Direct thermochemical liquefaction of microcrystalline cellulose by sub- and supercritical organic solvents

Anton Koriakin, Hai Van Nguyen, Doo Wook Kim, Chang-Ha Lee

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Direct thermochemical liquefaction of microcrystalline cellulose was carried out using sub- and supercritical solvents in a batch reactor. The decomposition efficiency of dodecane and m-xylene widely used in petrochemical industries was compared to that of methanol and 1,4-dioxane. At 400 °C, the conversion in methanol was the highest (92 wt% including gaseous products), but the operating pressure was too high. m-Xylene at the same temperature showed the conversion of 71.5 wt% with a lower number of products and milder pressure. Hydrogen contributed to the increase of the total conversion by 3-8% in m-xylene and methanol, compared with the results without adding any additional gas or with nitrogen pressurization. An acid-modified silica catalyst led to a significant increase of conversion in the supercritical methanol, but its effect was negligible in the aprotic solvents. The product compounds and property of solid residue depended on the supercritical solvents applied. The thermal-treated char after liquefaction in m-xylene, dodecane and 1,4-dioxane was an effective adsorbent for CO2 adsorption, showing the level comparable with activated carbons.

Original languageEnglish
Pages (from-to)175-186
Number of pages12
JournalJournal of Supercritical Fluids
Volume95
DOIs
Publication statusPublished - 2014 Jan 1

Fingerprint

liquefaction
xylene
Liquefaction
Xylene
cellulose
Organic solvents
Methanol
Cellulose
methyl alcohol
products
Pressurization
Batch reactors
activated carbon
adsorbents
Petrochemicals
Silicon Dioxide
Activated carbon
Adsorbents
Hydrogen
Nitrogen

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Chemical Engineering(all)
  • Condensed Matter Physics

Cite this

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abstract = "Direct thermochemical liquefaction of microcrystalline cellulose was carried out using sub- and supercritical solvents in a batch reactor. The decomposition efficiency of dodecane and m-xylene widely used in petrochemical industries was compared to that of methanol and 1,4-dioxane. At 400 °C, the conversion in methanol was the highest (92 wt{\%} including gaseous products), but the operating pressure was too high. m-Xylene at the same temperature showed the conversion of 71.5 wt{\%} with a lower number of products and milder pressure. Hydrogen contributed to the increase of the total conversion by 3-8{\%} in m-xylene and methanol, compared with the results without adding any additional gas or with nitrogen pressurization. An acid-modified silica catalyst led to a significant increase of conversion in the supercritical methanol, but its effect was negligible in the aprotic solvents. The product compounds and property of solid residue depended on the supercritical solvents applied. The thermal-treated char after liquefaction in m-xylene, dodecane and 1,4-dioxane was an effective adsorbent for CO2 adsorption, showing the level comparable with activated carbons.",
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Direct thermochemical liquefaction of microcrystalline cellulose by sub- and supercritical organic solvents. / Koriakin, Anton; Van Nguyen, Hai; Kim, Doo Wook; Lee, Chang-Ha.

In: Journal of Supercritical Fluids, Vol. 95, 01.01.2014, p. 175-186.

Research output: Contribution to journalArticle

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AB - Direct thermochemical liquefaction of microcrystalline cellulose was carried out using sub- and supercritical solvents in a batch reactor. The decomposition efficiency of dodecane and m-xylene widely used in petrochemical industries was compared to that of methanol and 1,4-dioxane. At 400 °C, the conversion in methanol was the highest (92 wt% including gaseous products), but the operating pressure was too high. m-Xylene at the same temperature showed the conversion of 71.5 wt% with a lower number of products and milder pressure. Hydrogen contributed to the increase of the total conversion by 3-8% in m-xylene and methanol, compared with the results without adding any additional gas or with nitrogen pressurization. An acid-modified silica catalyst led to a significant increase of conversion in the supercritical methanol, but its effect was negligible in the aprotic solvents. The product compounds and property of solid residue depended on the supercritical solvents applied. The thermal-treated char after liquefaction in m-xylene, dodecane and 1,4-dioxane was an effective adsorbent for CO2 adsorption, showing the level comparable with activated carbons.

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