Polysaccharide Hydrolysis and Metallic Impurities Removal Behavior of Rice Husks in Citric Acid Leaching Treatment

Umeda, Junko; Imai, Hisashi; Kondoh, Katsuyoshi

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タイトル	Polysaccharide Hydrolysis and Metallic Impurities Removal Behavior of Rice Husks in Citric Acid Leaching Treatment
著者	Umeda, Junko Umeda, Junko
	Imai, Hisashi Imai, Hisashi
	Kondoh, Katsuyoshi Kondoh, Katsuyoshi
キーワード等	rice husk
	silica
	hydrolysis
	polysaccharide
	monosaccharide
	metallic impurity
抄録	Rice husk is one of the representative non-eatable biomasses, and contains 70～75 mass% organics such as cellulose and hemi-cellulose and 15～20 mass% silica (SiO₂) elements. From a viewpoint of the wide use of the biomass energy, its cost reduction is strongly required by selecting suitable raw materials as biomass fuels and optimizing the operating conditions. In the present study, rice husk was selected as input raw fuel materials because after extracting the above organics as the biomass energy from rice husks, their residues consisting of high-purity amorphous silica would be an industrial resource with added value, and resulted in the total cost reduction of the biomass energy. For high-purification of silica materials originating in rice husk residues, the citric acid leaching treatment and the following water rinsing process of rice husks were used to remove metallic impurities such as Na, K, Ca, Mg, Fe, Cu, etc. In this study, the optimization of the operating parameters such as the concentration and temperature of citric acid solution, the stirring time in the acid leaching and water rinsing treatment, and combustion temperature were examined out for the removal of metallic impurities and the hydrolysis reaction of the polysaccharides. XRF and ICP analysis were used to quantitatively evaluate the residual content of impurities and carbon elements. GC-MS and FT-IR analysis of rice husks after leaching were conducted to examine their hydrolysis behavior.
公開者	大阪大学接合科学研究所
公開者の別表記	Joining and Welding Research Institute, Osaka University
公開者 (ヨミ)	オオサカダイガクセツゴウカガクケンキュウジョ
掲載誌名	Transactions of JWRI
巻	38
号	2
開始ページ	13
終了ページ	18
刊行年月	2009-12
ISSN	03874508
NCID	AA00867058
URL	http://hdl.handle.net/11094/11504
言語	英語
カテゴリ	紀要論文 Departmental Bulletin Paper
カテゴリ	Transactions of JWRI / Vol.38 No.2 (2009-12)

著者版フラグ	publisher
NII資源タイプ	紀要論文
ローカル資源タイプ	紀要論文
dcmi資源タイプ	text
DCTERMS.bibliographicCitation	Transactions of JWRI.38(2) P.13-P.18
DC.title	Polysaccharide Hydrolysis and Metallic Impurities Removal Behavior of Rice Husks in Citric Acid Leaching Treatment
DC.creator	Umeda, Junko
	Imai, Hisashi
	Kondoh, Katsuyoshi
DC.publisher	大阪大学接合科学研究所
DC.language" scheme="DCTERMS.RFC1766	英語
DCTERMS.issued" scheme="DCTERMS.W3CDTF	2009-12
DC.identifier" scheme="DCTERMS.URI	http://hdl.handle.net/11094/11504
DC.subject	rice husk
	silica
	hydrolysis
	polysaccharide
	monosaccharide
	metallic impurity
DCTERMS.abstract	Rice husk is one of the representative non-eatable biomasses, and contains 70～75 mass% organics such as cellulose and hemi-cellulose and 15～20 mass% silica (SiO₂) elements. From a viewpoint of the wide use of the biomass energy, its cost reduction is strongly required by selecting suitable raw materials as biomass fuels and optimizing the operating conditions. In the present study, rice husk was selected as input raw fuel materials because after extracting the above organics as the biomass energy from rice husks, their residues consisting of high-purity amorphous silica would be an industrial resource with added value, and resulted in the total cost reduction of the biomass energy. For high-purification of silica materials originating in rice husk residues, the citric acid leaching treatment and the following water rinsing process of rice husks were used to remove metallic impurities such as Na, K, Ca, Mg, Fe, Cu, etc. In this study, the optimization of the operating parameters such as the concentration and temperature of citric acid solution, the stirring time in the acid leaching and water rinsing treatment, and combustion temperature were examined out for the removal of metallic impurities and the hydrolysis reaction of the polysaccharides. XRF and ICP analysis were used to quantitatively evaluate the residual content of impurities and carbon elements. GC-MS and FT-IR analysis of rice husks after leaching were conducted to examine their hydrolysis behavior.
citation_title	Polysaccharide Hydrolysis and Metallic Impurities Removal Behavior of Rice Husks in Citric Acid Leaching Treatment
citation_author	Umeda, Junko
	Imai, Hisashi
	Kondoh, Katsuyoshi
citation_publisher	大阪大学接合科学研究所
citation_language	英語
citation_date	2009-12
citation_journal_title	Transactions of JWRI
citation_volume	38
citation_issue	2
citation_firstpage	13
citation_lastpage	18
citation_issn	03874508
citation_public_url	http://hdl.handle.net/11094/11504
citation_keywords	rice husk
	silica
	hydrolysis
	polysaccharide
	monosaccharide
	metallic impurity

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