Aromatic products of radiation-thermal degradation of lignin and chitin

Metreveli, A. K.; Metreveli, P. K.; Makarov, Igor; Пономарев, А. В.

doi:10.1134/s0018143913020070

Cited by 10 publications

(5 citation statements)

References 7 publications

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“…For example, acetamide has been reported as a degradation product from both chitin , and N -acetylglucosamine and acetamide, N-(2,4-dihydroxyphenyl) from pyrolysis of chitin at 500 °C . Acetamide and acetic acid are possible products of pericyclic elimination. , Pyridinone derivatives can be a result of dehydration involving the acetamido group . The N -acetylglucosamine monomer released from chitin hydrolysis undergoes dehydration to form a furanic compound to which subsequently, oxygen–nitrogen exchange occurs, affording a 2-acetyl pyrrole ring, which was also detected in the biocrude from chitin HTL.…”

Section: Resultsmentioning

confidence: 99%

Biocrude Production from Fast and Isothermal Hydrothermal Liquefaction of Chitin

Gollakota

Savage

2019

Energy Fuels

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We conducted isothermal and fast hydrothermal liquefaction (HTL) of chitin and determined the effects of temperature, holding time, and chitin wt % loading on product fraction yields and biocrude quality. Increasing the chitin loading from 1 to 15 wt % during isothermal HTL at 350 °C decreased the biocrude yield from 22 wt % to 10 wt %, increased the solids yield from 4 wt % to 16 wt %, and increased the nitrogen content in the biocrude. Increasing the chitin loading during fast HTL at a 500 °C set point temperature for 1 min, however, resulted in little variation in the biocrude and solids yields but again increased the nitrogen content. Fast HTL at this condition resulted in higher biocrude yields and higher energy recovery than did isothermal HTL under all tested chitin loadings. Fast HTL provides the opportunity to process chitin at high loadings (15 wt %) and achieve the highest available biocrude yields and energy recovery in the biocrude. Thermogravimetric analysis indicated a higher fraction of heavy components in the biocrude from isothermal HTL of chitin than from fast HTL. Ketones were abundant in the biocrude from isothermal HTL, and the biocrude from fast HTL was rich in nitrogen-containing compounds.

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Section: Resultsmentioning

confidence: 99%

Biocrude Production from Fast and Isothermal Hydrothermal Liquefaction of Chitin

Gollakota

Savage

2019

Energy Fuels

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“…As a result, NAG will be the major oligomer product within a short reaction time whereas glucosamine will be obtained with prolonged reaction time. Thermal chemical methods such as pyrolysis or radiolysis were also employed to convert chitin/chitosan [44][45][46]. Volatile aromatic heterocyclic compounds such as pyrazines, pyridines, pyrroles and furans were produced.…”

Section: Earlier Studiesmentioning

confidence: 99%

Novel Catalytic Systems to Convert Chitin and Lignin into Valuable Chemicals

Chen

Yan

2014

Catal Surv Asia

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This review briefs the emerging strategies for the designing of catalysts and catalytic systems to upgrade waste biomass into value-added chemicals, with an emphasis on the efforts and advances in our group. The review covers the valorization of chitin and lignin materials, which are most abundant N-containing and the most abundant aromatic polymers, respectively. In the chitin part, we show case existing examples on chitin monomer and chitin transformation into renewable, N-containing chemicals. Oxidation, hydrolysis, dehydration reactions will be introduced. In lignin part we mainly introduce novel catalyst for lignin hydrogenolysis, in particular Ni based monometallic and bimetallic catalysts. The structure-activity correlations will be discussed in detail. We finally describe some of the undergoing works in the group and highlight a few potential directions worth investigation in the future.

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“…Pyrolysis or radiolysis of chitin/chitosan to produce volatile aromatic heterocyclic compounds such as pyrazines, pyridines, pyrroles and furans has been reported. [20][21][22] Nevertheless, these methods cannot achieve a selective degradation resulting in trace amounts of products. Hydrolysis of chitin by enzymes or concentrated acids affords NAG and oligomers, but this route suffers from low efficiency, environmental issues and limited product diversity.…”

Section: Introductionmentioning

confidence: 99%