The mechanism of wet/dry torrefaction pretreatment on the pyrolysis performance of tobacco stalk

He, Zhen; Ren, Ting X; Wu, Yujian; Jiang, Enchen; Xu, Xinhua

doi:10.1016/j.biortech.2019.121390

Cited by 37 publications

(19 citation statements)

References 46 publications

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“…The main degradation reactions in both processes were dehydration and decarboxylation [45]. The degradation of hemicellulose is significant in wet torrefaction due to more efficient heat transfer between sugarcane leaves samples and solvent and their large surface areas in contact with each other [46]. The high ion product of subcritical water enhances the degradation of biomass.…”

Section: Chemical Composition Of Raw and Torrefied Sugarcane Leavesmentioning

confidence: 99%

Comparative study of solid biofuels derived from sugarcane leaves with two different thermochemical conversion methods: wet and dry torrefaction

2021

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This work describes the conversion of sugarcane leaves into biocoal with two thermal processes: wet torrefaction (subcritical water, 175-250 °C) and dry torrefaction (nitrogen atmosphere, 225-300 °C). The residence time was 30 min for both processes. The effects on physical and energy characteristics, including mass and energy yield, proximate and ultimate analyses, fiber analysis, higher heating value (HHV), structural parameters determined by Fourier-transform infrared spectroscopy, and O/C and H/C atomic ratios were used for comparisons. The results showed that increasing the reaction temperature lowers the mass yield; however, it also significantly improves the fuel ratio of torrefied samples. The highest HHV of wet and drytorrefied samples were 23.31 and 22.07 MJ/kg, respectively. The best removal of ash and sulfur content was obtained under wet torrefaction. Moreover, wet torrefaction was recommended as a suitable process for hemicellulose depolymerization. At 250 °C, the wet-torrefied sample had the highest fuel ratio (0.48) and was suited for biomass co-firing. The finding that wet-torrefied samples reached the same range of lignite at lower reaction temperatures than dry-torrefied samples was particularly intriguing. Torrefaction at the temperatures below 250 °C did not prove to have a statistically significant effect on the energy properties of the dry-torrefied samples. Therefore, wet torrefaction is a promising process in the thermochemical conversion of sugarcane leaves into solid biofuel.

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Section: Chemical Composition Of Raw and Torrefied Sugarcane Leavesmentioning

confidence: 99%

Comparative study of solid biofuels derived from sugarcane leaves with two different thermochemical conversion methods: wet and dry torrefaction

2021

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“…Because of the rich hydrophilic functional groups of the former two components (Jiang et al 2017;Hofstetter et al 2006), the plant fibers present strong hydrophilic properties. Water adsorption capability of the plant fibers is closely related to their properties, such as mechanical strength (Perrier et al 2017;Ridzuan et al 2016), physicochemical resistance (Varara et al, 2018), bacterial inhibition capability (Popescu et al 2014), hydrolysis (Jiang et al 2021) and pyrolysis performance (Sun et al 2019). Therefore, the water adsorption behaviour on plant fibers is importantly correlated to their wide applications, such as fields of paper-making (Modaressi and Garnier 2002), bio-energy (Emerson et al 2018;Sotannde et al 2020), bio-degradation (Gheorghita et al 2020), functional materials (Hachem et al 2020;Melo et al 2021), pharmaceutics, cosmetics, textile and tobacco industries (Sun et al 2019).…”

Section: Introductionmentioning

confidence: 99%

Mechanism of moisture adsorption in plant fibers surface-modified with glycerol evaluated by LF-NMR relaxation technique

Zhang

et al. 2022

Cellulose

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Surface modification by humectants is an important technology to improve product quality in textile field, healthcare, tobacco processing and paper-making industry. As a common humectant glycerol is applied to keep the moisture adsorbability of the plant fibers during manufacturing. The effects of glycerol on the moisture adsorption of the plant fibers were studied by analyzing the induced differences of bulk and surface physicochemical property with XRD, FTIR, SEM characterizations. The improvement of moisture adsorption capacity of the modified plant fibers was caused by the increased active adsorption sites, while the moisture diffusion resistance increased simultaneously with glycerol indicated by a declining Deff. LF-NMR relaxation spectra demonstrated the water state and distribution in the plant fibers were changed by loading glycerol. The moisture transfer mechanisms induced by glycerol were also investigated. Free water failed to materialize in the plant fibers treated with glycerol, immobile water existed preferentially during the adsorption, and bound water presented increasing after the immobile water was saturated. These findings are referenced values to improve the manufacturing processes of moisture-retaining properties of different functional plant fibers. Graphical abstract

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“…Commonly, the utilization of biomass pyrolysis oil was restricted due to its inferior performances, such as complex components, high O content, acidic properties, thermal instability, and so on. 22,23 In this research, a biomass-derived imitative DES composed of BL-oil and ChCl was designed. The effect of imitative DES pretreatment on compositions of CS as well as the pyrolytic saccharification was systematically studied.…”

Section: ■ Introductionmentioning

confidence: 99%

Pretreatment Influence of an Imitative Deep Eutectic Solvent Composed of Biomass Light Oil and Choline Chloride on Boosting Selective Saccharification during Corn Stalk Pyrolysis

Zhang

et al. 2021

ACS Sustainable Chem. Eng.

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As a novel pretreatment method, a deepeutectic solvent (DES) can effectively deconstruct lignocellulose to promote its selective saccharification. In this research, biomass light oil (BL-oil) and choline chloride (ChCl) were employed to prepare a novel, low-cost imitative DES to boost pyrolytic saccharification of corn stalk (CS). The physical−chemical properties of original CS and pretreated samples were investigated. Furthermore, the influence of mass ratio of BL-oil and ChCl as well as pretreated temperature on pyrolytic product distribution was studied. The results showed that the imitative DES had a similar pretreated effect to commercial DESs, which can destroy the structure of CS to facilitate the degradation of hemicellulose and lignin. In addition, the imitative DES was more conducive to removal of alkali metals and alkaline earth metals. The yield of levoglucosan increased from 2.59 to 59.87 mg/g under the optimum imitative DES pretreated condition. The preparation and utilization of a biomass-derived imitative DES broadened the application of biomass pyrolysis oil and realized the "closed-loop" concept of biorefinery.

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The mechanism of wet/dry torrefaction pretreatment on the pyrolysis performance of tobacco stalk

Cited by 37 publications

References 46 publications

Comparative study of solid biofuels derived from sugarcane leaves with two different thermochemical conversion methods: wet and dry torrefaction

Comparative study of solid biofuels derived from sugarcane leaves with two different thermochemical conversion methods: wet and dry torrefaction

Mechanism of moisture adsorption in plant fibers surface-modified with glycerol evaluated by LF-NMR relaxation technique

Pretreatment Influence of an Imitative Deep Eutectic Solvent Composed of Biomass Light Oil and Choline Chloride on Boosting Selective Saccharification during Corn Stalk Pyrolysis

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