic acid and Pd/C catalyst on the yields of liquid monomeric aromatic products

2014

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“…This indicated that a lengthy reaction time was not conducive to the depolymerization of alkali lignin in sub-and super-critical ethanol. A longer reaction time could lead to the mass of char was due to carbonization and recondensation between lignin-degraded products (Yuan et al 2010;Pińkowska et al 2012).…”

Section: Effect Of Reaction Conditions On the Yields Of Depolymerizatmentioning

confidence: 99%

Catalytic Depolymerization of Alkali Lignin in Sub- and Super-critical Ethanol

Guo¹,

Liu²,

Tang³

et al. 2017

BioResources

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The effects of reaction parameters on catalytic depolymerization of alkali lignin in sub-and super-critical ethanol were investigated using a high pressure autoclave, and the liquid oil and solid char products were characterized. The experimental data indicated that Rh catalysis, controlling reaction conditions at ethanol critical temperature (240 ºC) and pressure (7.0 MPa), high ethanol/water ratios (100/0), and the medium reaction time (4 h) enhanced the depolymerization of alkali lignin to liquid oil and decreased the char formation. A gas chromatography/mass spectroscopy (GC/MS) analysis showed that the main compositions of liquid oils were phenols, esters, ketones, and acid compounds, and the supercritical state favored the formation of bio-phenols, but the subcritical state improved the generation of bio-esters. Scanning electron microscopy (SEM) and Fourier transform infrared spectrometer (FTIR) spectra analysis showed that the addition of the Raney/Ni and Rh/C catalysis could inhibit the re-fusion of alkali lignin micron-sized spheres in the supercritical ethanol, which led to an increase in the occurrence of the depolymerization reactions.

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Hydrothermal decomposition of alkali lignin in sub- and supercritical water

Cited by 158 publications

References 10 publications

Applications of subcritical and supercritical water conditions for extraction, hydrolysis, gasification, and carbonization of biomass: a critical review

Applications of subcritical and supercritical water conditions for extraction, hydrolysis, gasification, and carbonization of biomass: a critical review

Catalytic depolymerization of alkali lignin in subcritical water: influence of formic acid and Pd/C catalyst on the yields of liquid monomeric aromatic products

Catalytic Depolymerization of Alkali Lignin in Sub- and Super-critical Ethanol

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