OBTAINING OF MICROCRYSTALLINE CELLULOSE FROM PLANT MATERIAL
The process of obtaining microcrystalline cellulose from fibers of technical and stalks of cereal plants (hemp, flax, kenaf, corn, wheat and miscanthus) with using of soda cooking, acid treatment, bleaching and hydrolysis were investigated. It was founded that soda cooking to help reducing the resid...
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| Format: | Article |
| Language: | English |
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Igor Sikorsky Kyiv Polytechnic Institute
2015-11-01
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| Series: | Вісник Національного технічного університету України «Київський політехнічний інститут імені Ігоря Сікорського»: Серія «Хімічна інженерія, екологія та ресурсозбереження» |
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| Online Access: | http://chemengine.kpi.ua/article/view/52322 |
| Summary: | The process of obtaining microcrystalline cellulose from fibers of technical and stalks of cereal plants (hemp, flax, kenaf, corn, wheat and miscanthus) with using of soda cooking, acid treatment, bleaching and hydrolysis were investigated. It was founded that soda cooking to help reducing the residual lignin content in industrial fibers plants from 4,6 to 12,4 % and for stalks of cereal plants from 13.4 to 20.9 % and mineral substances for fibers of industrial plants from 1,2 to 2,7 % and for stalks of cereal plants from 4,26 to 5.1 % compared to the feedstock. Acid treatment provides reduction of residual lignin for fibers of industrial plants from 0,16 to 0,65 % and for stems of cereal plants from 0,77 to 1.14 % and mineral substances for fibers of industrial plants from 0,17 to 0,29 % and for stalks of cereal plants from 0,46 to1,6 % while preserving the high yield pulp. Process of pulp bleaching without the using of harmful containing chlorine substances by using as reagent hydrogen peroxide bleaching was carried out to reduce the load on the environment and to provide the necessary whiteness of pulp. Trilon B was used as reagent at the chelating stage of cellulose to convert of variable valence cations into solution and stabilization of hydrogen peroxide. Trilon B consumption was 10 % to the mass of absolutely dry material.
It was established that the use of hydrochloric acid concentration of 0.5 % for the technical fibers and 1.0% for the stems of cereals plants on the stage hydrolysis provides obtaining of microcrystalline cellulose in powder form with a degree of polymerization ranging from 152 to 193. The proposed resource recycling technology of processing of technical fibers and stems of cereals plants allows obtaining of microcrystalline cellulose, which for all quality indicators meet the technical requirements and can be used in the chemical industry in the manufacture of plastics and adsorbents, and the manufacture of face masks.
Кeywords: plant material; soda cooking; bleaching; hydrolysis; microcrystalline cellulose |
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| ISSN: | 2617-9741 2664-1763 |