Solvent-free Synthesis of Cellulose Acetate by Solid Superacid Catalysis

Liu, Yan; Wan, Li; Qi, Zhonghui; Liu, Shaoyang

doi:10.1007/s10965-006-9054-x

Cited by 27 publications

(12 citation statements)

References 16 publications

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“…membrane [6]. Some other production methods were promoted for polysaccharide esterification, consisting of the use of ionic liquid [7], super acids [8], iminium chlorides and ring opening esterification [9]. Another recent investigation is the iodine application of the starch and cellulose esterification in the presence of acetic anhydride for catalyst [5,10].…”

Section: Introductionmentioning

confidence: 99%

Production of Acetyl Cellulose from Agricultural Waste of Oil Palm Empty Fruit Bunches

et al. 2019

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In Indonesia especially in Lampung Province, there are a lot of oil palm empty fruit bunches (OPEFB) as an organic material waste. OPEFB is relatively inexpensive lignocellulose material as raw material of cellulose acetate or acetyl cellulose. In a business to bigger added value out of these natural renewable materials, the production of the acetyl cellulose was performed well by the acetylation of cellulose from OPEFB using different methods. These were extensively characterized using thermogravimetric analysis, Fourier transform infrared spectroscopy and X-ray diffraction. The results indicated that the acetyl cellulose resulted showed similar properties to cotton acetyl cellulose. Degree of substitution of the resultant acetyl cellulose from different methods was improved from 1.86 to 2.60.

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Section: Introductionmentioning

confidence: 99%

Production of Acetyl Cellulose from Agricultural Waste of Oil Palm Empty Fruit Bunches

et al. 2019

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“…Recentemente vários outros métodos têm sido estudados com o intuito de substituir o uso de ácido sulfúrico como catalisador [13] . Esses estudos envolvem a utilização de líquidos iônicos [14] , superácidos, tais como zircônia sulfatada [15] , e iodo [16] . Dentro desse contexto, alguns trabalhos também têm mostrado a utilização de N-bromossuccinimida (NBS) com sucesso na modificação química de materiais lignocelulósicos oriundos de resíduos agroindustriais [17][18][19] .…”

Section: Introductionunclassified

Síntese de acetato de celulose a partir da palha de feijão utilizando N-bromossuccinimida (NBS) como catalisador

Brum¹,

Oliveira²,

Bianchi³

et al. 2012

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Resumo: Neste estudo a celulose obtida da palha de feijão foi utilizada para produzir um material hidrofóbico (acetato de celulose) para ser avaliado como absorvente de óleo. Nas reações de acetilação foram utilizados anidrido acético e dois catalisadores, a piridina (PY) e N-bromossuccinimida (NBS). Os materiais produzidos foram caracterizados por espectroscopia na região do infravermelho médio, microscopia eletrônica de varredura, difratometria de raios-X e análise elementar. O NBS mostrou-se mais eficiente que a PY e, seu uso resultou em materiais com maiores quantidades de grupos acetatos, mais hidrofóbicos e com maiores capacidades de absorção de óleo de soja. Palavras-chave: Acetato de celulose, N-bromosuccinimida, acetilação, absorção de óleo.Abstract: In this work, cellulose from beans straw was used to produce a more hydrophobic material (cellulose acetate) for use as oil absorbent. Acetic anhydride was used in the reactions with two catalysts, pyridine (PY) and N-bromosuccinimide (NBS). The materials produced were characterized by infrared spectroscopy, scanning electron microscopy, X-ray diffraction and elemental analysis. NBS proved more efficient than PY, with the resulting materials containing higher number of acetate groups, being more hydrophobic and with higher capacity to absorb soybean oil.

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“…The triacetate is then partially hydrolyzed to the desired degree of substitution (DS). Recently several other synthetic methods have been developed for polysaccharide esterification, including the use of ionic liquids (Wu et al, 2004), superacids (Yan, Li, Qi, & Liu, 2006), and reactions involving dialkylcarbodiimide, N,N-carbonyldiimidazole, iminium chlorides, transesterification, and ring-opening esterification (Heinze, Liebert, & Koschella, 2006). Another recent development is the use of iodine as a catalyst for the esterification of cellulose and starch in the presence of acetic anhydride (Biswas, Shogren, & Willett, 2005;Biswas et al, 2007Biswas et al, , 2009.…”

Section: Introductionmentioning

confidence: 99%