Extraction of cellulose from rice straw by microwave irradiation
Appazov N.O. Espanova I.D. Niyazova D.Zh. Moldanazar A.A. Zhapparbergenov R.U. Turmanov R.A. Toibazarova A.B. Appaz A.N. Syzdykbayev M.I.
2025Bulgarska Akademiya na Naukite
Bulgarian Chemical Communications
2025#57Issue 114 - 19 pp.
This article examines the process of converting large volumes of agricultural waste - rice straw - into cellulose which can be used for paper products manufacturing. The process of rice straw delignification is carried out using microwave irradiation at power levels of 100 and 180 W for 5-40 min with a sodium hydroxide solution. The delignification of the obtained product is also performed under microwave irradiation at power levels of 100 and 180 W for 5-40 min, using a mixture of acetic acid and hydrogen peroxide at a 1:1 ratio in the presence of ammonium molybdate (0-5 wt.% of cellulose mass). Concentrated sodium hypochlorite solution is used for bleaching of the obtained mass. The yield of the target product, cellulose, is 42.7-70.3 wt.%. The optimal product is cellulose obtained after delignification using a mixture of acetic acid and hydrogen peroxide in a 1:1 ratio under microwave irradiation with a power of 180 W for 15 min in the presence of ammonium molybdate (5% of the cellulose mass) and without using sodium hypochlorite. In this case, the content of alpha-cellulose in the final product is 74.45 wt.%, corresponding to Grade A2 (cellulose used for the production of white office paper). The obtained results have potential application in paper products manufacturing.
cellulose , microwave irradiation , paper products , rice straw
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Korkyt Ata Kyzylorda University, 29A Ayteke bi Str., Kyzylorda, Kazakhstan
Limited Liability Partnership «CNEC», Dariger Ali Str., Kyzylorda, Kazakhstan
Limited Liability Partnership «KazEcoChem», 12 D. Konaev Str., Astana, Kazakhstan
Limited Liability Partnership «DPS-Kyzylorda», 112A Amangeldi Str., Kyzylorda, Kazakhstan
Nazarbayev Intellectual School Chemical-Biological Direction in Kyzylorda, 6 Sultan Beybars Str., Kyzylorda, Kazakhstan
Korkyt Ata Kyzylorda University
Limited Liability Partnership «CNEC»
Limited Liability Partnership «KazEcoChem»
Limited Liability Partnership «DPS-Kyzylorda»
Nazarbayev Intellectual School Chemical-Biological Direction in Kyzylorda
10 лет помогаем публиковать статьи Международный издатель
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