Сибирский федеральный университет

Перевод названия: POSSIBILITY AND PROSPECTS TO CREATE NEW TECHNOLOGY OF WOOD PROCESSING INTO FINE CHEMICALS

Тип публикации: доклад, тезисы доклада, статья из сборника материалов конференций

Конференция: VI Международного симпозиума имени Б.Н. Уголева, посвященного 50-летию Регионального Координационного совета по современным проблемам древесиноведения; Красноярск; Красноярск

Год издания: 2018

Аннотация: The communication discusses principal patterns that govern the processes of lignin (one of the main wood compoment) catalytic oxidation into vanillin (3-methoxy-4-hydroxybenzaldehyde) and syringaldehyde (3,5-dimethoxy-4-hydroxybenzaldehyde). It examines the influence of lignin and oxidant nature, temperature, mass transfer, and of other factors on the yield of the aldehydes and the process selectivity. The review reveals that properly organized processes of catalytic oxidation of various lignins are only insignificantly (10-15 %) inferior to oxidation by nitrobenzene in terms of yield and selectivity in vanillin and syringaldehyde. Very high consumption of oxygen (and consequentially, of alkali) in the process - over 10 mol per mol of obtained vanillin - is highlighted as an unresolved and unexplored problem: scientific literature reveals almost no studies devoted to the possibilities of decreasing the consumption of oxygen and alkali. Different hypotheses about the mechanism of lignin oxidation into the aromatic aldehydes are discussed, and the mechanism comprising the steps of single-electron oxidation of phenolate anions, and ending with retroaldol cleavage of a substituted coniferyl aldehyde was pointed out as the most convincing one. The possibility and development prospects of single-stage oxidative processing of wood into the aromatic aldehydes and cellulose are analyzed. The examined data demonstrate economic viability of comprehensive wood processing into vanillin, syringaldehyde, 3,4,5-trimethoxybenzaldehyde, and products of subsequent conversion of hemicelluloses and cellulose (e.g., levulinic acid and furfural). A discussion is offered about the prospects of superseding the current industrial synthesis of vanillin (based on fossil-derived guaiacol and glyoxylic acid) by a technology based on renewable plant resources conversion.

Журнал: СТРОЕНИЕ, СВОЙСТВА И КАЧЕСТВО ДРЕВЕСИНЫ - 2018

Номера страниц: 192-196

Издатель: Издательство Сибирского отделения РАН

• Тарабанько Валерий Евгеньевич (Институт химии и химической технологии СО РАН)
• Кайгородов Константин Леонидович (Институт химии и химической технологии СО РАН)

• РИНЦ (eLIBRARY.RU)