Electron-beam decomposition of phytogenous substances: Solid-to-liquid conversion

Пономарев, А. В.

doi:10.1016/j.radphyschem.2009.01.007

Cited by 12 publications

(5 citation statements)

References 9 publications

(6 reference statements)

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“…As shown earlier [6,7], the dry distilling combined with an electron beaming gives the chance to change considerably composition and properties of the organic tar being produced from a vegetative feedstock. In the present work, the tar produced via the combined method from lignin has been tested as inhibitor of styrene thermopolymerization.…”

Section: Introductionmentioning

confidence: 91%

Thermopolymerization inhibitors generated via radiolysis of lignin

et al. 2018

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The pyrogenic conversion of lignin to a phenolic tar can be significantly enhanced by combining dry distillation with simultaneous electron-beam treatment of lignin. The tar produced by the combined method contains three times more benzenediols in comparison with conventional pyrogenic distillation method. As shown, the tar of radiation-thermal origin can inhibit the thermopolymerization of certain monomers, such as styrene. The inhibiting ability of tar exceeds that of synthetic phenolic inhibitors. In the presence of 0.025 wt% of the tar, the induction period of styrene thermopolymerization at 120 °С is at least 120 min. Radiation-thermal formation of phenolic tar obeys the chain mechanism and thereby, is a highly efficient process.

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Section: Introductionmentioning

confidence: 91%

Thermopolymerization inhibitors generated via radiolysis of lignin

et al. 2018

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“…Dynamics of electron-beam heating of cellulose at the dose rate of 2.5 kGy/s (the specific surface area Z of the material is 105 cm 2 /g; the volume density is 150 g/dm 3 ) [13]. The temperature region of distillation of decomposition products is shaded.…”

Section: Radiation-thermal Transformations Of Cellulose At High Domentioning

confidence: 99%

“…As follows from the presented material, the use of high-energy accelerated electrons makes it possible to implement a direct single-stage conversion of cellulose biomass into liquid condensate. In comparison with pyrolysis, electron-beam distillation has several advantages: it hampers water formation, halves the accumulation of charcoal and increases ~6-fold the yield of liquid organic products [13,87,88,89]. Such high performance of the process is related to the specific mechanism operating upon simultaneous action of ionizing radiation and heating.…”

Section: Advanced Applicationsmentioning

confidence: 99%

“…Obviously, these compounds are formed upon radiolytic transformations of the alkane used as the carrier gas. Note that the procedure of electron-beam distillation of cellulose in a light alkane medium provides a fixation yield of gaseous alkane an order of magnitude higher than radiolysis of the gas without addition of cellulose feedstock [13,92]. This may be based on transfer of radical, charge and energy between intermediates originating from cellulose and the alkane.…”

Section: Advanced Applicationsmentioning

confidence: 99%

“…Initially, studies of cellulose decomposition with cleavage of the polymer chain were mainly carried out at room and moderate temperatures when pyrolytic processes related to feedstock distillation do not occur. The situation has changed considerably in the past few years when it was shown [12,13] that the electron-beam radiolysis of cellulose at higher temperatures (>190 °C) results in deeper transformations with formation of liquid organic products and gases.…”

Section: Introductionmentioning

confidence: 99%

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Radiation-Induced High-Temperature Conversion of Cellulose

Пономарев¹,

Ершов²

2014

Molecules

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Thermal decomposition of cellulose can be upgraded by means of an electron-beam irradiation to produce valuable organic products via chain mechanisms. The samples being irradiated decompose effectively at temperatures below the threshold of pyrolysis inception. Cellulose decomposition resembles local "explosion" of the glucopyranose unit when fast elimination of carbon dioxide and water precede formation of residual carbonyl or carboxyl compounds. The dry distillation being performed during an irradiation gives a liquid condensate where furfural and its derivatives are dominant components. Excessively fast heating is adverse, as it results in a decrease of the yield of key organic products because pyrolysis predominates over the radiolytic-controlled decomposition of feedstock. Most likely, conversion of cellulose starts via radiolytic formation of macroradicals do not conform with each other, resulting in instability of the macroradical. As a consequence, glucosidic bond cleavage, elimination of light fragments (water, carbon oxides, formaldehyde, etc.) and formation of furfural take place.

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