Supercritical extraction of lignin oxidation products in a microfluidic device

Assmann, Nora; Werhan, Holger; Ladosz, Agnieszka; Rohr, Philipp Rudolf von

doi:10.1016/j.ces.2013.05.032

Cited by 43 publications

(28 citation statements)

References 11 publications

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“…[157] Microwave-assisted chemical synthesis or separation processes benefit from enhanced temperature regulation and better heat distribution. This has already been shown in the supercritical extraction of lignin oxidation products, [174,175] and reactive extraction of lactic acid (e. g., obtained from fermentation broths) using microreactors. [162] These reactions could be performed more rapidly and selectively under microwave processing.…”

Section: Process Intensification For Biomass Conversionmentioning

confidence: 63%

Catalytic Transformation of Biomass Derivatives to Value‐Added Chemicals and Fuels in Continuous Flow Microreactors

2019

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Biomass as a renewable and abundantly available carbon source is a promising alternative to fossil resources for the production of chemicals and fuels. The development of biobased chemistry, along with catalyst design, has received much research attention over recent years. However, dedicated reactor concepts for the conversion of biomass and its derivatives are a relatively new research field. Continuous flow microreactors are a promising tool for process intensification, especially for reactions in multiphase systems. In this work, the potential of microreactors for the catalytic conversion of biomass derivatives to value-added chemicals and fuels is critically reviewed. Emphases are laid on the biphasic synthesis of furans from sugars, oxidation and hydrogenation of biomass derivatives. Microreactor processing has been shown capable of improving the efficiency of many biobased reactions, due to the transport intensification and a fine control over the process. Microreactors are expected to contribute in accelerating the technological development of biomass conversion and have a promising potential for industrial application in this area.

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Section: Process Intensification For Biomass Conversionmentioning

confidence: 63%

Catalytic Transformation of Biomass Derivatives to Value‐Added Chemicals and Fuels in Continuous Flow Microreactors

2019

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“…For both analysis and separation, fully separated phases ease the handling. However, separating the different phases from a segmented flow at high pressures is a challenge that requires additional components and existing systems have not been able to split up scCO 2 and H 2 O efficiently [6,7,11].…”

Section: Page 3 Of 30mentioning

confidence: 99%

“…Also, scCO 2 has been used as a solvent to extract vanillin from an aqueous solution in a segmented flow [6], and aromatic monomers from lignin oxidation products [7], using a glass/silicon microfluidic device. Recently, Marre et al have demonstrated how a simple glass/silicon chip can be used for many applications, e.g.…”

Section: Page 3 Of 30mentioning

confidence: 99%

Influence of surface modifications and channel structure for microflows of supercritical carbon dioxide and water

Knaust

Andersson

Hjort

et al. 2016

The Journal of Supercritical Fluids

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“…Nowadays, more than 16 000 tons of vanillin are annually produced by chemical synthesis in addition to the extraction from vanilla plants. However, the traditional synthesis pathways such as the nitrose, lignin, glyoxylic acid, and biotechnological methods face serious economic and environmental challenges . Therefore, suitable green processes are urgently needed .…”

Section: Introductionmentioning

confidence: 99%

Kinetic studies on the liquid‐phase catalytic oxidation of 4‐methyl guaiacol to vanillin

Liu

Mao

et al. 2017

Can J Chem Eng

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Kinetic studies on the catalytic oxidation of 4‐methyl guaiacol using an ether intermediate towards vanillin in an agitator bubbling reactor were presented. The reaction was catalyzed by N,N′‐ethylenebis(acetylacetoniminato)‐cobalt(II) hexafluorophosphoric pyridinium (Co‐[Salen‐Py][PF6]2) under strong alkaline conditions with molecular oxygen as the terminal oxidant. The reaction scheme was demonstrated by a detailed analysis of the products distribution and control experiments. The intrinsic kinetics were explored based on our proposed p‐benzoquinone methide mechanism, which revealed that the oxidation rate was determined by the oxidation of phenoxyl anion to phenoxyl radical catalyzed by LCo3+(O2·) (L = [Salen‐Py][PF6]2). The kinetic experiments were performed under a mass transfer‐reaction condition due to the inevitable mass transfer resistance involved. Pseudo‐first order fast reactions were observed for both steps of the consecutive reactions based on the calculated physical and mass transfer parameters. The intrinsic kinetic equations for the first and second steps can be written as RA=5.98×105exp(−31950RT)CCcat.CO2A and RF=1.02×106exp(−29770RT)CCcat.CO2E, respectively, which are well in accordance with the mechanism. These conclusions are expected to give a clue for the mechanistic study, kinetic investigation, reaction optimization, and catalyst design for the oxidation of various p‐cresols.

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Supercritical extraction of lignin oxidation products in a microfluidic device

Cited by 43 publications

References 11 publications

Catalytic Transformation of Biomass Derivatives to Value‐Added Chemicals and Fuels in Continuous Flow Microreactors

Catalytic Transformation of Biomass Derivatives to Value‐Added Chemicals and Fuels in Continuous Flow Microreactors

Influence of surface modifications and channel structure for microflows of supercritical carbon dioxide and water

Kinetic studies on the liquid‐phase catalytic oxidation of 4‐methyl guaiacol to vanillin

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