Fast pyrolysis of rice husk under vacuum conditions to produce levoglucosan

Téllez, Jhoan F.; Silva, Mariana P.; Simister, Rachael; Gomez, Leonardo D.; Fuertes, Valeria Cintia; Paoli, J.M. De; Moyano, Elizabeth L.

doi:10.1016/j.jaap.2021.105105

Cited by 21 publications

(13 citation statements)

References 65 publications

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“…K 3 PO 4 •3H 2 O shows the highest promotion effects. This is because alkaline environment induced by K 3 PO 4 •3H 2 O is harmful for the production of ketone products [44]. 30%, 50% KH 2 PO 4 impregnation increase the yields of LG.…”

Section: Co-catalytic Pyrolysis By Cao and Potassium Phosphatesmentioning

confidence: 99%

Experimental Study on Pyrolysis of Rice Straw Catalyzed by CaO/Al2O3-Phosphate Mixture

Zhang

et al. 2022

Bioenerg. Res.

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This paper studied the synergistic effects of CaO or Al 2 O 3 and three potassium phosphates (e.g., KH 2 PO 4 , K 2 HPO 4 •3H 2 O and K 3 PO 4 •3H 2 O) in the rice stalk pyrolysis through pyrolysis-gas chromatography-mass spectrometer (Py-GC/MS) experiments. The results show that after co-catalyzed by CaO/Al 2 O 3 and potassium phosphates, the total contents of phenols, aldehydes, acids, LG from most samples decrease and those of ketones increase compared with those catalyzed by potassium phosphates alone.CaO/Al 2 O 3 and potassium phosphates show synergistic effects in the regulation of the types or contents of phenols, ketones, aldehydes, etc. and are suitable for the production of ketone-rich bio-oil. Dehydration reactions, etc. are further promoted under the co-catalysis of the two catalysts, and some phenols can be converted to benzene products, etc. The contents of acetic acid can decrease to 0. For 50% K 3 PO 4 .3H 2 O impregnated sample, the yields of furans reduce sharply after CaO addition. For most impregnated samples except 50% K 2 HPO 4 •3H 2 O sample and 30%, 50% K 3 PO 4 .3H 2 O, the contents of total furans and furfural increase after Al 2 O 3 addition.

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Section: Co-catalytic Pyrolysis By Cao and Potassium Phosphatesmentioning

confidence: 99%

Experimental Study on Pyrolysis of Rice Straw Catalyzed by CaO/Al2O3-Phosphate Mixture

Zhang

et al. 2022

Bioenerg. Res.

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“…LG has a huge reserve and can form glucose 6-phosphate to involve the glycolytic pathway by expressing LG kinase (LGK) or obtain glucose by hydrolysis of LG for further fermentation [23][24][25], and LGO comprises a cyclic acetal, chiral carbon, and α,βunsaturated ketone motif and is suitable for the synthesis of C 6 monomer (hexan-1,6-diol), green solvent (cyrene), natural products (such as tetrodotoxin), chiral auxiliaries, and bioactive compounds [26,27]. At present, the preparation of anhydro-sugars using agricultural wastes such as peanut husk [28], bagasse [29], barley straw [30], and rice husk [31] as raw materials has been studied. For the starch-rich IIR, the preparation of high-value anhydro-sugars is also a worth exploring direction.…”

Section: Introductionmentioning

confidence: 99%

Characterization of isolated starch from Isatis indigotica Fort. root and anhydro-sugars preparation using its decoction residues

Gao

Lin

et al. 2023

Biomass Conv. Bioref.

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Isatis indigotica Fort. root (Ban-lan-gen, IIR), a traditional Chinese medicine (TCM), has an ancient and well-documented history for its medicinal properties. Aside from epigoitrin, indole alkaloids, and their corresponding derivatives as medicinal ingredients, it also contains lots of biomass such as starch. Herein, a new starch was isolated from IIR and the physicochemical properties such as amylose content, moisture content, ash content, morphology, thermal properties, and crystallography were characterized systematically. The amylose content of IIR starch was 19.84 ± 0.85%, and the size and shape of starch granules is ellipsoidal shape with sizes from 2 to 10 μm. IIR starch exhibited a C-type pattern and had 25.92% crystallinity (higher than that of corn starch). The gelatinization temperature of IIR starch was 58.68–75.41 °C, and its gelatinization enthalpy was Δ H gel = 4.33 J/g. After decocting, the IIR’s residues can be used to prepare anhydro-sugars in a polar aprotic solvent. The total carbon yield of levoglucosan (LG), levoglucosenone (LGO), 5-hydroxymethylfurfural (HMF), and furfural (FF) could reach 69.81% from IIR’s decoction residues in 1,4-dioxane with 15 mM H 2 SO 4 as the catalyst. Further, the residues after dehydration were prepared into biochar by thermochemical conversion and the BET surface area of biochar was 1749.46 m 2 /g which has good application prospect in soil improvement and alleviates obstacles of IIR continuous cropping.

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“…Among its bene ts, the ease of storage and transportation of the liquid product (bio-oil) stands out the most. The bio-oil can be used as fuel or as a source of raw materials for various chemical industries (Betemps et al 2017;Huang;Lo, 2018;Sanches Filho et al,2018, 2020Téllez et al 2021;Zhang et al 2019). The products resulting from pyrolysis can be classi ed as condensable volatiles (bio-oil), non-condensable volatiles (gas), and solid residue, also known as biochar (Wang et al 2020;Zhang et al 2018).…”

Section: Introductionmentioning

confidence: 99%

Silica extraction from rice hull ash through the sol–gel process under ultrasound

Fusinato

Amaral

Irigon

et al. 2022

Environ Sci Pollut Res

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Rice is among the main foods produced in the world and is part of the daily diet of most families. The main waste from rice processing is rice husk (RH), which has been used as biomass for energy generation through combustion. In this process, rice husk ash (RHA) is generated as a residue, and its silica (SiO 2 ) content varies from 85-98%. The present work describes the study of the extraction of silica from RHA by the ultrasoundassisted sol-gel method. An experimental design based on the Response Surface Methodology (RSM) with the symmetrical, second-order Rotational Central Composite Design (RCCD) was applied to determine the best extraction conditions considering extraction time and molar ratio (n) as variables = n NaOH / n Silica ). These optimal conditions were then applied to three ash samples, two obtained by the combustion process in a boiler furnace, with a mobile grate system (RHAC 1 and RHAC 2 ), and one obtained by the pyrolysis process (RHAP) carried out in a xed bed reactor. Results showed that a molar ratio of 4.4, and an extraction time of 107 minutes were the best extraction conditions, leading to a yield of 73.3% for RHAP, 43.9% for RHAC 1 , and 31.1% for RHAC 2 . It was found that the extraction yield and textural properties of the silica obtained depend on the characteristics of the ash used. The silica extracted from RHAC 1 presented a surface area of 465 m 2 .g − 1 , mesopores of 4.69 nm, purity greater than 95%, and an ultra-ne granulometric distribution, reaching nanoparticle dimensions, characteristics comparable to commercially available silicas.

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Fast pyrolysis of rice husk under vacuum conditions to produce levoglucosan

Cited by 21 publications

References 65 publications

Experimental Study on Pyrolysis of Rice Straw Catalyzed by CaO/Al2O3-Phosphate Mixture

Experimental Study on Pyrolysis of Rice Straw Catalyzed by CaO/Al2O3-Phosphate Mixture

Characterization of isolated starch from Isatis indigotica Fort. root and anhydro-sugars preparation using its decoction residues

Silica extraction from rice hull ash through the sol–gel process under ultrasound

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