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  5. INTEGRATED PROCESSING OF WASTE FROM RICE PRODUCTION WITH THE SIMULTANEOUS PRODUCTION OF SILICON DIOXIDE, LIGNIN AND CELLULOSE

INTEGRATED PROCESSING OF WASTE FROM RICE PRODUCTION WITH THE SIMULTANEOUS PRODUCTION OF SILICON DIOXIDE, LIGNIN AND CELLULOSE

DOI

10.24411/1728-323X-2019-12005

Section

Ecology

Title

INTEGRATED PROCESSING OF WASTE FROM RICE PRODUCTION WITH THE SIMULTANEOUS PRODUCTION OF SILICON DIOXIDE, LIGNIN AND CELLULOSE

Сontributors
  1. Nghia N. H. Postgraduate student of the Department of Technology of Synthetic Rubber. Institute of Polymers.
  2. Kazan National Research Technological University. Е-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.. Kazan. Russia.
  3. Zenitova L. A. Professor, Ph. D. (Engineering), Dr. Habil., Head of the Department of Synthetic Rubber Technology.
  4. Institute of Polymers. Kazan National Research Technological University. Е-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.. Kazan. Russia.
  5. Dien L. Q. Associate Professor, Head of the Department of Cellulose and paper. Institute of Chemical Engineering.
  6. Hanoi University of Technology. E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.. Ha Noi, Viet Nam.
Abstract

Rice husk is a waste of rice production. Currently, in some Asian countries, including Vietnam, the processing of rice husks by burning or uncontrolled dumping creates the risk of environmental pollution. This article proposes the process of extracting useful ingredients from rice husks in order to turn rice husks from agricultural waste into renewable raw materials. To dissolve the components of silicon dioxide and lignin in rice husks, alkaline cooking is carried out in a 17.5 % NaOH solution with a rice husk: alkaline solution ratio of 1:10, the cooking time is 2.5 hours at a temperature of 100 °C. Dissolved silica and lignin are precipitated with 15 % H2SO4. The yield of silicon dioxide is 11 % of the mass of the starting material, with a recovery efficiency of 64 %. The studies of the characteristics of silicon dioxide by X-ray diffraction and electron microscopy showed that silica particles are nanometer-sized, contain 49.8 % silicon, 47.4 % oxygen and a small amount of impurities. The amount of lignin produced is 5.8 % of the starting material weight, the efficiency of lignin extraction reaches 17.4 %. The amount of cellulose is 66.7 % of the starting material weight, the extraction efficiency of cellulose is 91.4 %.

Keywords

rice husk, silicon dioxide, lignin, cellulose.

References
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