Studying the kinetics of extraction treatment of rice husk when obtaining silicon carbide

Authors

DOI:

https://doi.org/10.15587/1729-4061.2020.195881

Keywords:

rice husk, extraction, cellulose, silicon carbide, speed constant, activation energy

Abstract

Silicon carbide is characterized by a wide range of beneficial electrophysical, anti-corrosion, and strength properties. A promising raw material for the synthesis of silicon carbide is the waste of rice production, which includes compounds of silicon and carbon-containing organic substances. The cheapness and availability of such raw materials necessitate the development of technologies to obtain silicon carbide from it. An important direction in silicon carbide synthesis technology is to obtain a high purity product. To remove impurities from rice husks, it is necessary to carry out its pre-extraction treatment. It has been established that the extraction treatment of rice husks with acid solution makes it possible to clean the raw materials from metal compounds and the excess amount of carbon-containing components. To remove impurities of metal compounds and the excess amount of carbon-containing compounds from rice husks, it has been proposed to perform the extraction with an aqueous solution of the mixture of 10 % sulfur and 15 % acetic acids. We have derived the time dependences of the degree of extraction of cellulose from rice husks. Two temporal sections of the process have been identified. It is shown that the extraction of cellulose from rice husks obeys a pseudo first-order reaction. We have calculated the constants of speed and activation energy in the course of extraction for the two time sections of the process. The activation energy of extraction over a first period is 10.75 kJ/mol; over a second period, the activation energy value is 26.10 kJ/mol. It has been established that an increase in the extraction temperature from 20 to 100 °C leads to a two-fold improvement in the process efficiency. It is shown that silicon carbide, synthesized from rice husk after its extraction treatment, is a pure crystalline material whose particles’ size is from 1 to 20 micrometers

Author Biographies

Anna Liashenko, Ukrainian State University of Chemical Technology Gagarina ave., 8, Dnipro, Ukraine, 49005

Assistant

Department of Processes, Apparatus and General Chemical Technology

Yuri Sknar, Ukrainian State University of Chemical Technology Gagarina ave., 8, Dnipro, Ukraine, 49005

Doctor of Chemical Sciences, Professor

Department of Processes, Apparatus and General Chemical Technology

Tatyana Hrydnieva, Ukrainian State University of Chemical Technology Gagarina ave., 8, Dnipro, Ukraine, 49005

PhD, Senior Lecturer

Department of Processes, Apparatus and General Chemical Technology

Pavel Riabik, Ukrainian State University of Chemical Technology Gagarina ave., 8, Dnipro, Ukraine, 49005

PhD, Associate Professor

Department of Processes, Apparatus and General Chemical Technology

Oksana Demchyshyna, Kryvyi Rih National University Vitaliya Matusevycha str., 11, Kryvyi Rih, Ukraine, 50027

PhD, Assistant

Department of Mineral Processing and Chemistry

Kateryna Plyasovskaya, Oles Honchar Dnipro National University Gagarina ave., 72, Dnipro, Ukraine, 49010

PhD, Associate Professor

Department of Physical and Inorganic Chemistry

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Published

2020-02-29

How to Cite

Liashenko, A., Sknar, Y., Hrydnieva, T., Riabik, P., Demchyshyna, O., & Plyasovskaya, K. (2020). Studying the kinetics of extraction treatment of rice husk when obtaining silicon carbide. Eastern-European Journal of Enterprise Technologies, 1(6 (103), 25–31. https://doi.org/10.15587/1729-4061.2020.195881

Issue

Vol. 1 No. 6 (103) (2020): Technology organic and inorganic substances

Section

Technology organic and inorganic substances

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Copyright (c) 2020 Anna Liashenko, Yuri Sknar, Tatyana Hrydnieva, Pavel Riabik, Oksana Demchyshyna, Kateryna Plyasovskaya

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