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Conversion of natural polymers to monocyclic compoundsтезисы доклада Тезисы
- Авторы: Ponomarev A.V., Kholodkova E.M., Pavlov Yu S., Skiba S.A.
- Сборник: International Conference on Development and Applications of Nuclear Technologies NUTECH - 2017. Book of Abstracts. Kraków, 10-13 September 2017
- Тезисы
- Год издания: 2017
- Место издания: AGH University of Science and Technology Faculty of Science and Applied Computer Science Kraków
- Первая страница: 39
- Последняя страница: 39
- Аннотация: Natural polysaccharides (cellulose and chitin) and polyphenols (lignin), being the most widespread renewable materials, represent rather tempting feedstocks to obtain valuable chemicals. In the course of conversion the moderate fragmentation resulting in monocyclic products such as furans, phenols, benzenediols and pyridines would be rather desirable. However conventional processing technologies give few such products or are multistage and thereby expensive. High-temperature radiolysis could serve as more proper way to form monocyclic organic products. Irradiation of natural polymers results in formation of high-molecular cation-radicals and macroradicals which possess low thermal stability. The moderate fragmentation of radical intermediates occurs at temperatures below a threshold of pyrolysis initiation. As a rule, primary cleavage of chemical bonds takes place between macromolecule base units. As a result of removal of a monocyclic fragment the residual macromolecule remains in the form of a radical that provides possibility of its further fragmentation via the chain mechanism. Main products of pyrolysis are lightest fragments (CO, СО2, Н2О, СН4) together with the heavy charred residue. In turn, radiolysis provides higher yield of monomeric derivatives such as furans (from cellulose), vanilloids, monoatomic and dihydric phenols (from lignin), and pyridines (from chitin). Accordingly, high-temperature radiolysis of lignin possesses the important advantages over pyrolysis. The report describes a technique of biopolymers conversion to monocyclic compounds and the mechanism of the radiation-thermal transformations.
- Добавил в систему: Павлов Юрий Сергеевич
Прикрепленные файлы
| № | Имя | Описание | Имя файла | Размер | Добавлен |
|---|---|---|---|---|---|
| 1. | Полный текст | International Conference on Development and Applications of Nuclear Technologies NUTECH - 2017. AGH Kraków, 10-13 September 2017. Book of Abstracts. | book_of_abstract.pdf | 2,1 МБ | 3 марта 2018 [PavlovUS] |