The Nature and Mechanism of Selectivity Decrease of the Acid-catalyzed Fructose Conversion with Increasing the Carbohydrate Concentration | Научно-инновационный портал СФУ

The Nature and Mechanism of Selectivity Decrease of the Acid-catalyzed Fructose Conversion with Increasing the Carbohydrate Concentration

Тип публикации: статья из журнала

Год издания: 2015

Ключевые слова: carbohydrates, fructose, glucose, homogeneous catalysis, levulinic acid, 5-hydroxymethylfurfural, selectivity

Аннотация: To understand the effect of decreasing the process selectivity with increasing the carbohydrate concentration, the influence of levulinic acid and glucose additions on the fructose acid-catalyzed conversion was studied. Levulinic acid yield significantly decreases by initial addition of levulinic acid and glucose to the reaction mixture. Humins were found to include structural fragments of levulinic acid, carbohydrates, and 5-hydroxymetylfurfural. According to the mechanism suggested, the carbocation formed from fructose interacts with water producing target products (5-HA/IF and levulinic acid) or with levulinic acid or another carbohydrate molecules giving humins. In these assumptions the levulinic acid formation in the process is a reaction of first order with respect to substrate concentration, and the humic substance formation is a reaction of second order with respect to the initial carbohydrate concentration. These two process characteristics, water to substrate ratio and the reaction orders distinction, are the reasons of decreasing the carbohydrate conversion selectivity with increasing the substrate concentration.

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Издание

Журнал: JOURNAL OF SIBERIAN FEDERAL UNIVERSITY-CHEMISTRY

Выпуск журнала: Vol. 8, Is. 1

Номера страниц: 6-18

ISSN журнала: 19982836

Место издания: KRASNOYARSK

Издатель: SIBERIAN FEDERAL UNIV

Авторы

  • Tarabanko Valery E. (SB RAS, Inst Chem & Chem Technol, 50-24 Akademgorodok, Krasnoyarsk 660036, Russia; Siberian Fed Univ, Krasnoyarsk 660041, Russia)
  • Smirnova Marina A. (SB RAS, Inst Chem & Chem Technol, 50-24 Akademgorodok, Krasnoyarsk 660036, Russia)
  • Chernyak Mikhail Yu (SB RAS, Inst Chem & Chem Technol, 50-24 Akademgorodok, Krasnoyarsk 660036, Russia)
  • Kondrasenko Alexander A. (SB RAS, Inst Chem & Chem Technol, 50-24 Akademgorodok, Krasnoyarsk 660036, Russia)
  • Tarabanko Nikolay (SB RAS, Inst Chem & Chem Technol, 50-24 Akademgorodok, Krasnoyarsk 660036, Russia)

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